Vaillant aroTHERM VWL 55/3 A 230 V Installation Instructions Manual page 33

Code Meaning
F.532 Building circuit: Flow rate too low
F.536 Compressor outlet temp. too high
F.537 High-pressure switch opened
F.539 Refrigerant pressure too low
F.546 Sensor fault: High pressure
F.554 Refrigerant pressure not in operating range
F.582 EEV fault
F.585
Sensor fault: Temp. building circuit EEV
F.685 Communication fault: eBUS
F.750 Connection fault: Compressor
F.751 Compressor: Overcurrent fault
1) Sensor on the evaporator
2) Sensor on the condenser
0020217827_03 aroTHERM Installation instructions
Cause
–
Heating circuit not fully purged
–
Dirt filter in the heating circuit return is missing or blocked
–
Water deficiency
–
Pressure loss in the heating circuit too high
–
Pump cabling defective
–
Pump faulty
Check the specific flow rate quantity 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 defect-
ive or not connected; fault in the main PCB)
–
Refrigerant quantity too low
–
Sensor is defective or incorrectly connected to the main PCB
–
Premature expansion in the liquid area of the refrigerant circuit
(loss of charge)
–
Electronic expansion valve defective
–
Heat exchanger blocked
–
Refrigerant volume too high or too low
–
Vacuum insufficient (10 mbar)
–
Incondensable particle in the refrigerant circuit
–
Pressure switch or electrical connection defective
–
Premature expansion in the liquid area of the refrigerant circuit
(loss of charge)
–
Flow rate quantity too high (see defined maximum flow rate)
–
Flow rate monitor defective
–
Insufficient heat transfer in the heat exchanger
–
Refrigerant quantity too low
–
Air flow too low
–
No thawing
–
The resistance heating in the condensate receiver is defective.
–
4-port diverter valve defective
–
Electronic expansion valve motor defective, or connection defect-
ive
Cabling defective
–
Refrigerant volume too high or too low
–
Incondensable particle in the refrigerant circuit
–
Electronic expansion valve defective
–
Premature expansion in the liquid area of the refrigerant circuit
(loss of charge)
–
Flow rate quantity too high (see defined maximum flow rate)
–
Insufficient heat exchange in the plate heat exchanger or the
finned-tube heat exchanger
–
4-port diverter valve defective
–
Temperature sensor defective
–
Cable insulation defective
–
Connection broken
2)
Sensor is defective or incorrectly connected to the main PCB
–
The product is not connected to the control
–
Polarity inverted
–
Cable insulation defective
–
Connection broken
–
The product's power supply is too low
–
The fin-type heat exchanger or heat exchanger is dirty
Appendix
33