List of error codes for the Auer HRC 70 air-to-water heat pump
List of error codes for the air-to-water heat pump – Auer HRC 70
Download the manual for the Auer HRC 70 air-to-water heat pump
Cut the power before starting any troubleshooting
| Screen display | Nature of the fault | Actions to take |
| AIR PAC
ERR |
PAC air sensor fault |
• check the connection of the PAC air sensor on the PAC board
• check the connector of the PAC air sensor • check the ohmic value of the sensor • replace the PAC air sensor |
| EVAPO
ERR |
Defrost sensor fault |
• check the connection of the defrost sensor on the PAC board
• check the defrost sensor cable • check the ohmic value of the sensor • replace the defrost sensor |
| AMBIANCE
ERR |
Room sensor fault |
• check the connection of the room sensor on the HRC Pilot board
• check the room sensor cable • check the ohmic value of the sensor • replace the room sensor |
| AMBIANCE 1
ERR |
Room sensor 1 fault |
• check the connection of room sensor 1 on the HRC Pilot board
• check the room sensor 1 cable • check the ohmic value of the sensor • replace room sensor 1 |
| AMBIANCE 2
ERR |
Room sensor 2 fault |
• check the connection of room sensor 2 on the HRC Pilot board
• check the room sensor 2 cable • check the ohmic value of the sensor • replace room sensor 2 |
|
BUS ERR |
Bus connection fault |
• check that the PAC is powered on
• check the bus connection on the HRC Pilot board (2 wires) without ground • check the bus connection on the PAC board (2 wires) with ground • three-phase PAC connected with 2 phases reversed • check the phase controller (green and orange lights should be on) • check the condition of the 4A fuse on the outdoor unit |
| COMPRES-1
ERR |
Compressor 1 sensor fault |
• check the connection of the compressor 1 sensor on the PAC board
• check the compressor 1 sensor cable • check the ohmic value of the sensor • replace the compressor 1 sensor |
| COMPRES-2
ERR |
Compressor 2 sensor fault |
• check the connection of the compressor 2 sensor on the PAC board
• check the compressor 2 sensor cable • check the ohmic value of the sensor • replace the compressor 2 sensor |
|
DEBIT ERR |
Insufficient water flow or No flow |
• check that the circulator pump is working properly (manual override)
• check for voltage at the circulator pump terminals (qualified personnel only) • clean the filter valve • clear any blockage in the circulator pump if needed • check that the check valve is installed the right way around |
| DEBIT BAS
ERR |
Low water flow |
• set the circulator pump to speed 3
• clean the filter valve • check that the length and diameter of the hydraulic network are suitable • check that the condenser inlet is not clogged |
| DEBISTAT
ERR |
Flow controller malfunction | • check the flow controller wiring on the HRC Pilot board
• check that the flow controller paddle is not stuck • check that the flow controller has not been bypassed |
| DEGI. FREQU.
ERR |
Defrost cycles too frequent |
• check that the fan is working properly
• check the condition of the coil • check that the PAC air sensor and Evapo sensor are working properly • evaporation pressure too low: (qualified personnel only) |
| DEGI. LONG
ERR |
Defrost cycle too long |
• check that the fan is working properly
• check the condition of the coil • check that the PAC air sensor and Evapo sensor are working properly • check that the four-way valve is working properly: (qualified personnel only) |
| EXTERIEUR
ERR |
Outdoor sensor fault |
• check the connection of the outdoor sensor on the HRC Pilot board
• check the outdoor sensor cable • check the ohmic value of the sensor • replace the outdoor sensor |
| HORLOGE
ERR |
Clock failure |
•1- Press the clock button and set the date and time
•2- If the fault persists: replace the HRC Pilot’s electronic board |
| MEMOIRE
ERR |
Memory card fault |
• replace the HRC Pilot’s electronic board |
| MODULE
96°C |
Heating water outlet overheat fault > 80°C
Display of the measured temperature |
• check that the power relays for the electric backup heaters are working properly
• check that the backup boiler’s flow is sufficient • check the condition of the backup boiler control • check that the heating circulator pump is working properly |
| MODULE
ERR |
HRC Pilot water outlet sensor fault |
• check the connection of the HRC Pilot water outlet sensor on the HRC Pilot board
• check the HRC Pilot water outlet sensor cable • check the ohmic value of the HRC Pilot water outlet sensor • replace the HRC Pilot water outlet sensor |
| Screen display | Nature of the fault | Actions to take |
| PAC DEPAR.
76.2°C |
PAC outlet overheat fault > 75°C Display of the measured temperature | • check the condition of the filter valve: clean the filter
• check that the PAC circulator pump’s flow is sufficient • check that the heating circulator pump is working properly |
| PAC DEPAR.
ERR |
PAC water outlet sensor fault |
• check the connection of the PAC water outlet sensor on the PAC board
• check the PAC water outlet sensor cable • check the ohmic value of the PAC water outlet sensor • replace the PAC water outlet sensor |
| PAC RETOU.
ERR |
PAC water inlet sensor fault |
• check the connection of the PAC water inlet sensor on the PAC board
• check the PAC water inlet sensor cable • check the ohmic value of the PAC water inlet sensor • replace the PAC water inlet sensor |
| PB T. DEGIV
ERR |
Inconsistent evaporator sensor reading |
• check that the PAC air sensor and Evapo sensor are working properly
• check that the four-way valve is working properly • check that the compressor starter is not faulty • check that the Evapo sensor is not covered in ice |
|
PB ALIM CP1 |
Compressor 1 power supply fault |
• check that the electrical network is suitable for the heat pump’s power rating
• check that the supply voltage does not drop below 200 W during startup • check that the compressor 1 starter is not faulty (see “Compressor startup fault” section) • check the supply voltage • check the power wiring in the electrical cabinet up to the compressor 1 terminals • check the compressor 1 discharge sensor |
|
PB ALIM CP2 |
Compressor 2 power supply fault |
• check that the electrical network is suitable for the heat pump’s power rating
• check that the supply voltage does not drop below 200 W during startup • check that the compressor 2 starter is not faulty (see “Compressor startup fault” section) • check the supply voltage • check the power wiring in the electrical cabinet up to the compressor 2 terminals • check the compressor 2 discharge sensor |
|
STARTER 1 ERR |
Soft starter 1 fault |
• check that the electrical network is suitable for the heat pump’s power rating
• check that the supply voltage does not drop below 200V during startup • record the starter’s fault code • check the supply voltage • check the power wiring in the electrical cabinet up to the compressor 1 terminals |
|
STARTER 2 ERR |
Soft starter 2 fault |
• check that the electrical network is suitable for the heat pump’s power rating
• check that the supply voltage does not drop below 200V during startup • record the starter’s fault code • check the supply voltage • check the power wiring in the electrical cabinet up to the compressor 2 terminals |
| PISCINE
ERR |
Pool sensor fault |
• check the connection of the pool sensor on the HRC Pilot board
• check the pool sensor cable • check the ohmic value of the pool sensor • replace the pool sensor |
|
PLACE SE ERR |
Outdoor temperature reading fault
The outdoor sensor and the PAC air sensor show very different values |
• check the position of the outdoor sensor
• check the respective values of both sensors (outdoor and PAC air) ĺ if one of the two sensors shows an incorrect value, check the condition of that sensor • check the condition of the cable and connections for each sensor • replace the faulty sensor |
|
PRESSION 0.2 |
Low water pressure fault |
• the water pressure in the heating circuit must be above 0.5 bar when cold
• check the tightness of the heating circuit and repair any water leaks • bleed the air from the high points and from the HRC Pilot • check that the pressure relief valve in the heat pump is sealed properly • check that the pressure relief valve in the HRC Pilot is sealed properly • check that the expansion tank is large enough for the volume of the system |
|
SECU. BP |
PAC low pressure fault |
• check that the fan is working properly (capacitor and electrical connections)
• check the surface condition of the finned coil and remove anything that could block airflow through the rear grille (leaves, or other debris…) • if fully iced over, stop the PAC and let it thaw, pouring warm water over it if needed • refrigerant leak or blocked defrost valve or faulty expansion valve: the refrigerant circuit must be serviced by a qualified technician |
|
SECU. HP 1 |
PAC compressor 1 high pressure fault |
• check the condition of the filter valve
• check that the heating network has been properly bled • check that the PAC circulator pump is working properly • clean the plate heat exchanger inlet • malfunction of the discharge valve or four-way valve |
|
SECU. HP 2 |
PAC compressor 2 high pressure fault |
• check the condition of the filter valve
• check that the heating network has been properly bled • check that the PAC circulator pump is working properly • clean the plate heat exchanger inlet • malfunction of the discharge valve or four-way valve |
| SONDE ECS
ERR |
Pool sensor fault |
• check the DHW sensor connection on the HRC Pilot board
• check the DHW sensor cable • check the DHW sensor’s ohmic value • replace the DHW sensor |
Faults are indicated by a flashing backlight.
Any fault that blocks operation is signaled by an alarm buzzer. When the fault must be cleared by manual reset, the symbol 🔧 (or similar) is displayed.
| Display | Name | Cause of fault | Consequence(s) | Repair
Clearing the fault |
| AIR PAC
ERR |
Tair sensor failure |
Heat pump Tair sensor out of measurement range |
Setpoint temperature = (Max. water temp. + Min. water temp.) / 2 | Automatic after repair |
|
AMBIANCE 1 ERR |
Amb1 sensor failure |
Note : the room sensor
with display is identified as SONDE INT for circuit 1 only • The room control for circuit 1 is set to SENSOR and it is out of measurement range or • It is not, so the pool sensor is recognized and it is out of measurement range |
Room in demand |
Automatic after repair |
|
AMBIANCE 2 ERR |
Amb2 sensor failure |
Note: the room sensor with display is identified 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 |
Room in demand |
Automatic after repair |
|
BUS err |
BUS |
Shielded 2-wire link
or faulty BUS wiring or blown fuse or faulty board(s) |
Heat pump stopped, backup heater only allowed |
BUS connection
or fuse replacement or board(s) replacement / Manual |
|
compres-1 err |
Compressor 1 sensor failure | Compressor 1 sensor out of measurement range | Both compressors stopped
and fan stopped |
Automatic after repair |
|
Compressor 1 temperature fault |
“Compressor 1 overheat” (compressor temperature >115°C) repeated more than 24 times in 24h |
Both compressors stopped |
Manual |
|
|
compres-2 err |
Compressor 2 sensor failure |
Compressor 2 sensor out of measurement range |
Both compressors stopped and fan stopped |
Automatic after repair |
|
Compressor 2 temperature fault |
“Compressor 2 overheat” (compressor temperature >115°C) repeated more than 24 times in 24h |
Both compressors stopped |
Manual |
|
| DEBIT
ERR |
Zero flow fault |
“Zero flow error” repeated after 8 attempts | Heat pump stopped | Manual |
| DEBIT BAS | Low flow error | Heat pump inlet/outlet temperature difference too high |
Operation unchanged |
Manual |
|
debitstat err |
Flow switch failure |
Flow input = 1 and
Heat pump circulator output = 0 |
Heat pump will not start
= heat pump stopped and backup heater running (if allowed) |
Automatic as soon as flow = 0 and CPAC = 0 |
|
Zero flow error |
Flow input = 0, heat pump circulator = 1 |
Heat pump will not start |
Automatic via heat pump circulator attempts
= 1 every 2 minutes |
|
| DEGI. FREQU.
ERR |
Defrost too frequent fault |
More than 3 defrost cycles per hour |
Heat pump stopped,
backup heater only allowed |
Manual |
|
DEGI. LONG ERR |
Defrost too long fault | “Defrost too long error” repeated more than 8 times in 24h | Heat pump stopped,
backup heater only allowed |
Manual |
|
Defrost too long error |
After 20 min. Defrost temp < 15°C |
Operation unchanged |
Automatic |
| Display | Name | Cause of fault | Consequence(s) | Repair
Clearing the fault |
| EVAPO
ERR |
Tdefrost sensor failure |
Tdefrost sensor out of measurement range |
Heat pump stopped,
backup heater only allowed |
Automatic after repair |
| exterieur
err |
Outdoor sensor failure |
Outdoor sensor out of measurement range |
Heat pump air temperature replaces outdoor temperature if outdoor sensor is unplugged |
Automatic after repair |
| horloge
err |
Clock |
•1-Clock not set • 2-Faulty board |
Operation in Permanent eco mode
(comfort schedules ignored) |
Manual |
| memory
err |
Memory |
Memory fault |
PAC shutdown
and backup heater shutdown |
Board replacement /
Manual |
|
MODULE 96°C |
HRC Pilot outlet overheat fault | “HRC Pilot outlet overheat error” repeated more than 12 times per 24h | Shutdown of both compressors and backup heaters | Manual |
|
HRC Pilot outlet overheat error |
TsEAU > 80°C |
Temporary shutdown
of one compressor and backup heaters |
Automatic once TsEAU < 80 – 10°C |
|
| PAC OUTLET
ERR |
TsPAC sensor failure |
TsPAC sensor out of measurement range |
PAC shutdown,
backup heater only allowed |
Automatic after repair |
|
PAC OUTLET 76.2°C |
PAC outlet overheat fault | “PAC outlet overheat error” repeated more than 10 times per 24h | Shutdown of both compressors and backup heaters | Manual |
| PAC outlet water overheat error |
TsPAC > 75°C |
Temporary shutdown of
both compressors and backup heaters |
Automatic once TsPAC < 75 – 10°C | |
| PAC RETURN
ERR |
TePAC sensor failure |
TePAC sensor out of measurement range |
PAC shutdown,
backup heater only allowed |
Automatic after repair |
|
PB POWER CP1 |
Compressor 1 power supply fault |
Problem during startup, unsuitable electrical network, insufficient supply voltage, faulty soft starter. | Compressor 1 is shut down.
The heat pump will retry starting the compressor every hour. |
Manual once normal operation is restored |
|
PB POWER CP2 |
Compressor 2 power supply fault |
Problem during startup, unsuitable electrical network, insufficient supply voltage, faulty soft starter. | Compressor 2 is shut down.
The heat pump will retry starting the compressor every hour. |
Manual once normal operation is restored |
|
STARTER 1 ERR |
Soft starter 1 fault |
Problem during startup, unsuitable electrical network, insufficient supply voltage, faulty soft starter. | Compressor 1 is shut down.
The heat pump will retry starting the compressor every 20 minutes |
Manual |
|
STARTER 2 ERR |
Soft starter 2 fault |
Problem during startup, unsuitable electrical network, insufficient supply voltage, faulty soft starter. | Compressor 2 is shut down.
The heat pump will retry starting the compressor every 20 minutes |
Manual |
|
PB T.DEFROST |
Inconsistent evaporator sensor |
The values read by the air and evaporator sensors are inconsistent while a compressor is running. |
Fault displayed, the heat pump keeps running |
Manual
once normal operation is restored |
| Pilot
err |
TsEAU sensor failure |
TsEAU sensor out of measurement range |
Backup heater shutdown | Automatic after repair |
| pool
err |
Pool sensor failure | The pool sensor’s resistance value is too low | Pool set to no demand | Automatic after repair |
| SENSOR LOC
ERR |
Outdoor sensor location error |
Tair – Ext > 15K or
Ext – Tair > 15K |
Temperature for the water curve = (Tair+Ext)/2 |
Automatic |
| pressure
err |
Pressure sensor failure | Pressure sensor disconnected or faulty | PAC and backup heater shutdown | Automatic after repair |
| Display | Name | Cause of the fault | Consequence(s) | Repair
fault clearing |
| pressure
0.2 |
Low water pressure |
Pressure measured by pressure sensor < 0.3 bar |
Shutdown of both compressors and backup heaters
and of the circulator pumps after 2 min. |
Automatic once pressure > 0.5 bar |
| SECU. HP1 | HP1 safety | HP1 pressure switch opened | Shutdown of both compressors | Manual |
| SAFETY HP2 | HP2 safety trip | Opening of the HP2 pressure switch | Shutdown of both compressors | Manual |
|
SAFETY LP |
LP low pressure fault |
Opening of the LP pressure switch |
Shutdown of both compressors |
Automatic when the pressure switch closes Manual after the 3rd error within the same hour |
| DHW SENSOR
ERR |
DHW sensor failure
(Amb2 input on the board) |
Circuit 2 is set to domestic hot water with a DHW sensor, and this sensor is out of measurement range. |
DHW set to no demand |
Automatic after repair |