Stiebel Eltron · An established brand in the UK. 634 codes across 5 product families, each taken from the manufacturer’s manuals. Stiebel Eltron technical support ↗
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634 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| 01 | Anode | Partly | Yes |
| 02 | The high limit safety cut-out has tripped: The electric emergency/booster heater has overheated and was stopped by the high limit safety cut-out. | Yes | Yes |
| 03 | High pressure switch: The high pressure switch has responded five times within a compressor runtime of two hours. The heat pump will shut down. | Yes | Yes |
| 04 | Low pressure switch: The low pressure switch has responded five times in five hours. The heat pump will shut down. | Yes | Yes |
| 05 | Extract air fan: The fan is blocked. | Yes | Yes |
| 06 | Supply air fan: The fan is blocked. | Yes | Yes |
| 07 | Exhaust air fan: The fan is blocked. The heat pump will be locked out. | Yes | Yes |
| 08 | Hot gas max.: The compressor was shut down for safety reasons. | Yes | Yes |
| 09 | EVE min.: The heat pump will shut down. | Yes | Yes |
| 10 | Flow max: Heat generators are disabled until the flow temperature has fallen; enabled heat generator cycles on and off. | Partly | Yes |
| 11 | Low pressure sensor: The low pressure sensor does not deliver a plausible signal (< 2 mA for longer than 10 s). The heat pump is blocked in cooling mode. | Partly | Yes |
| 12 | High pressure sensor: The high pressure sensor does not deliver a plausible signal (< 2 mA for longer than 10 s). | Partly | Yes |
| 13 | EVE refrigerant shortage: The 'Refrigerant shortage' limiter has triggered five times in five hours. The heat pump will shut down. | Yes | Yes |
| 14 | EVE Ex valve will not close | Partly | Yes |
| 15 | DHW temperature: DHW heating blocked until 22:00 h if set DHW temperature not reached within 'MAX DHW HTG DUR.'; retried, then blocked until 22:00 next day. | Yes | Yes |
| 16 | Inverter communication fault | Partly | Yes |
| 17 | Defrost time exceeded: The evaporator is not defrosted within the defined period; after ten successive occurrences the heat pump is blocked. | Yes | Yes |
| 18 | Heating circuit pressure sensor: The heating circuit pressure sensor is not providing a plausible signal. | Partly | Yes |
| 19 | Defrost duration of cross-countercurrent heat exchanger: Defrosting not completed after the defined time; fault displayed until defrost completes. | Partly | Yes |
| 20 | Solar sensor: The solar circuit pump is not being switched. | Partly | Yes |
| 21 | Outside temperature sensor: The heating system runs constantly with the flow temperature for manual mode. | Partly | Yes |
| 22 | Hot gas temperature sensor: The compressor is switched off at outside temperatures < -10 °C and condenser temperatures > 40 °C. | Yes | Yes |
| 23 | Condenser temperature sensor: The compressor is stopped. | Yes | Yes |
| 24 | Evaporator temperature sensor: The compressor is stopped. | Yes | Yes |
| 25 | Compressor inlet temperature: Cooling mode is blocked. | Varies by model | Yes |
| 26 | Return temperature sensor in heating circuit: Heating switches to flow-temperature control; solar heat amount cannot be calculated. | Partly | Yes |
| 27 | Evaporator output temperature: Evaporator control of the heat pump is disabled. | Partly | Yes |
| 28 | Flow temperature sensor in heating circuit: Heating switches to return-temperature control; booster heater output cannot be calculated. | Partly | Yes |
| 29 | DHW temperature sensor: DHW heating is blocked. | Varies by model | Yes |
| 30 | Software version | Partly | Yes |
| 31 | RAM | Partly | Yes |
| 32 | EEProm | Partly | Yes |
| 33 | Extract air humidity sensor | Partly | Yes |
| 34 | Flow sensor: Flow (rate) sensor fault. | Not stated | Yes |
| 35 | Min. flow, cooling: Refrigerant inlet pressure below threshold during cooling; heat pump locked out, restarts after idle period if temperature rises. | Yes | Yes |
| 36 | Min. flow rate: For 2 hours the flow rate has been < 5 l/min; electric emergency/booster heater blocked. | Yes | Yes |
| 37 | Min. water pressure: Heating overpressure below 0.05 MPa (0.5 bar) and minimum flow rate not achieved; electric emergency/booster heater blocked. | Varies by model | Yes |
| 40 | Float switch, bottom panel: The heat pump and the ventilation are switched off. | Yes | Yes |
| 42 | Excess temperature, compressor: The heat pump remains off. | Yes | Yes |
| 43 | Low pressure too low: The compressor is switched off for several minutes. | Yes | Yes |
| 44 | Low pressure too high: The compressor is switched off for several minutes. | Yes | Yes |
| 45 | Low pressure not assigned: The compressor is switched off for several minutes. | Yes | Yes |
| 46 | High pressure too low: The compressor is switched off for several minutes. | Yes | Yes |
| 47 | High pressure too high: The compressor is switched off for several minutes. | Yes | Yes |
| 48 | High pressure not assigned: The compressor is switched off for several minutes. | Yes | Yes |
| 50 | Sensor on heat pump return: Control continues; solar and compressor heat amounts cannot be calculated. | No | Yes |
| 51 | Sensor on heat pump flow: Control continues; compressor heat and booster heater output cannot be calculated. | No | Yes |
| 52 | Sensor on condenser outlet: Control continues despite this fault. | No | Yes |
| 53 | Extract air temperature sensor | Partly | Yes |
| 54 | Integral temperature sensor | Partly | Yes |
| 55 | Temperature sensor at the top of the cylinder | Partly | Yes |
| 56 | Sensor in the second DHW cylinder | Partly | Yes |
| 57 | Sensor to measure the oil sump temperature | Partly | Yes |
| 58 | Differential pressure sensor: The appliance only defrosts under time control or when triggered by the low pressure sensor; continues to run. | No | Yes |
| 59 | Differential pressure sensor, fan control | Partly | Yes |
| 60 | Inverter fault | Partly | Yes |
| 8167 | The heat pump type set with the rotary selector does not match the installed electronic assembly. | Yes | Yes |
| 8168 | 4-way diverter valve does not switch to cooling. | Yes | Yes |
| 8169 | 4-way diverter valve does not switch to heating. | Yes | Yes |
| 8170 | Internal inverter errors (IPM current sampling error, DC bus, AC input overcurrent, AC input voltage sampling error, DSP/PFC communication error, heat sink sensor fault, DSP/MCU communication error). | Yes | Yes |
| 8176 | Flow and return connections have been interchanged. | Yes | Yes |
| 8177 | Evaporator cannot dissipate enough heat in cooling mode. | Yes | Yes |
| 8181 | Multiple occurrence of fault ERR HD SENSOR. | Yes | Yes |
| 8182 | Multiple occurrence of fault ERR ND SENSOR. | Yes | Yes |
| 8183 | Multiple occurrence of fault SOA HD EXCEEDED. | Yes | Yes |
| 8184 | Multiple occurrence of fault MAX HOT GAS. | Yes | Yes |
| 8185 | Multiple occurrence of fault DEFROST or MIN FLOW COOL. | Yes | Yes |
| 8186 | Multiple occurrence of fault INV H INV EXCESS CURRENT. | Yes | Yes |
| 8188 | Multiple occurrence of fault 8168. | Yes | Yes |
| 8189 | Multiple occurrence of fault 8169. | Yes | Yes |
| 8191 | Multiple response of inverter overcurrent relay. | Yes | Yes |
| 8192 | Multiple occurrence of fault INV H PFC EXCESS CURRENT. | Yes | Yes |
| 8193 | Multiple occurrence of fault INV H INV EXCESS TEMP. | Yes | Yes |
| 8208 | Multiple response of high pressure switch at inverter. | Yes | Yes |
| 8255 | Major inverter fault: Input current limit | Yes | Yes |
| 8256 | Major inverter fault: Output current limit | Yes | Yes |
| 8257 | Major inverter fault: Phase loss | Yes | Yes |
| 8258 | Major inverter fault: Power module | Yes | Yes |
| 8259 | Major inverter fault: Mains voltage sensor | Yes | Yes |
| 8260 | Major inverter fault: Motor power offset | Yes | Yes |
| 8261 | Major inverter fault: PFC power offset | Yes | Yes |
| 8262 | Major inverter fault: Measure motor inductance | Yes | Yes |
| 8263 | Major inverter fault: Measure motor phase resistance | Yes | Yes |
| 8264 | Major inverter fault: Restart | Yes | Yes |
| 8265 | Major inverter fault: Motor excess current shutdown function | Yes | Yes |
| 8266 | Major inverter fault: IGBT US short circuit | Yes | Yes |
| 8267 | Major inverter fault: IGBT OS short circuit | Yes | Yes |
| 8268 | Major inverter fault: Motor phases short circuit | Yes | Yes |
| 8269 | Major inverter fault: SVM function | Yes | Yes |
| 8270 | Major inverter fault: Fan inverter excess current | Yes | Yes |
| 8271 | Major inverter fault: Fan SVM function | Yes | Yes |
| 8272 | Major inverter fault: Fan DC excess voltage | Yes | Yes |
| 8273 | Major inverter fault: Fan DC undervoltage | Yes | Yes |
| 8274 | Major inverter fault: Fan inverter excess temperature | Yes | Yes |
| 8275 | Major inverter fault: Fan rotor vector | Yes | Yes |
| 8276 | Major inverter fault: Fan motor excess speed | Yes | Yes |
| 8277 | Major inverter fault: Fan phase loss | Yes | Yes |
| 8278 | Major inverter fault: Fan power module | Yes | Yes |
| 8279 | Major inverter fault: Fan motor power offset | Yes | Yes |
| 8280 | Major inverter fault: Fan measure motor inductance | Yes | Yes |
| 8281 | Major inverter fault: Fan measure motor phase resistance | Yes | Yes |
| 8282 | Major inverter fault: Fan motor excess current shutdown function | Yes | Yes |
| 8283 | Major inverter fault: Fan IGBT US short circuit | Yes | Yes |
| 8284 | Major inverter fault: Fan IGBT OS short circuit | Yes | Yes |
| 8285 | Major inverter fault: Fan motor phases short circuit | Yes | Yes |
| 8286 | Minor inverter fault: Fan DC undervoltage | Yes | Yes |
| 8287 | Minor inverter fault: Fan Modbus faulty | Yes | Yes |
| 8288 | Minor inverter fault: Fan inverter low temperature | Yes | Yes |
| 8289 | Minor inverter fault: Fan intermediate circuit initialisation | Yes | Yes |
| 8290 | Minor inverter fault: Fan central fault 1 | Yes | Yes |
| 8291 | Low relevance communication objects have been incorrectly transferred repeatedly between the IWS and inverter (fan section). | Yes | Yes |
| 8292 | High relevance communication objects have been incorrectly transferred repeatedly between the IWS and inverter (fan section). | Yes | Yes |
| 8293 | ERR T VER EIN IWS: sensor value of the evaporator inlet temperature sensor outside the permissible range. | Yes | Yes |
| 8294 | Minor inverter fault: Fan mains undervoltage | Yes | Yes |
| 8295 | Minor inverter fault: Fan motor excess temperature | Yes | Yes |
| 8296 | Major inverter fault: PFC excess current shutdown function | Yes | Yes |
| 8297 | Minor inverter fault: Inverter temperature control | Yes | Yes |
| 8298 | Minor inverter fault: Input current control | Yes | Yes |
| 8299 | Major inverter fault: High pressure sensor range undershot | Yes | Yes |
| 8300 | Major inverter fault: Compressor type configuration | Yes | Yes |
| 8301 | Major inverter fault: High pressure sensor configuration | Yes | Yes |
| 10002 | Compressor or starting contactor stuck. | Yes | Yes |
| 10003 | The minimum low pressure limiter has been triggered. | Yes | Yes |
| 10004 | The high pressure switch has responded. | Yes | Yes |
| 10005 | The low pressure switch has been triggered. | Yes | Yes |
| 10006 | The minimum mean pressure limiter has been triggered. | Yes | Yes |
| 10013 | The minimum low pressure (< 0.9 bar absolute) limiter has been triggered. | Yes | Yes |
| 10015 | The frost stat has been triggered in defrost mode. | Yes | Yes |
| 10023 | High pressure sensor has exceeded the limit. | Yes | Yes |
| 10024 | Hot gas temperature has exceeded limit. | Yes | Yes |
| 10025 | Sensor value of the "high pressure sensor" outside the permissible range. | Yes | Yes |
| 10027 | High pressure does not increase significantly above low pressure following compressor startup and a delay time. | Yes | Yes |
| 10028 | Superheating of the refrigerant at the evaporator discharge or the compressor intake for too long below the permissible limit. | Yes | Yes |
| 10029 | Unexpectedly high deviation of the expansion valve opening from the pre-control characteristic | Yes | Yes |
| 10034 | Flow rate measurement incorrect. | Yes | Yes |
| 10042 | Sensor value of the "condenser discharge sensor" outside the permissible range | Yes | Yes |
| 10047 | The low pressure switch has been triggered in defrost operation. | Yes | Yes |
| 10048 | The low pressure limiter has been triggered in cooling operation. | Yes | Yes |
| 10049 | The frost protection pressure sensor has responded. | Yes | Yes |
| 10099 | Sensor value of the "oil sump temperature sensor" outside the permissible range | Yes | Yes |
| 10108 | Low supply voltage on FES | Partly | Yes |
| 10115 | Incorrect communication with the FES. | Partly | Yes |
| 10227 | Maximum number of CRC errors detected. | Partly | Yes |
| 10228 | Error in communication with real time clock (RTC). | Partly | Yes |
| 10495 | It was not possible to build up a sufficient flow rate to start the cooling operation. | Yes | Yes |
| 10500 | An attempt to deactivate the charging pump to test the heat pump safety functions has failed. This may lead to a pressure drop in the heating circuit. It is possible to continue operating the system. | Yes | Yes |
| 10503 | The safety assembly of the heat pump has triggered a gas warning. | Yes | Yes |
| 10511 | Fan failure detected (no speed). A voltage reset for the fan was triggered. | Partly | Yes |
| 20012 | Outlet limiter for high pressure compressor has been triggered. | Yes | Yes |
| 20014 | Outlet limiter for low pressure compressor has been triggered. | Yes | Yes |
| 20022 | Start limiter – fault for high pressure compressor has been triggered. | Yes | Yes |
| 20033 | Minimum flow temperature not reached; switching point 6.5 °C. | Yes | Yes |
| 20035 | Limiter for power interruption to inverter of low pressure compressor has been triggered. | Partly | Yes |
| 20036 | Temperature limiter for inverter of low pressure compressor has been triggered. | Partly | Yes |
| 20037 | Rotor stalled limiter for low pressure compressor has been triggered. | Partly | Yes |
| 20038 | Start limiter – fault for low pressure compressor has been triggered. | Yes | Yes |
| 20039 | Limiter for power failure to inverter of high pressure compressor has been triggered. | Partly | Yes |
| 20040 | Temperature limiter for inverter of high pressure compressor has been triggered. | Partly | Yes |
| 20041 | Rotor stalled limiter for high pressure compressor has been triggered. | Partly | Yes |
| 20045 | Deviation between set and actual compressor speed values for a defined period of time (low pressure compressor in the case of two compressors) | Yes | Yes |
| 20046 | Deviation between set and actual compressor speed values for a defined period of time (high pressure compressor in the case of two compressors) | Yes | Yes |
| 20050 | Temperature limiter for minimum heat source flow temperature has tripped. | Yes | Yes |
| 20051 | Temperature limiter for minimum heat source return temperature has tripped. | Yes | Yes |
| 20057 | Major inverter fault: Inverter IGBT excess current | Yes | Yes |
| 20058 | Major inverter fault: PFC IGBT excess current | Yes | Yes |
| 20059 | Major inverter fault: DC link excess voltage | Yes | Yes |
| 20060 | Major inverter fault: DC link undervoltage | Yes | Yes |
| 20061 | Major inverter fault: AC input excess voltage | Yes | Yes |
| 20062 | Major inverter fault: AC input undervoltage | Yes | Yes |
| 20063 | Major inverter fault: Voltage differences between the three input phases | Yes | Yes |
| 20064 | Major inverter fault: Desaturation | Yes | Yes |
| 20065 | Major inverter fault: Inverter IGBTs excess temperature | Yes | Yes |
| 20066 | Major inverter fault: PFC IGBTs excess temperature. | Yes | Yes |
| 20067 | Major inverter fault: Rotor does not turn as expected. | Yes | Yes |
| 20068 | Major inverter fault: Arithmetic fault in the measuring and analysis process | Yes | Yes |
| 20069 | Major inverter fault: Input relay open | Yes | Yes |
| 20070 | Major inverter fault: Current differences between the three inverter IGBTs | Yes | Yes |
| 20071 | Major inverter fault: Current differences between the three PFC IGBTs | Yes | Yes |
| 20072 | Major inverter fault: EEPROM error | Yes | Yes |
| 20073 | Major inverter fault: Excess motor speed | Yes | Yes |
| 20074 | Minor inverter fault: DC link undervoltage | Yes | Yes |
| 20075 | Minor inverter fault: Torque limit reached | Yes | Yes |
| 20076 | Minor inverter fault: Modbus communication malfunctioning | Yes | Yes |
| 20077 | Minor inverter fault: Compressor scroll excess temperature | Yes | Yes |
| 20078 | Minor inverter fault: Compressor motor excess temperature | Yes | Yes |
| 20079 | Minor inverter fault: Switching circuit excess temperature | Yes | Yes |
| 20080 | Minor inverter fault: Inverter IGBTs excess temperature | Yes | Yes |
| 20081 | Minor inverter fault: PFC IGBTs excess temperature | Yes | Yes |
| 20084 | Minor inverter fault: Temperature differences between the three inverter IGBTs | Yes | Yes |
| 20085 | Minor inverter fault: Temperature differences between the three PFC IGBTs | Yes | Yes |
| 20091 | Minor inverter fault: Communication disrupted between analogue/digital converter and auxiliary processor | Yes | Yes |
| 20093 | Low relevance communication objects have been incorrectly transferred repeatedly between the IWS and inverter. | Yes | Yes |
| 20095 | INV major fault central fault 1 | Yes | Yes |
| 20096 | INV major fault central fault 2 | Yes | Yes |
| 20097 | INV minor fault central fault 1 | Yes | Yes |
| 20098 | INV minor fault central fault 2 | Yes | Yes |
| 20100 | Low pressure below SOA low pressure limit for impermissible length of time. | Yes | Yes |
| 20101 | Low pressure above SOA low pressure limit for impermissible length of time. | Yes | Yes |
| 20102 | SOA range exceeded | Yes | Yes |
| 20103 | High pressure below SOA high pressure limit for impermissible length of time. | Yes | Yes |
| 20104 | High pressure exceeds SOA HD limit for impermissible length of time. | Yes | Yes |
| 20105 | SOA range exceeded | Yes | Yes |
| 20135 | Major inverter fault: Input current limitation | Yes | Yes |
| 20136 | Major inverter fault: Output current limitation | Yes | Yes |
| 20137 | Major inverter fault: Phase loss | Yes | Yes |
| 20138 | Major inverter fault: Power module | Yes | Yes |
| 20139 | Major inverter fault: Mains power supply sensor | Yes | Yes |
| 20140 | Major inverter fault: Motor current offset | Yes | Yes |
| 20141 | Major inverter fault: PFC current offset | Yes | Yes |
| 20142 | Major inverter fault: Motor inductance measurement | Yes | Yes |
| 20143 | Major inverter fault: Motor phase resistance measurement | Yes | Yes |
| 20144 | Major inverter fault: Restart | Yes | Yes |
| 20145 | Major inverter fault: Motor excess current shutdown function | Yes | Yes |
| 20146 | Major inverter fault: IGBT US short circuit | Yes | Yes |
| 20147 | Major inverter fault: IGBT OS short circuit | Yes | Yes |
| 20148 | Major inverter fault: Motor phase short circuit | Yes | Yes |
| 20149 | Major inverter fault: SVM function | Yes | Yes |
| 20150 | Major inverter fault: Fan inverter excess current | Yes | Yes |
| 20151 | Major inverter fault: Fan SVM function | Yes | Yes |
| 20152 | Major inverter fault: Fan DC excess voltage | Yes | Yes |
| 20153 | Major inverter fault: Fan DC excess voltage | Yes | Yes |
| 20154 | Major inverter fault: Fan inverter excess temperature | Yes | Yes |
| 20155 | Major inverter fault: Fan rotor vector | Yes | Yes |
| 20156 | Major inverter fault: Fan motor excess speed | Yes | Yes |
| 20157 | Major inverter fault: Fan phase loss | Yes | Yes |
| 20158 | Major inverter fault: Fan power module | Yes | Yes |
| 20159 | Major inverter fault: Fan motor current offset | Yes | Yes |
| 20160 | Major inverter fault: Fan motor inductance measurement | Yes | Yes |
| 20161 | Major inverter fault: Fan motor phase resistance measurement | Yes | Yes |
| 20162 | Major inverter fault: Fan motor excess current shutdown function | Yes | Yes |
| 20163 | Major inverter fault: Fan IGBT US short circuit | Yes | Yes |
| 20164 | Major inverter fault: Fan IGBT OS short circuit | Yes | Yes |
| 20165 | Minor inverter fault: Fan DC undervoltage | Yes | Yes |
| 20166 | Minor inverter fault: Fan Modbus is faulty | Yes | Yes |
| 20167 | Minor inverter fault: Inverter fan below temperature | Yes | Yes |
| 20168 | Minor inverter fault: Fan DC link initialisation | Yes | Yes |
| 20169 | Minor inverter fault: Fan central fault 1 | Yes | Yes |
| 20170 | Low relevance communication objects have been incorrectly transferred repeatedly between the IWS and inverter (fan section). | Yes | Yes |
| 20171 | High relevance communication objects have been incorrectly transferred repeatedly between the IWS and inverter (fan section). | Yes | Yes |
| 20226 | Major inverter fault: Fan motor phase short circuit | Yes | Yes |
| 20230 | Minor inverter fault: Fan mains undervoltage | Yes | Yes |
| 20231 | Minor inverter fault: Fan motor excess temperature | Yes | Yes |
| 20232 | Major inverter fault: PFC excess current shutdown function | Yes | Yes |
| 20233 | Minor inverter fault: Temperature control inverter | Yes | Yes |
| 20234 | Minor inverter fault: Input current control | Yes | Yes |
| 20235 | Major inverter fault: High pressure sensor range undershot | Yes | Yes |
| 20236 | Major inverter fault: Compressor type configuration | Yes | Yes |
| 20237 | Major inverter fault: High pressure sensor configuration | Yes | Yes |
| 20238 | Limiter ND frost protection (source side) | Yes | Yes |
| 20240 | The minimum overheating value of the oil sump compared to the condensation temperature for the monitoring time was permanently undershot. | Yes | Yes |
| 20241 | Update completed successfully | No | No |
| 20242 | Update completed successfully | No | No |
| 20243 | Update completed successfully | No | No |
| 20244 | Update failed | Partly | Yes |
| 20245 | Update failed | Partly | Yes |
| 20246 | Update failed | Partly | Yes |
| 20247 | Compression chamber, limit value exceeded | Yes | Yes |
| 20248 | Safety pressure cell has tripped. | Yes | Yes |
| 20249 | New HP-ID type detected | No | No |
| 20277 | Major inverter fault: Inverter extract air fan excess current | Yes | Yes |
| 20278 | Major inverter fault: Extract air fan SVM function | Yes | Yes |
| 20279 | Major inverter fault: Extract air fan DC excess voltage | Yes | Yes |
| 20281 | Major inverter fault: Inverter extract air fan excess temperature | Yes | Yes |
| 20282 | Major inverter fault: Extract air fan rotor vector | Yes | Yes |
| 20283 | Major inverter fault: Extract air fan motor excess speed | Yes | Yes |
| 20284 | Major inverter fault: Extract air fan phase loss | Yes | Yes |
| 20285 | Major inverter fault: Extract air fan power module | Yes | Yes |
| 20286 | Major inverter fault: Extract air fan motor current offset | Yes | Yes |
| 20288 | Major inverter fault: Extract air fan motor phase resistance measurement | Yes | Yes |
| 20289 | Major inverter fault: Extract air fan motor excess current shutdown function | Yes | Yes |
| 20290 | Major inverter fault: Extract air fan IGBT US short circuit | Yes | Yes |
| 20291 | Major inverter fault: Extract air fan IGBT OS short circuit | Yes | Yes |
| 20293 | Minor inverter fault: Extract air fan Modbus faulty | Yes | Yes |
| 20294 | Minor inverter fault: Inverter extract air fan below temperature | Yes | Yes |
| 20295 | Minor inverter fault: Extract air fan DC link initialisation | Yes | Yes |
| 20296 | Major inverter fault: Extract air fan motor phase short circuit | Yes | Yes |
| 20297 | Minor inverter fault: Extract air fan motor excess temperature | Yes | Yes |
| 20298 | Major inverter fault: Inverter supply air fan excess current | Yes | Yes |
| 20299 | Major inverter fault: Supply air fan SVM function | Yes | Yes |
| 20300 | Major inverter fault: Supply air fan DC excess voltage | Yes | Yes |
| 20302 | Major inverter fault: Inverter supply air fan excess temperature | Yes | Yes |
| 20303 | Major inverter fault: Supply air fan rotor vector | Yes | Yes |
| 20304 | Major inverter fault: Supply air fan motor excess speed | Yes | Yes |
| 20305 | Major inverter fault: Supply air fan phase loss | Yes | Yes |
| 20306 | Major inverter fault: Supply air fan power module | Yes | Yes |
| 20307 | Major inverter fault: Supply air fan motor current offset | Yes | Yes |
| 20308 | Major inverter fault: Central fault 3 | Yes | Yes |
| 20309 | Major inverter fault: Supply air fan motor phase resistance measurement | Yes | Yes |
| 20310 | Major inverter fault: Supply air fan motor excess current shutdown function | Yes | Yes |
| 20311 | Major inverter fault: Supply air fan IGBT US short circuit | Yes | Yes |
| 20312 | Major inverter fault: Supply air fan IGBT OS short circuit | Yes | Yes |
| 20313 | Major inverter fault: Fan central fault 1 | Yes | Yes |
| 20314 | Minor inverter fault: Supply air fan Modbus faulty | Yes | Yes |
| 20315 | Minor inverter fault: Inverter supply air fan below temperature | Yes | Yes |
| 20316 | Minor inverter fault: Supply air fan DC link initialisation | Yes | Yes |
| 20317 | Major inverter fault: Supply air fan motor phase short circuit | Yes | Yes |
| 20318 | Minor inverter fault: Supply air fan motor excess temperature | Yes | Yes |
| 20329 | Minor inverter fault: Extract air fan central fault 1 | Yes | Yes |
| 20334 | Minor inverter fault: Supply air fan central fault 1 | Yes | Yes |
| 20371 | Major inverter fault: Extract air fan central fault 1 | Partly | Yes |
| 20376 | Major inverter fault: Supply air fan central fault 1 | Partly | Yes |
| 20383 | Low relevance communication objects have been incorrectly transferred repeatedly between the IWS and inverter (extract air fan). | Yes | Yes |
| 20384 | High relevance communication objects have been incorrectly transferred repeatedly between the IWS and inverter (extract air fan). | Yes | Yes |
| 20386 | Low relevance communication objects have been incorrectly transferred repeatedly between the IWS and inverter (supply air fan). | Yes | Yes |
| 20387 | High relevance communication objects have been incorrectly transferred repeatedly between the IWS and inverter (supply air fan). | Yes | Yes |
| 20420 | Major inverter fault, compressor module: Short circuit motor phase (LeakageError) | Yes | Yes |
| 20421 | Major inverter fault, compressor module: Communication error between KV5 and KV4 (Intercom) | Yes | Yes |
| 20423 | Major inverter fault, compressor module: Fan on evaporator not turning (FanNotTurning). | Yes | Yes |
| 20424 | Major inverter fault, compressor module: Short circuit motor module KV4 fan (KV4IPMotorShortCircuit) | Yes | Yes |
| 20426 | Major inverter fault, compressor module: PFC temperature implausible (PFCTempUnplausible) | Yes | Yes |
| 20427 | Major inverter fault, compressor module: PFC excess temperature (>100 °C) (PFCOvertemp) | Yes | Yes |
| 20428 | Major inverter fault, compressor module: PFC faulty (PFCUtrip, PFCDriverShutdown) | Yes | Yes |
| 20429 | Major inverter fault, compressor module: Min. one DC-Link capacitor short circuit (DCLinkCapShort) | Yes | Yes |
| 20430 | Major inverter fault, evaporator fan: Short circuit motor phase (LeakageError) | Yes | Yes |
| 20431 | Major inverter fault, evaporator fan: Communication fault between KV5 and KV4 (intercom) | Yes | Yes |
| 20432 | Major inverter fault, evaporator fan: Mains voltage interrupted (MainsInterrupted). | Yes | Yes |
| 20433 | Major inverter fault, evaporator fan: DC link voltage too low (DCLinkVoltageLow) | Yes | Yes |
| 20435 | Major inverter fault, evaporator fan: Fan on evaporator not turning (FanNotTurning). | Yes | Yes |
| 20436 | Major inverter fault, extract air fan: Short circuit motor phase (LeakageError) | Yes | Yes |
| 20437 | Major inverter fault, extract air fan: Communication fault between KV5 and KV4 (intercom) | Yes | Yes |
| 20438 | Major inverter fault, extract air fan: Mains voltage interrupted (MainsInterrupted). | Yes | Yes |
| 20439 | Major inverter fault, extract air fan: DC link voltage too low (DCLinkVoltageLow) | Yes | Yes |
| 20441 | Major inverter fault, supply air fan: Short circuit motor phase (LeakageError) | Yes | Yes |
| 20442 | Major inverter fault, supply air fan: Communication fault between KV5 and KV4 (intercom) | Yes | Yes |
| 20443 | Major inverter fault, supply air fan: Mains voltage interrupted (MainsInterrupted). | Yes | Yes |
| 20444 | Major inverter fault, supply air fan: DC link voltage too low (DCLinkVoltageLow) | Yes | Yes |
| 20458 | Major inverter fault: Central fault 4 | Yes | Yes |
| 20459 | Major inverter fault: Fan central fault 2 | Yes | Yes |
| 20460 | Major inverter fault: Extract air fan central fault 2 | Yes | Yes |
| 20461 | Major inverter fault: Supply air fan central fault 2 | Yes | Yes |
| 20504 | IWS update performed | No | No |
| 20505 | ILS update performed | No | No |
| 20506 | IWS update failed | Yes | Yes |
| 20507 | ILS update failed | Partly | Yes |
| 20532 | The flow or return temperature exceeds the set limits. | Partly | Yes |
| 30002 | Compressor or starting contactor stuck. | Yes | Yes |
| 30007 | The minimum brine pressure limiter has been triggered. | Partly | Yes |
| 30008 | The HP type DIP switch of the IWS is set incorrectly. | Yes | Yes |
| 30009 | Sensor value of the "mean pressure sensor" outside the permissible range | Yes | Yes |
| 30010 | For heat pumps with one compressor and intermediate injection: sensor value of the "injection temperature sensor" outside the permissible range. For heat pumps with two compressors: sensor value of the "suction gas temperature sensor for high pressure compressor" outside the permissible range | Yes | Yes |
| 30011 | Sensor value of the "suction gas temperature sensor for low pressure compressor" outside theconnectors, a permissible range | Yes | Yes |
| 30016 | Sensor value of the "hot gas temperature sensor" outside the permissible range | Yes | Yes |
| 30017 | Sensor value of the "evaporator temperature sensor" outside the permissible range | Yes | Yes |
| 30018 | Sensor value of the "cooling sensor/recuperator sensor" outside the permissible range | Yes | Yes |
| 30019 | Sensor value of the "outside temperature sensor" outside the permissible range | Yes | Yes |
| 30020 | Sensor value of the "frost protection temperature sensor" outside the permissible range | Yes | Yes |
| 30021 | Sensor value of the "injection temperature sensor" outside the permissible range | Yes | Yes |
| 30025 | Sensor value of the "high pressure sensor" outside the permissible range | Yes | Yes |
| 30026 | Sensor value of the "low pressure sensor" outside the permissible range | Yes | Yes |
| 30031 | Sensor value of the "flow temperature sensor" outside the permissible range | Yes | Yes |
| 30032 | Sensor value of the "return temperature sensor" outside the permissible range | Yes | Yes |
| 30042 | Sensor value of the "condenser discharge sensor" outside the permissible range | Yes | Yes |
| 30043 | Sensor value of the "exhaust air temperature sensor" outside the permissible range | Yes | Yes |
| 30044 | Sensor value of the "differential pressure sensor" outside the permissible range | Yes | Yes |
| 30052 | Brine pressure switch has responded. | Yes | Yes |
| 30053 | At least two assemblies with the same bus ID are present on the bus system. | Yes | Yes |
| 30054 | The thermistor protection relay for the compressor has been triggered. | Yes | Yes |
| 30056 | Oil compensation valve does not open/close. | Yes | Yes |
| 30063 | Major inverter fault: Voltage differences between the three input phases. | Yes | Yes |
| 30082 | Minor inverter fault: Communication between signal processor and main processor is faulty. | Yes | Yes |
| 30083 | Minor inverter fault: Communication between signal processor and main processor is faulty. | Yes | Yes |
| 30086 | Minor inverter fault: Temperature sensor fault, scroll temperature below the permissible range. | Yes | Yes |
| 30087 | Minor inverter fault: Temperature sensor fault, motor temperature below the permissible range. | Yes | Yes |
| 30088 | Minor inverter fault: Temperature sensor fault, internal switching circuit temperature below the permissible range. | Yes | Yes |
| 30089 | Minor inverter fault: Temperature sensor fault, inverter IGBTs below the permissible range. | Yes | Yes |
| 30090 | Minor inverter fault: Temperature sensor fault, PFC IGBTs below the permissible range. | Yes | Yes |
| 30092 | Minor inverter fault: Inverter fault limit has been achieved and inverter was interlocked. | Yes | Yes |
| 30094 | High relevance communication objects have been incorrectly transferred repeatedly between the IWS and inverter. | Yes | Yes |
| 30099 | Sensor value of the "oil sump temperature sensor" outside the permissible range | Yes | Yes |
| 30106 | The defined minimum source temperature was not reached. | Yes | Yes |
| 30107 | Incorrect communication with the WPM. | Partly | Yes |
| 30110 | Sensor value of the "FE 7" outside the permissible range | Partly | Yes |
| 30111 | FES version conflict | Partly | Yes |
| 30112 | WPE version conflict | Partly | Yes |
| 30113 | FET version conflict | Partly | Yes |
| 30114 | WPM version conflict | Partly | Yes |
| 30117 | Limiter communication interruption IWS/CWS | Yes | Yes |
| 30124 | The minimum flow rate was undershot during defrosting. | Yes | Yes |
| 30125 | MFG sensor value of the "HP return temperature" outside the permissible range. | Yes | Yes |
| 30126 | MFG sensor value of the "HP flow temperature" outside the permissible range. | Yes | Yes |
| 30127 | MFG sensor value of the "flow rate" outside the permissible range. | Yes | Yes |
| 30128 | Incorrect communication with the HP return temperature sensor in the MFG. | Yes | Yes |
| 30129 | Incorrect communication with the HP flow temperature sensor in the MFG. | Yes | Yes |
| 30130 | Incorrect communication with the heating circuit flow rate sensor in the MFG. | Yes | Yes |
| 30133 | Heat pump fan speed could not be detected. | Yes | Yes |
| 30172 | Float switch has tripped. | Yes | Yes |
| 30173 | IWS sensor value of the "heat source return temperature" outside the permissible range | Yes | Yes |
| 30174 | IWS sensor value of the "heat source flow temperature" outside the permissible range | Yes | Yes |
| 30175 | MFG sensor value of the "HP return temperature" outside the permissible range | Partly | Yes |
| 30176 | MFG sensor value of the "WP flow temperature" outside the permissible range | Partly | Yes |
| 30177 | MFG sensor value of the "NHZ flow temperature" outside the permissible range | Partly | Yes |
| 30178 | MFG sensor value of the "DHW temperature" outside the permissible range | Partly | Yes |
| 30186 | The heating circuit pump on the MFG cannot be switched. | Partly | Yes |
| 30188 | The 3-way diverter valve in the MFG cannot be switched. | Partly | Yes |
| 30189 | The emergency/auxiliary heater in the MFG cannot be switched. | Partly | Yes |
| 30190 | Incorrect communication with the HP return temperature sensor in the MFG. | Partly | Yes |
| 30191 | Incorrect communication with the HP flow temperature sensor in the MFG. | Partly | Yes |
| 30192 | Incorrect communication with the NHZ flow sensor in the MFG. | Partly | Yes |
| 30193 | Incorrect communication with the DHW temperature sensor in the MFG. | Partly | Yes |
| 30196 | Incorrect communication with the heating circuit flow rate sensor in the MFG. | Partly | Yes |
| 30197 | Incorrect communication with the brine circuit flow rate sensor in the MFG. | Partly | Yes |
| 30198 | Incorrect communication with the heating circuit pressure sensor in the MFG. | Partly | Yes |
| 30199 | Incorrect communication with the brine pressure sensor in the MFG. | Partly | Yes |
| 30201 | Incorrect communication with the heating circuit pump in the MFG. | Partly | Yes |
| 30202 | Incorrect communication with the brine pump in the MFG. | Partly | Yes |
| 30203 | Incorrect communication with the 3-way diverter valve in the MFG. | Partly | Yes |
| 30204 | Incorrect communication with the emergency/ auxiliary heater in the MFG. | Partly | Yes |
| 30205 | Incorrect communication with the MFG. | Partly | Yes |
| 30206 | Sensor value of the "current sensor" outside the permissible range. | Yes | Yes |
| 30207 | Sensor value of "outside temperature sensor" outside the permissible range | Partly | Yes |
| 30208 | Sensor value of "buffer temperature sensor (heating circuit sensor 1)" outside the permissible range | Partly | Yes |
| 30209 | Sensor value of "flow temperature sensor" outside the permissible range | Partly | Yes |
| 30210 | Sensor value of "heating circuit sensor 2" outside the permissible range | Partly | Yes |
| 30211 | Sensor value of "heating circuit sensor 3" outside the permissible range | Partly | Yes |
| 30212 | Sensor value of "DHW cylinder sensor" outside the permissible range | Partly | Yes |
| 30213 | Sensor value of "source sensor" outside the permissible range | Partly | Yes |
| 30214 | Sensor value of "heat generator 2" outside the permissible range | Partly | Yes |
| 30215 | Sensor value of "flow cooling sensor" outside the permissible range | Partly | Yes |
| 30216 | Sensor value of "DHW circulation temperature sensor" outside the permissible range | Partly | Yes |
| 30217 | Sensor value of "swimming pool sensor, primary" outside the permissible range | Partly | Yes |
| 30218 | Sensor value of "swimming pool sensor, secondary" outside the permissible range | Partly | Yes |
| 30219 | Sensor value of "heating circuit sensor 4" outside the permissible range | Partly | Yes |
| 30220 | Sensor value of "heating circuit sensor 5" outside the permissible range | Partly | Yes |
| 30221 | Sensor value of "DHW cylinder 2 sensor" outside the permissible range | Partly | Yes |
| 30222 | Sensor value of "differential sensor 1.1" or "thermostat sensor 1" outside the permissible range | Partly | Yes |
| 30223 | Sensor value of "differential sensor 1.2" outside the permissible range | Partly | Yes |
| 30224 | Sensor value of "differential sensor 2.1" or "thermostat sensor 2" outside the permissible range | Partly | Yes |
| 30225 | Sensor value of "differential sensor 2.2" outside the permissible range | Partly | Yes |
| 30229 | Sensor value of "evaporator inlet temperature sensor" outside the permissible range | Yes | Yes |
| 30239 | The heating circuit assigned in FEK 2 is not present in the WPM. | Partly | Yes |
| 30248 | Safety pressure cell has tripped. | Yes | Yes |
| 30251 | The brine pressure switch for minimum brine pressure has responded. | Yes | Yes |
| 30252 | Sensor value of the "expansion valve inlet temperature sensor" outside the permissible range | Yes | Yes |
| 30397 | Supply air temperature outside permissible range (ventilation) | Partly | Yes |
| 30398 | Exhaust air temperature outside permissible range (ventilation) | Partly | Yes |
| 30399 | Outdoor air temperature preheated beyond permissible range (ventilation) | Partly | Yes |
| 30403 | Communication fault, fine dust sensor (ventilation) | Partly | Yes |
| 30404 | SUP fan (no speed feedback) (ventilation) | Partly | Yes |
| 30405 | EHA fan (no speed feedback) (ventilation) | Partly | Yes |
| 30406 | Communication fault, outdoor air humidity and temperature SHT31 (ventilation) | Partly | Yes |
| 30407 | Communication fault, extract air humidity and temperature SHT31 (ventilation) | Partly | Yes |
| 30408 | Heating coil fault (temperature too low, SUP shutdown) (ventilation) | Partly | Yes |
| 30409 | Heater contact triggered (ventilation) | Partly | Yes |
| 30410 | Sensor voltage (ventilation) | Partly | Yes |
| 30457 | Major inverter fault, compressor module: Second STO input open (stove /chimney contact) | Yes | Yes |
| 30467 | Faulty temperature and humidity sensor in programming unit | Partly | Yes |
| 30468 | Temperature limiter for maximum oil sump temperature has responded. | Yes | Yes |
| 30469 | Faulty VOC sensor in programming unit | Partly | Yes |
| 30470 | Internal fault, no V-ID entered in ventilation module | Partly | Yes |
| 30475 | Sensor value of the "water pressure sensor" outside the permissible range. | Partly | Yes |
| 30479 | Minimum water flow rate for activating auxiliary heater not reached | Partly | Yes |
| 30480 | The system pressure is too low. | Partly | Yes |
| 30483 | Auxiliary heater without power supply | Partly | Yes |
| 30488 | Sensor value of the "ventilation" outside temperature sensor outside the permissible range | Partly | Yes |
| 30489 | I2C sensor value for "Preheated outdoor air humidity" outside the permissible range | Partly | Yes |
| 30490 | I2C sensor value for "Extract air temperature" outside the permissible range | Partly | Yes |
| 30491 | I2C sensor value for "Extract air humidity" outside the permissible range | Partly | Yes |
| 30492 | I2C sensor value of the "Supply air differential pressure sensor" outside the permissible range | Partly | Yes |
| 30493 | I2C sensor value of the "Exhaust air differential pressure sensor" outside the permissible range | Partly | Yes |
| 30494 | I2C sensor value of the "Extract air differential pressure sensor" outside the permissible range | Partly | Yes |
| 30497 | Switching contact for the sacrificial anode has been triggered. | Partly | Yes |
| 30501 | The safety valve cannot be moved during a function test. | Yes | Yes |
| 30502 | When the safety valve is open, no water flow rate can be measured via the heat pump during a function test. | Yes | Yes |
| 30503 | The safety assembly of the heat pump has triggered a gas warning. | Yes | Yes |
| 30508 | Double addressing of the EBPE detected. | Yes | Yes |
| 30509 | It was not possible to establish communication between IWS and EBPE. | Yes | Yes |
| 30512 | Safety prompts not supported. | Yes | Yes |
| 30513 | Function test could not be performed. | Yes | Yes |
| 30514 | A mechanical ventilation fan is not achieving its set flow rate. | Partly | Yes |
| 30515 | No HP ID selected. | Partly | Yes |
| 30516 | No hydraulic ID selected. | Partly | Yes |
| 30533 | Minimum flow rate not present at compressor start. | Partly | Yes |
| 40481 | System pressure low. | Partly | Yes |
| 40482 | System pressure too high. | Partly | Yes |
| 50002 | Repeated instances of message number X-0002 has led to heat pump interlock. | Yes | Yes |
| 50003 | Repeated instances of message number X-0003 has led to heat pump interlock. | Yes | Yes |
| 50004 | Repeated instances of message number X-0004 has led to heat pump interlock. | Yes | Yes |
| 50006 | Repeated instances of message number X-0006 has led to heat pump interlock. | Yes | Yes |
| 50008 | The HP type DIP switch of the IWS is set incorrectly. | Yes | Yes |
| 50013 | Repeated instances of message number X-0013 has led to heat pump interlock. | Yes | Yes |
| 50015 | Repeated instances of message number X-0015 has led to heat pump interlock. | Yes | Yes |
| 50026 | Sensor value of "low pressure sensor" outside the permissible range | Yes | Yes |
| 50027 | Repeated instances of message number X-0027 has led to heat pump interlock. | Yes | Yes |
| 50028 | Repeated instances of message number X-0028 has led to heat pump interlock. | Yes | Yes |
| 50029 | Repeated instances of message number X-0029 has led to heat pump interlock. | Yes | Yes |
| 50034 | Repeated instances of message number X-0034 has led to heat pump interlock. | Yes | Yes |
| 50047 | Repeated instances of message number X-0047 has led to heat pump interlock. | Yes | Yes |
| 50048 | Repeated instances of message number X-0048 has led to heat pump interlock. | Yes | Yes |
| 50049 | Repeated instances of message number X-0049 has led to heat pump interlock. | Yes | Yes |
| 50133 | Heat pump fan speed could not be detected. | Yes | Yes |
| 50248 | Repeated instances of message number X-0248 has led to heat pump interlock. | Yes | Yes |
| 50250 | Temperature switch on compressor case has tripped. | Yes | Yes |
| 50400 | Communication fault, supply air differential pressure (ventilation) | Yes | Yes |
| 50401 | Communication fault, exhaust air differential pressure (ventilation) | Yes | Yes |
| 50402 | Communication fault, extract air differential pressure (ventilation) | Yes | Yes |
| 50411 | OA preheated, ventilation Tmax exceeded (ventilation) | Yes | Yes |
| 50468 | Repeated instances of message number X-0468 has led to heat pump interlock. | Yes | Yes |
| 50495 | It was repeatedly not possible to build up a sufficient flow rate to start cooling operation. | Yes | Yes |
| 50496 | Diverter valve has not switched. It is not possible to operate the heat pump in reverse mode. | Yes | Yes |
| 50501 | Repeated instances of message number X-0501 has led to heat pump interlock. | Yes | Yes |
| 50502 | Repeated instances of message number X-0502 has led to heat pump interlock. | Yes | Yes |
| CENTRAL-FAULT | 230 V signal not present at the IWS fault inputs 10 s after a controlled heat pump shutdown; red LED on IWS flashes. | Yes | Yes |
| COMM-U-IWS-CSW | Limiter communication interruption IWS / CWS. | Yes | Yes |
| COMMUNICATION-IWS-INV-H | High relevance communication objects repeatedly transferred incorrectly between IWS and inverter. | Yes | Yes |
| COMMUNICATION-IWS-INV-N | Low relevance communication objects repeatedly transferred incorrectly between IWS and inverter. | Yes | Yes |
| CONTACTOR-STUCK | Compressor or starting contactor stuck. | Yes | Yes |
| DEFROST | During defrost the flow, return or frost-protection temperature fell below 10 °C (or flow rate too low, e.g. <10 l/min WPL 15, <15 l/min WPL 25). | Yes | Yes |
| ERR-CURRENT | Value of the current sensor outside the permissible range. | Yes | Yes |
| ERR-DEFROST | Multiple DEFROST faults within a defined compressor runtime (5 in 2 hours). | Yes | Yes |
| ERR-EV-DIFF-PR | Sensor value of the differential pressure sensor outside the permissible range. | Yes | Yes |
| ERR-FLOW-RATE | 5 FLOW RATE faults in 24 hours of compressor runtime. | Yes | Yes |
| ERR-HD-PRESSURE | 5 faults (multiple responses) of the HIGH PRESSURE limiter within a defined compressor runtime. | Yes | Yes |
| ERR-HD-SENSOR | Sensor value of the high pressure sensor outside the permissible range. | Yes | Yes |
| ERR-K-LOW-IWS | Multiple REFRIGERANT LOW faults within a defined compressor runtime. | Yes | Yes |
| ERR-K-OUTPUT | Multiple NO OUTPUT faults within a defined compressor runtime (5 in 2 hours). | Yes | Yes |
| ERR-M-SUPERHEATING-IWS | Multiple MIN SUPERHEATING faults within a defined compressor runtime. | Yes | Yes |
| ERR-MD-PRESSURE | Multiple MEAN PRESSURE faults within a defined compressor runtime. | Yes | Yes |
| ERR-MD-SENSOR | Sensor value of the mean pressure sensor outside the permissible range. | Yes | Yes |
| ERR-ND-COOLING | 5 ND COOLING faults in 2 hours of compressor runtime. | Yes | Yes |
| ERR-ND-DEFROST | 5 ND DEFROST faults in 2 hours of compressor runtime. | Yes | Yes |
| ERR-ND-PRESSURE | 5 faults (multiple responses) of the LOW PRESSURE limiter within a defined compressor runtime (e.g. 2 hours). | Yes | Yes |
| ERR-ND-SENSOR | Sensor value of the low pressure sensor outside the permissible range. | Yes | Yes |
| ERR-NHZ-MFG | The electric emergency/booster heater in the MFG is faulty. | Yes | Yes |
| ERR-OIL-COMPENSATION | Oil compensation valve does not open/close. | Yes | Yes |
| ERR-PU-HZG-MFG | Error heating circuit pump MFG. | Yes | Yes |
| ERR-T-AUS-IWS | Sensor value of the outside temperature sensor outside the permissible range. | Yes | Yes |
| ERR-T-COOL-IWS | Cooling/recuperator sensor value outside permissible range. | Yes | Yes |
| ERR-T-EIN-IWS | Sensor value of the injection temperature sensor outside the permissible range. | Yes | Yes |
| ERR-T-EXHA-IWS | Sensor value of the exhaust air sensor outside the permissible range. | Yes | Yes |
| ERR-T-FROS-IWS | Sensor value of the frost protection sensor outside the permissible range. | Yes | Yes |
| ERR-T-HTG-IWS | Sensor value of the hot gas temperature sensor outside the permissible range. | Yes | Yes |
| ERR-T-OIL-S-IWS | Sensor value of the oil sump temperature sensor outside the permissible range. | Yes | Yes |
| ERR-T-RUE-IWS | Sensor value of the return sensor outside the permissible range. | Yes | Yes |
| ERR-T-SUCT | Sensor value of the compressor inlet (suction gas) temperature sensor outside the permissible range. | Yes | Yes |
| ERR-T-SUCT-VHD | Sensor value of the suction gas temperature sensor for high pressure compressor outside the permissible range. | Yes | Yes |
| ERR-T-SUCT-VND | Sensor value of the suction gas temperature sensor for low pressure compressor outside the permissible range. | Yes | Yes |
| ERR-T-VER-IWS | Sensor value of the evaporator temperature sensor outside the permissible range. | Yes | Yes |
| ERR-T-VFL-IWS | Sensor value of the condenser outlet sensor outside the permissible range. | Yes | Yes |
| ERR-T-VOR-IWS | Sensor value of the flow sensor outside the permissible range. | Yes | Yes |
| ERR-VALVE-MFG | Error 3-way diverter valve MFG. | Yes | Yes |
| EXV-LP-2 | 3 LP 2 faults in 10 minutes of compressor runtime have occurred. | Yes | Yes |
| FLOW-RATE | Flow rate monitoring (from heating output, flow and return temperature) has responded. | Yes | Yes |
| FROST-PROTECTION | The frost protection pressure sensor has responded (brine/source side). | Yes | Yes |
| HD-SENSOR-MAX | The high pressure sensor maximum limit has been reached. | Yes | Yes |
| HEXADECIMAL-SWITCH | Heat pump type DIP switch on the IWS set incorrectly (e.g. for cascade mode). | Yes | Yes |
| HIGH-PRESSURE | The high pressure limiter has responded (switching point e.g. 30 bar abs type 1; 42 bar type 3; 29/39 bar type 4). | Yes | Yes |
| I-INV-V-HD | Limiter for power failure to inverter of high pressure compressor has been triggered. | Yes | Yes |
| I-INV-V-ND | Limiter for power interruption to inverter of low pressure compressor has been triggered. | Yes | Yes |
| INV-H-AC-EXCESS-VOLTAGE | Major inverter fault: AC input excess voltage. | Yes | Yes |
| INV-H-AC-UNDERVOLTAGE | Major inverter fault: AC input undervoltage. | Yes | Yes |
| INV-H-AC-VOLTAGE-BALANCE | Major inverter fault: Voltage differences between the three input phases. | Yes | Yes |
| INV-H-ARITHMETIC | Major inverter fault: Arithmetic fault in the measuring and analysis process. | Yes | Yes |
| INV-H-CENTRAL-FAULT-1 | Major inverter fault: INV major fault central fault 1. | Yes | Yes |
| INV-H-CENTRAL-FAULT-2 | Major inverter fault: INV major fault central fault 2. | Yes | Yes |
| INV-H-DC-EXCESS-VOLTAGE | Major inverter fault: DC intermediate circuit excess voltage. | Yes | Yes |
| INV-H-DC-UNDERVOLTAGE | Major inverter fault: DC intermediate circuit undervoltage. | Yes | Yes |
| INV-H-DESATURATION | Major inverter fault: Desaturation. | Yes | Yes |
| INV-H-INPUT-RELAY-OPEN | Major inverter fault: Input relay open. | Yes | Yes |
| INV-H-INV-CURRENT-BALANCE | Major inverter fault: Current differences between the three inverter IGBTs. | Yes | Yes |
| INV-H-INV-EXCESS-CURRENT | Major inverter fault: Inverter IGBT excess current. | Yes | Yes |
| INV-H-INV-EXCESS-TEMP | Major inverter fault: Inverter IGBTs excess temperature. | Yes | Yes |
| INV-H-MOTOR-EXCESS-SPEED | Major inverter fault: Motor excess speed. | Yes | Yes |
| INV-H-PFC-CURRENT-BALANCE | Major inverter fault: Current differences between the three PFC IGBTs. | Yes | Yes |
| INV-H-PFC-EXCESS-CURRENT | Major inverter fault: PFC IGBT excess current. | Yes | Yes |
| INV-H-PFC-EXCESS-TEMP | Major inverter fault: PFC IGBTs excess temperature. | Yes | Yes |
| INV-H-ROTOR-VECTOR | Major inverter fault: Rotor does not turn as expected. | Yes | Yes |
| INV-H-SELV-RANGE-EXT | Major inverter fault: LV range exceeded. | Yes | Yes |
| INV-N-ADC-COMM | Minor inverter fault: Communication between analogue/digital converter and auxiliary processor is faulty. | Yes | Yes |
| INV-N-BOARD-EXCESS-TEMP | Minor inverter fault: Switching circuit excess temperature. | Yes | Yes |
| INV-N-BOARD-LOW-TEMP | Minor inverter fault: Temperature sensor fault, internal switching circuit temperature below the permissible range. | Yes | Yes |
| INV-N-CENTRAL-FAULT-1 | Minor inverter fault: INV minor fault central fault 1. | Yes | Yes |
| INV-N-CENTRAL-FAULT-2 | Minor inverter fault: INV minor fault central fault 2. | Yes | Yes |
| INV-N-COMM-AFTER-DSP | Minor inverter fault: Communication between signal processor and main processor is faulty. | Yes | Yes |
| INV-N-DC-UNDERVOLTAGE | Minor inverter fault: DC intermediate circuit undervoltage. | Yes | Yes |
| INV-N-DSP-AFTER-COMM | Minor inverter fault: Communication between signal processor and main processor is faulty. | Yes | Yes |
| INV-N-FAULT-LIMIT-FATAL | Minor inverter fault: Inverter fault limit has been achieved and inverter was interlocked. | Yes | Yes |
| INV-N-INV-EXCESS-TEMP | Minor inverter fault: Inverter IGBTs excess temperature. | Yes | Yes |
| INV-N-INV-LOW-TEMPERATURE | Minor inverter fault: Temperature sensor fault, inverter IGBTs below the permissible range. | Yes | Yes |
| INV-N-INV-TEMP-BALANCE | Minor inverter fault: Temperature differences between the three inverter IGBTs. | Yes | Yes |
| INV-N-MODBUS-ERROR | Minor inverter fault: Modbus communication is faulty. | Yes | Yes |
| INV-N-MOTOR-EXCESS-TEMP | Minor inverter fault: Compressor motor excess temperature. | Yes | Yes |
| INV-N-MOTOR-LOW-TEMP | Minor inverter fault: Temperature sensor fault, motor temperature below the permissible range. | Yes | Yes |
| INV-N-PFC-EXCESS-TEMP | Minor inverter fault: PFC IGBT excess temperature. | Yes | Yes |
| INV-N-PFC-LOW-TEMPERATURE | Minor inverter fault: Temperature sensor fault, PFC IGBTs below the permissible range. | Yes | Yes |
| INV-N-PFC-TEMP-BALANCE | Minor inverter fault: Temperature differences between the three PFC IGBTs. | Yes | Yes |
| INV-N-SCROLL-EXCESS-TEMP | Minor inverter fault: Compressor scroll excess temperature. | Yes | Yes |
| INV-N-SCROLL-LOW-TEMP | Minor inverter fault: Temperature sensor fault, scroll temperature below the permissible range. | Yes | Yes |
| INV-N-TORQUE-LIMIT | Minor inverter fault: Torque limit achieved. | Yes | Yes |
| IWS-RED-LED-FLASHING | Red LED on the IWS (integral heat pump controller) flashes: single fault; appliance shut down and restarts after 10 minutes. | Yes | Yes |
| IWS-RED-LED-ON | Red LED on the IWS illuminates: more than 5 faults within 2 hours run; appliance shut down permanently until reset. | Yes | Yes |
| LOW-PRESSURE | The low pressure sensor/minimum low pressure limiter has responded (switching point depends on HP type, e.g. 1.2 bar abs within 60 s for type 1; <2 bar for 10 s type 3; <1.0 bar for 240 s type 4). | Yes | Yes |
| LP-2 | Low pressure < 0.9 bar absolute within 5 seconds. | Yes | Yes |
| MAX-HOT-GAS | Hot gas temperature exceeded limit (125 °C types 1/2; 140 °C types 3/4). | Yes | Yes |
| MEAN-PRESSURE | Minimum mean pressure limiter triggered (e.g. below 2 bar for 10 s / 1.0 bar for 240 s). | Yes | Yes |
| MIN-FLOW-COOL | Minimum flow temperature not reached in cooling; switching point 6.5 °C. | Yes | Yes |
| MIN-SOURCE | The defined minimum source temperature was not reached. | Yes | Yes |
| MIN-SUPERHEATING | Superheating at the evaporator outlet / compressor inlet below the permissible minimum for too long. | Yes | Yes |
| ND-COOLING | Low pressure sensor responded in cooling mode (switching point 4 bar abs within 5 s). | Yes | Yes |
| ND-DEFROST | Low pressure sensor responded in defrost mode (switching point 2 bar abs within 10 s). | Yes | Yes |
| NO-IWS-PARAM | Heat pump type was not transferred to the controller. | Yes | Yes |
| NO-OUTPUT | High pressure does not rise significantly above low pressure after compressor start (e.g. HP < LP + 2 bar within 30/120 s). | Yes | Yes |
| OUTL-INV-V-HD | Outlet limiter for high pressure compressor has been triggered. | Yes | Yes |
| OUTL-INV-V-ND | Outlet limiter for low pressure compressor has been triggered. | Yes | Yes |
| REFRIGERANT-LOW | Unexpectedly high deviation of expansion valve opening from the pre-control characteristic (superheating high with valve opening above limit). | Yes | Yes |
| ROTOR-KL-V-HD | Rotor stalled limiter for high pressure compressor has been triggered. | Yes | Yes |
| ROTOR-KL-V-ND | Rotor stalled limiter for low pressure compressor has been triggered. | Yes | Yes |
| SENSOR-BREAK-E-70 | System fault: mixer sensor break. | Partly | Yes |
| SENSOR-BREAK-E-71 | System fault: source sensor break. | Partly | Yes |
| SENSOR-BREAK-E-72 | System fault: flow sensor break. | Partly | Yes |
| SENSOR-BREAK-E-73 | System fault: return sensor break. | Partly | Yes |
| SENSOR-BREAK-E-75 | System fault: outside temperature sensor break. | Partly | Yes |
| SENSOR-BREAK-E-76 | System fault: DHW sensor break. | Partly | Yes |
| SENSOR-BREAK-E-77 | System fault: heat source 2 (HS 2) sensor break. | Partly | Yes |
| SENSOR-BREAK-E-80 | System fault: remote control (sensor) break. | Partly | Yes |
| SENSOR-BREAK-E-129 | System fault: collector (solar) sensor break. | Partly | Yes |
| SOA-HD-ALLOCATION | SOA range exceeded (high pressure allocation). | Yes | Yes |
| SOA-HD-EXCEEDED | High pressure exceeds SOA high-pressure limit for impermissible length of time. | Yes | Yes |
| SOA-HD-UNDERSHOT | High pressure below SOA high-pressure limit for impermissible length of time. | Yes | Yes |
| SOA-ND-ALLOCATION | SOA range exceeded (low pressure allocation). | Yes | Yes |
| SOA-ND-EXCEEDED | Low pressure exceeds SOA low-pressure limit for impermissible length of time. | Yes | Yes |
| SOA-ND-UNDERSHOT | Low pressure below SOA low-pressure limit for impermissible length of time. | Yes | Yes |
| SPEED-DEV-COMP-HD | Speed deviation between set and actual values of the high pressure compressor for a defined time. | Yes | Yes |
| SPEED-DEV-COMP-ND | Speed deviation between set and actual compressor values for a defined time (low pressure compressor). | Yes | Yes |
| START-F-V-ND | Start limiter fault for low pressure compressor has been triggered. | Yes | Yes |
| START-INV-C-HP | Start limiter fault for high pressure compressor has been triggered. | Yes | Yes |
| SUPERHEATING-INV-V-HD | Temperature limiter for inverter of high pressure compressor has been triggered. | Yes | Yes |
| SUPERHEATING-INV-V-ND | Temperature limiter for inverter of low pressure compressor has been triggered. | Yes | Yes |
| TO-MFG | MFG timeout. | Yes | Yes |
| TO-NHZ-MFG | Incorrect communication of the electric emergency/booster heater in the MFG. | Yes | Yes |
| TO-P-HK-MFG | Incorrect communication with the MFG (heating circuit pressure). | Yes | Yes |
| TO-PU-HK-MFG | Incorrect communication between heating circuit pump and MFG. | Yes | Yes |
| TO-T-VOR-NHZ-MFG | The flow sensor of the electric emergency/booster heater in the multifunction assembly (MFG) is faulty/timeout. | Yes | Yes |
| TO-VALVE-MFG | Incorrect communication between 3-way diverter valve and MFG. | Yes | Yes |
| TO-VOL-HK-MFG | Incorrect communication with the MFG (heating circuit flow rate). | Yes | Yes |