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Troubleshooting
Service manual
29
RXM20~71R + ARXM25~71R + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11 – 2021.01
2
Check that all stop valves of the refrigerant circuit are open. See
Possible cause:
Closed stop valve in the refrigerant circuit.
3
Check if the refrigerant circuit is clogged. See
Possible cause:
Clogged refrigerant circuit.
4
Check if the refrigerant circuit is correctly charged. See
Possible cause:
Refrigerant shortage.
5
Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See
204].
Possible cause:
Non‑condensables and/or humidity in the refrigerant circuit.
6
Perform a check of the compressor. See
49].
Possible cause:
Faulty compressor or miswiring of the compressor power
supply cable.
7
Perform a check of the expansion valve. See
Possible cause:
Faulty expansion valve.
8
Check for leaks in the refrigerant circuit. Look for oil traces on the unit(s).
Check the brazing points on the field piping. Perform a pressure test, see
Possible cause:
Leak in the refrigerant circuit.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.5.30 U2-00 – Outdoor unit: Defect of power supply voltage
Trigger
Effect
Reset
Power supply abnormality
or instant power failure is
detected.
Unit will stop operating.
Power reset via outdoor
unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Check if the power supply is conform with the regulations. See
Possible cause:
▪
Faulty or disturbance of the power supply (imbalance >4%),
▪
Power drop,
▪
Short circuit.
2
Perform a check of the compressor. See
49].
Possible cause:
Faulty compressor or miswiring of the compressor power
supply cable.
