Appendix
0020147164_07 aroTHERM Installation instructions
39
Code
Meaning
Cause
F.532
Building circuit: Flow rate too low
–
Heating circuit not fully purged
–
Dirt filter in the heating circuit return is missing or blocked
–
Low water pressure
–
Pressure loss in the heating circuit too high
–
Pump cabling faulty
–
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)
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
F.537
High pressure switch opened
–
Coolant volume too high or too low
–
Vacuum insufficient (10 mbar)
–
Incondensable particle in the coolant circuit
–
Pressure switch or electrical connection faulty
–
Premature expansion in the liquid area of the coolant circuit (loss
of charge)
–
Flow quantity too high (see defined maximum flow rate)
–
Flow rate monitor faulty
–
Insufficient heat transfer in the heat exchanger
F.539
Refrigerant pressure too low
–
Coolant quantity too low
–
Air flow too low
–
No thawing
–
The resistance heating in the condensate receiver is faulty.
–
4-way valve faulty
–
Electronic expansion valve motor faulty, or connection faulty
F.546
Sensor fault: High pressure
–
Faulty cabling
F.554
Coolant pressure not in operating range
–
Coolant volume too high or too low
–
Incondensable particle in the coolant circuit
–
Electronic expansion valve faulty
–
Premature expansion in the liquid area of the coolant circuit (loss
of charge)
–
Flow quantity too high (see defined maximum flow rate)
–
Insufficient heat exchange in the plate heat exchanger or the
ribbed pipe heat exchanger
–
4-way valve faulty
–
Temperature sensor faulty
F.582
EEV fault
–
Cable insulation faulty
–
Connection broken
F.585
Sensor fault: Temp. building circuit EEV
2)
–
Sensor is faulty or incorrectly connected to the main PCB
F.685
Communication fault: eBUS
–
The product is not connected to the controller
–
Polarity inverted
F.750
Connection fault: Compressor
–
Cable insulation faulty
–
Connection broken
F.751
Compressor: Overcurrent fault
–
The product's voltage supply is too low
–
The ribbed pipe heat exchanger or heat exchanger is dirty
1) Sensor on the evaporator
2) Sensor on the condenser
