Warmflow · A niche brand in the UK. 98 codes across 4 product families, each taken from the manufacturer’s manuals. Warmflow technical support ↗
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Type the code on your display or a word from its meaning. Each code opens its own page with what it means, whether it is safe and what you can check.
98 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| B01 | Probe B01 fault or disconnected - Brine Out temp sensor | Not stated | Yes |
| B02 | Probe B02 fault or disconnected - Brine In temp sensor | Not stated | Yes |
| B03 | Probe B03 fault or disconnected - DHW temp sensor | Not stated | Yes |
| B04 | Probe B04 fault or disconnected - Heating return | Not stated | Yes |
| B05 | Probe B05 fault or disconnected - Heating flow | Not stated | Yes |
| B06 | Probe B06 fault or disconnected - Brine flow meter | Not stated | Yes |
| B07 | Probe B07 fault or disconnected - Heating flow meter | Not stated | Yes |
| B08 | Probe B08 fault or disconnected - External temperature | Not stated | Yes |
| Brine-circuit-freeze-risk | Brine circuit freeze risk | Not stated | Yes |
| Brine-flow-rate-too-low | Brine flow rate too low or blocked | Not stated | Yes |
| Commission-mode-enabled | Commission mode enabled | Partly | Yes |
| E003 | Driver Board Self Test | Yes | Yes |
| E04 | Electric Overheat Protection | Yes | Yes |
| E06 | Excess Temp. Diff. Between Inlet & outlet | Yes | Yes |
| E08 | Communication Error | Yes | Yes |
| E11 | High Pressure Protection | Yes | Yes |
| E12 | Low Pressure Protection | Yes | Yes |
| E19 | Primary Anti-freezing Protection | Yes | Yes |
| E29 | Secondary Anti-freezing Protection | Yes | Yes |
| E030 | Insufficient Defrosting Water Flow Alarm | Yes | Yes |
| E032 | Low Flow Error | Yes | Yes |
| E051 | Compressor Overload | Yes | Yes |
| E065 | Outlet Water Temp. Overtemp. | Yes | Yes |
| E071 | Outlet Water Temp. Lowtemp. | Yes | Yes |
| E081 | DC Fan Motor 1 & PCB Communication Error | Yes | Yes |
| E082 | DC Fan Motor 2 & PCB Communication Error | Yes | Yes |
| E084 | Display and Main Controller Not Compatible | Yes | Yes |
| E101 | Compressor Overcurrent | Yes | Yes |
| E103 | Fan Motor 1 Overload | Yes | Yes |
| E171 | Anti-freezing Protection | Yes | Yes |
| E203 | Fan Motor 2 Overload | Yes | Yes |
| F00 | Inverter IPM Overcurrent Shutdown | Yes | Yes |
| F01 | Compressor Start-up Failure | Yes | Yes |
| F03 | Power Factor Correction (PFC) Error | Yes | Yes |
| F05 | DC Bus Overload | Yes | Yes |
| F06 | DC Bus Underload | Yes | Yes |
| F07 | AC Input Underload | Yes | Yes |
| F08 | AC Input Overload | Yes | Yes |
| F09 | Input Voltage Read Error | Yes | Yes |
| F10 | AC Power Overvoltage Error | Yes | Yes |
| F11 | DSP Communication Error | Yes | Yes |
| F12 | DSP and PFC Communication Error | Yes | Yes |
| F13 | IPM Over Temperature Protection | Yes | Yes |
| F14 | Compressor Lacking Phase | Yes | Yes |
| F15 | Input Voltage Lacking Phase | Yes | Yes |
| F16 | Weak Magnetism Error | Yes | Yes |
| F17 | Module/Radiator Sensor Error | Yes | Yes |
| F18 | IPM Current Read Error | Yes | Yes |
| F20 | IGBT Power Device Error | Yes | Yes |
| F21 | Overspeed Error | Yes | Yes |
| F22 | AC Input Over Current Error | Yes | Yes |
| F23 | EEPROM Alarm | Yes | Yes |
| F24 | EEPROM Alarm | Yes | Yes |
| F25 | LP 15V Error | Yes | Yes |
| F26 | IGBT Power Device Over Temperature | Yes | Yes |
| F29 | EEPROM Alarm | Yes | Yes |
| F031 | DC Fan Motor 1 Error | Yes | Yes |
| F032 | DC Fan Motor 2 Error (AS03 models only) | Yes | Yes |
| F33 | Compressor Current Frequency Reduction Error | Yes | Yes |
| F101 | Fan Driver Power input Phase Error | Yes | Yes |
| F102 | Fan Start Error | Yes | Yes |
| F105 | Fan external Overcurrent Error | Yes | Yes |
| F106 | Fan IPM Overheat Error | Yes | Yes |
| F109 | Fan Driver Overspeed Error | Yes | Yes |
| F112 | Fan Current sampling Error | Yes | Yes |
| F113 | Fan internal Overcurrent Error | Yes | Yes |
| F120 | Fan Driver Temperature Sensor Error | Yes | Yes |
| F151 | Comp. Driver and PCB Communication Fault | Yes | Yes |
| Hardware-Alarm | Hardware Alarm | Not stated | Yes |
| Heating-circuit-freeze-risk | Heating circuit freeze risk | Not stated | Yes |
| Heating-flow-rate-too-low | Heating flow rate too low or blocked | Not stated | Yes |
| NO-LINK | NO LINK (user interface not communicating) | Not stated | Yes |
| P01 | Heating Return Temperature Sensor Error | Yes | Yes |
| P02 | Heating Flow Temperature Sensor Error | Yes | Yes |
| P02a | Mix Tube Outlet Water Temp. Sensor Fault | Yes | Yes |
| P03 | DHW Cylinder Temperature Sensor Error | Yes | Yes |
| P03a | Buffer Tank Temp. Sensor | Yes | Yes |
| P04 | Ambient Temperature Sensor Error | Yes | Yes |
| P013 | Heating Return Temperature Sensor Error | Yes | Yes |
| P17 | Suction Temperature Sensor Error | Yes | Yes |
| P018 | DHW Return Temperature Sensor Error | Yes | Yes |
| P023 | Heating Flow Temperature Sensor Error | Yes | Yes |
| P028 | DHW Flow Temperature Sensor Error | Yes | Yes |
| P42 | Room Temperature Sensor Error | Yes | Yes |
| P101 | EVI Inlet Temperature Sensor Error | Yes | Yes |
| P102 | EVI Outlet Temperature Sensor Error | Yes | Yes |
| P152 | Distributor Tube Temp. Sensor Fault | Yes | Yes |
| P153 | Evaporator Temperature Sensor Error | Yes | Yes |
| P181 | Discharge Temperature Sensor Error | Yes | Yes |
| P182 | Discharge Overheat Temperature Sensor Error | Yes | Yes |
| P191 | Anti-freezing Temp. Sensor Fault | Yes | Yes |
| PP1 | Discharge Pressure Sensor Error | Yes | Yes |
| PP2 | Suction Pressure Sensor Error | Yes | Yes |
| PP11 | Pressure Sensor Error | Yes | Yes |
| Service-due | Service is due | No | Yes |
| Software-Alarm | Software Alarm | Not stated | Yes |
| TC | No Cooling at Low AT Protection | Yes | Yes |
| TP | Low Ambient Temperature Warning | Yes | Yes |