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Itho Daalderop Heat Pump Error Codes
Every Itho Daalderop Heat Pump code in the database, with its meaning. Open a code for its causes, the checks to run in order, and how to clear it.
| Code | Meaning | Fix level |
|---|---|---|
A1 1also: A01 1 | Temperature sensor T1 (outdoor) is faulty or reads outside the normal operating range | Call a professional |
A1 10also: A01 10 | Temperature sensor T11 (heating return) is faulty or reads outside the normal operating range | Call a professional |
A1 11also: A01 11 | Temperature sensor T10 (heating flow) is faulty or reads outside the normal operating range | Call a professional |
A1 12also: A01 12 | The pressure sensor of the heating circuit passes on no usable reading | Call a professional |
A1 13also: A01 13 | Current measuring coil 1 is not working properly or is faulty | Call a professional |
A1 14also: A01 14 | Current measuring coil 2 is not working properly or is faulty | Call a professional |
A1 15 | The flow sensor of the source circuit is not working properly or is faulty | Call a professional |
A1 16also: A01 16 | An automatic function or setting has been switched to manual operation | Not a fault |
A1 17also: A01 17 | The high-pressure switch (pressostat) in the refrigerant circuit has tripped | Call a professional |
A1 18also: A01 18 | The high-pressure switch (pressostat) is not working properly or is faulty | Call a professional |
A1 19also: A01 19 | The water pressure of the heating system is too low; the heat pump does not work until the pressure is restored | DIY checks first |
A1 2also: A01 2 | Temperature sensor T3 (storage vessel, low) is faulty or reads outside the normal operating range | Call a professional |
A1 20also: A01 20 | The water pressure of the heating system is low; the heat pump does keep working | DIY-friendly |
A1 21 | Compressor protection tripped: the compressor starting current is too high or the temperature protection is not working properly | Call a professional |
A1 22 | The phase sequence in the wall socket is not clockwise (right-rotating) | Call a professional |
A1 23 | There is no clockwise rotating field on the incoming 3-phase supply of the heat pump | Call a professional |
A1 24also: A01 24 | The current draw of the compressor is too low | Call a professional |
A1 25also: A01 25 | The current draw of the electric heating element is too low | Call a professional |
A1 26also: A01 26 | The current draw of the compressor is too high | Call a professional |
A1 27also: A01 27 | The current draw of the electric heating element is too high | Call a professional |
A1 28also: A01 28 | The source return temperature (sensor T8) is too low | Call a professional |
A1 29also: A01 29 | The source supply temperature (sensor T9) is too low | Call a professional |
A1 3also: A01 3 | Temperature sensor T2 (storage vessel, high) is faulty or reads outside the normal operating range | Call a professional |
A1 30also: A01 30 | The liquid temperature (sensor T7) is too high | Call a professional |
A1 31also: A01 31 | The discharge-gas temperature (sensor T6) is too high | Call a professional |
A1 32also: A01 32 | The injection temperature (sensor T4) is too low | Call a professional |
A1 33also: A01 33 | The discharge-gas temperature is too high relative to the liquid temperature and the expansion valve is fully open | Call a professional |
A1 34 | The heating flow temperature (sensor T10) is too high | DIY checks first |
A1 36 | There is a communication fault between the heat pump and the room thermostat | DIY checks first |
A1 37 | The compressor draws current without being driven | Call a professional |
A1 38 | The relay of the electric heating element sticks | Call a professional |
A1 4also: A01 4 | Temperature sensor T4 (injection) is faulty or reads outside the normal operating range | Call a professional |
A1 42 | Temperature sensors T8 (source return) and T9 (source supply) are not working properly or are faulty | Call a professional |
A1 43 | An unsuitable thermostat has been connected to the heat pump | Call a professional |
A1 5also: A01 5 | Temperature sensor T5 (suction gas) is faulty or reads outside the normal operating range | Call a professional |
A1 6also: A01 6 | Temperature sensor T6 (discharge gas) is faulty or reads outside the normal operating range | Call a professional |
A1 7also: A01 7 | Temperature sensor T7 (liquid) is faulty or reads outside the normal operating range | Call a professional |
A1 8also: A01 8 | Temperature sensor T8 (source return) is faulty or reads outside the normal operating range | Call a professional |
A1 9also: A01 9 | Temperature sensor T9 (source supply) is faulty or reads outside the normal operating range | Call a professional |
All Heat Pumps error codes, every brand
More appliance types are being added. Codes vary by model and region.