Climaveneta / De Longhi Professional · No longer sold new in the UK. 96 codes across 3 product families, each taken from the manufacturer’s manuals.
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96 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| A001 | BT1 system heat exchanger water inlet temperature probe | Not stated | Yes |
| A002 | BT2 system heat exchanger water outlet temperature probe | Not stated | Yes |
| A003 | BT8 DHW storage temperature probe | Not stated | Yes |
| A005 | BT9 storage tank temperature probe | Not stated | Yes |
| A006 | BT11 outside air temperature probe | Not stated | Yes |
| A013 | F1 high pressure switch | Yes | Yes |
| A019 | Difference between low and high pressure in refrigerant circuit too low | Yes | Yes |
| A022 | Operation outside of limits | Not stated | Yes |
| A025 | Differential pressure switch / system flow switch F3 activated | Not stated | Yes |
| A030 | Compressor operating hours reached | Not stated | Yes |
| A033 | System pump operating hours reached | Not stated | Yes |
| A034 | Domestic hot water pump operating hours reached | Not stated | Yes |
| A035 | Mixed zone pump operating hours reached | Not stated | Yes |
| A036 | Fan operating hours reached | Not stated | Yes |
| A038 | System heat exchanger frost prevention alarm | Not stated | Yes |
| A041 | DHW storage temperature too high | Not stated | Yes |
| A042 | Inside frost prevention alarm | Not stated | Yes |
| A054 | Legionella prevention alarm | Not stated | Yes |
| A055 | Temperature probe N-THC n.1 | Not stated | Yes |
| A056 | Address setting error on remote terminal supplied with the unit | Not stated | Yes |
| A057 | Address setting error on expansion module 2 | Not stated | Yes |
| A058 | Temperature probe in low temperature zone LT2, expansion 2 | Not stated | Yes |
| A063 | Address setting error on expansion module 3 | Not stated | Yes |
| A064 | Temperature probe in low temperature zone LT3, expansion 3 | Not stated | Yes |
| A075 | Water temperature too high in mixed circuit, expansion module 1 | Not stated | Yes |
| A077 | Water temperature too high in mixed circuit, expansion module 2 | Not stated | Yes |
| A094 | End defrost due to maximum time | Not stated | Yes |
| A095 | Temperature probe N-THC n.2 | Not stated | Yes |
| A096 | Address setting error on zone remote terminal | Not stated | Yes |
| A097 | Temperature probe N-THC n.3 | Not stated | Yes |
| A098 | Address setting error on zone remote terminal | Not stated | Yes |
| A099 | Temperature probe N-THC n.4 | Not stated | Yes |
| A100 | Address setting error on zone remote terminal | Not stated | Yes |
| A101 | Temperature probe N-THC n.5 | Not stated | Yes |
| A102 | Address setting error on zone remote terminal | Not stated | Yes |
| A103 | Address setting error on expansion module 1 | Not stated | Yes |
| A104 | Low temperature zone LT1 temperature probe, expansion 1 | Not stated | Yes |
| A109 | Low pressure alarm from low pressure switch | Yes | Yes |
| A114 | Solar/pool module address setting error | Not stated | Yes |
| A115 | Solar/pool module general alarm | Not stated | Yes |
| A116 | Master unit not connected, cascade control | Not stated | Yes |
| A117 | Slave unit not connected, cascade control | Not stated | Yes |
| A120 | Water temperature too high in mixed circuit, expansion module 3 | Not stated | Yes |
| A121 | Temperature probe N-THC n.6 | Not stated | Yes |
| A122 | Address setting error on zone LT3 remote terminal | Not stated | Yes |
| A123 | i-KI/i-KIR general alarm - problems relating to the heat pump (see heat pump PCB display codes) | Yes | Yes |
| A124 | Humidity probe N-THC n.1 | Not stated | Yes |
| A125 | Humidity probe N-THC n.2 | Not stated | Yes |
| A126 | Humidity probe N-THC n.3 | Not stated | Yes |
| A127 | Humidity probe N-THC n.4 | Not stated | Yes |
| A128 | Humidity probe N-THC n.5 | Not stated | Yes |
| A129 | Humidity probe N-THC n.6 | Not stated | Yes |
| Er01 | High pressure switch tripped; manual reset after 3 activations in one hour; incorrect phase connection (three-phase models) | Yes | Yes |
| Er03 | High pressure alarm from pressure transducer | Yes | Yes |
| Er05 | Low pressure switch tripped; manual reset after 4 activations in one hour | Yes | Yes |
| Er07 | Low pressure alarm from pressure transducer | Yes | Yes |
| Er20 | Differential pressure switch or flow switch tripped; manual reset if active >30 s | Yes | Yes |
| Er25 | Differential pressure switch or well/source water flow switch activated; manual reset if active >30 s | Yes | Yes |
| Er30 | Frost prevention alarm (manual reset) | Yes | Yes |
| Er31 | Well / source frost prevention alarm (manual reset) - check BT3 position, source flow | Yes | Yes |
| Er35 | High water outlet temperature (automatic reset) | Yes | Yes |
| Er45 | Clock fault error (automatic reset) - replace controller | No | Yes |
| Er46 | Clock to be set error (automatic reset) - set date and time | No | Yes |
| Er47 | HSW11 communication error with remote keypad (only if remote keypad fitted) | Varies by model | Yes |
| Er48 | Anti-Legionella cycle not completed | Varies by model | Yes |
| Er60 | Faulty BT1 water return sensor (automatic reset) | Yes | Yes |
| Er61 | Faulty BT2 water outlet sensor (automatic reset) | Yes | Yes |
| Er64 | Faulty BT3 source water outlet sensor (automatic reset) | Yes | Yes |
| Er66 | Faulty domestic hot water sensor BT4 | Varies by model | Yes |
| Er68 | Outside air sensor BT3 malfunction (automatic reset) | Yes | Yes |
| Er75 | Pressure transducer malfunction | Yes | Yes |
| Er81 | Compressor maintenance interval reached | No | Yes |
| Er85 | Water pump maintenance interval reached | No | Yes |
| Er90 | Maximum alarm log size exceeded | No | Yes |
| PCB-A0 | DC voltage error | Yes | Yes |
| PCB-A1 | Outlet (discharge) temperature error | Yes | Yes |
| PCB-A2 | Overcurrent protection - direct current (DC) measurement | Yes | Yes |
| PCB-A3 | Current transformer disconnected | Yes | Yes |
| PCB-A4 | Overcurrent protection - alternating current (AC) measurement | Yes | Yes |
| PCB-A5 | Abnormal compressor rotation | Yes | Yes |
| PCB-A6 | Return (suction) temperature probe error | Yes | Yes |
| PCB-A7 | Defrost temperature probe error | Yes | Yes |
| PCB-A8 | Outlet (discharge) temperature probe error | Yes | Yes |
| PCB-C0 | Power supply module error | Yes | Yes |
| PCB-C1 | Upper fan motor error | Yes | Yes |
| PCB-C2 | Outside temperature probe error | Yes | Yes |
| PCB-C3 | Lower fan motor error / fan motor error (single-fan sizes) | Yes | Yes |
| PCB-C4 | Power module temperature increase (above 110 C) | Yes | Yes |
| PCB-C5 | Power supply module temperature probe error | Yes | Yes |
| PCB-C6 | Control board (PCB-controller) error | Yes | Yes |
| PCB-C7 | PCB serial interface error | Yes | Yes |
| PCB-C8 | PCB serial converter error | Yes | Yes |
| PCB-CC | Heat pump PCB controller serial error | Yes | Yes |
| PCB-E4 | Water outlet temperature probe error | Yes | Yes |
| PCB-E5 | Water return temperature probe error | Yes | Yes |
| PCB-FU | High pressure switch activated | Yes | Yes |