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Appendix
48 Installation instructions aroTHERM 0020147164_04
G Overview of fault codes
Code Meaning Cause
F.022 Water pressure too low Insufficient water in the heating system
F.037 Fan fault Obstruction in the product's air guiding
Fan motor not connected or faulty
The connection between the main PCB and the fan PCB is dam-
aged or broken.
F.042 Fault: Coding resistance The product's coding resistance is missing or is faulty
Coding resistance value outside the permissible range
X25 plug not connected or was connected incorrectly
F.073 Fault: Water pressure sensor Line to water pressure sensor is broken or has a short circuit
F.086 Contact thermostat has opened. Underfloor heating temperature too high
Heating circuit flow rate too low
Underfloor heating circuit is closed
F.103 Fault: Spare part detection The main PCB that is fitted as a spare part or the inverter does
not match the product
The "Max. duration power supply cut-off" parameter has been
set poorly (see the "Heat pump setting parameters" section in
the appendix).
F.514 Sensor fault: Comp. inlet temp.
Sensor is faulty or incorrectly connected to the main PCB
F.517 Sensor fault: Comp. outlet temp.
F.519 Sensor fault: Return temperature
F.520 Sensor fault: Flow temperature
F.523 Sensor fault: VF1 Line to VF1 temperature sensor is broken or has a short circuit.
F.526
Sensor fault: Temp. environment circuit EEV
1)
Sensor is faulty or incorrectly connected to the main PCB
F.532 Building circuit: Flow rate too low Pump faulty
Check the specific flow rate in the heating circuit during the
sensor/actuator test
Between 7000 and 7700 l/h: The power supply is not suffi-
cient
Between 7700 and 8200 l/h: The pump runs dry (no water in
the heating circuit; the heating circuit loses water)
Between 8200 and 8700 l/h: Fault in the electronics
Between 8700 and 9200 l/h: The pump is blocked
Between 9200 and 10,000 l/h: No PWM signal (cable faulty
or not connected; fault in the main PCB)
Pump faulty
Pump cabling faulty
Low water pressure
Dirt filter in the heating circuit return is missing or blocked
Heating circuit not fully purged
Pressure loss in the heating circuit too high
F.536 Compressor outlet temp. too high Coolant quantity too low
Sensor is faulty or incorrectly connected to the main PCB
Premature expansion in the liquid area of the coolant circuit (loss
of charge)
Electronic expansion valve faulty
Heat exchanger blocked
1) Sensor on the evaporator
2) Sensor on the condenser
48


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