Installation Instructions

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