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Troubleshooting
Service manual
38
RXM20~71R(9) + ARXM25~71R(9) + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11B – 2022.02
Possible cause:
▪
Faulty or disturbance of the power supply (power supply MUST be within
range of nominal operating voltage ±4%),
▪
Power drop,
▪
Short circuit.
2
Perform a check of the compressor. See
Possible cause:
Faulty compressor or miswiring of the compressor power
supply cable.
3
Perform a check of the outdoor unit fan motor. See
Possible cause:
Faulty outdoor unit fan motor.
4
Perform a check of the main PCB. See
Possible cause:
Faulty main PCB.
5
Wait until the compressor restarts.
Possible cause:
▪
Momentary drop of voltage,
▪
Momentary power failure.
6
Perform a check of the indoor unit main PCB. See
106].
Possible cause:
Faulty indoor unit main PCB.
7
Perform a check of the indoor unit power PCB. See
112].
Possible cause:
Faulty indoor unit power PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
3.5.31 U4-00 – Indoor/outdoor unit communication problem
Trigger
Effect
Reset
Communication failure
between outdoor and
indoor unit.
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 compliant with the regulations. See
205].
Possible cause:
▪
Faulty or disturbance of the power supply (power supply MUST be within
range of nominal operating voltage ±4%),
▪
Power drop,
▪
Short circuit.