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All Auer error codes

This page lists Auer error codes grouped by failure type: what each code means, its likely causes, and what you can safely check before calling a professional.
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The Auer codes on this page, grouped by failure type.

Compressor — Auer

The compressor is the key, most expensive part. These codes protect the unit by shutting it down before damage occurs: never force repeated restarts.

Code COMPRES-1 ERRInformationair-to-water
Compressor sensor 1 failure
Possible causes
  • Compressor sensor 1 out of measurement range
What you can check
  • check the compressor sensor 1 connection on the heat pump’s control board
  • check the compressor sensor 1 cable
  • check the sensor’s resistance value (ohms)
  • replace compressor sensor 1
Models affected: HRC 70
This issue requires a qualified technician. Do not open the unit.
Code COMPRES-2 ERRInformationair-to-water
Compressor sensor 2 failure
Possible causes
  • Compressor sensor 2 out of measurement range
What you can check
  • check the compressor sensor 2 connection on the heat pump’s control board
  • check the compressor sensor 2 cable
  • check the sensor’s resistance value (ohms)
  • replace compressor sensor 2
Models affected: HRC 70
This issue requires a qualified technician. Do not open the unit.

General fault — Auer

These codes don’t point to a specific part: the unit is reporting that an internal safety feature has tripped.

Code STARTER 1 ERRInformationair-to-water
Soft starter 1 fault
Possible causes
  • Startup issue, unsuitable power supply, insufficient supply voltage, soft starter fault
What you can check
  • check that the electrical supply is suitable for the heat pump’s power rating
  • check that the supply voltage doesn’t drop below 200V during startup
  • note down the starter’s fault code
  • check the supply voltage
  • check the power wiring in the electrical cabinet up to compressor 1’s terminals
Models affected: HRC 70
This issue requires a qualified technician. Do not open the unit.
Code STARTER 2 ERRInformationair-to-water
Soft starter 2 fault
Possible causes
  • Startup issue, unsuitable power supply, insufficient supply voltage, soft starter fault
What you can check
  • check that the electrical supply is suitable for the heat pump’s power rating
  • check that the supply voltage doesn’t drop below 200V during startup
  • note down the starter’s fault code
  • check the supply voltage
  • check the power wiring in the electrical cabinet up to compressor 2’s terminals
Models affected: HRC 70
This issue requires a qualified technician. Do not open the unit.

Temperature sensor — Auer

These codes indicate a sensor that’s no longer returning a consistent value. The problem is almost always with the sensor itself or its connector, rarely with the unit.

Code AMBIANCE 1 ERRInformationair-to-water
Room sensor 1 fault
Possible causes
  • Note: the room sensor with display registers as SONDE INT for circuit 1 only
  • Circuit 1’s room control is set to SENSOR and it is out of measurement range, or
  • It isn’t, so the pool sensor is recognized and it is out of measurement range
What you can check
  • check the room sensor 1 connection on the HRC Pilot board
  • check the room sensor 1 cable
  • check the sensor’s resistance value (ohms)
  • replace room sensor 1
Models affected: HRC 70
Code AMBIANCE 2 ERRInformationair-to-water
Room sensor 2 fault
Possible causes
  • Note: the room sensor with display registers as SONDE INT for circuit 1 only. Circuit 2 is set to radiators or underfloor heating with a room sensor, and this sensor is out of measurement range
What you can check
  • check the room sensor 2 connection on the HRC Pilot board
  • check the room sensor 2 cable
  • check the sensor’s resistance value (ohms)
  • replace room sensor 2
Models affected: HRC 70

All Auer codes published on the site

This list updates automatically whenever a new guide is added.

Technical information provided for guidance only, based on manufacturer documentation and field reports. It does not replace a diagnosis by a qualified professional. Found an error on this page? Report it.