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Troubleshooting
Service manual
20
RXM20~71R(9) + ARXM25~71R(9) + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11B – 2022.02
3.5.5 C4-00 – Heat exchanger temperature sensor problem
Trigger
Effect
Reset
Refrigerant liquid
thermistor detects an
open or short circuit
during compressor
operation.
Unit will stop operating.
Power reset.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Perform a check of the indoor unit heat exchanger thermistor. See
Possible cause:
Faulty indoor unit heat exchanger thermistor.
2
Perform a check of the indoor unit main PCB. See
106].
Possible cause:
Faulty indoor unit main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
3.5.6 C9-00 – Room thermistor abnormality
Trigger
Effect
Reset
Resistance value is out of
range. Temperature
measured <–43.6°C or
>90°C.
Unit will stop operating.
Automatic reset when
resistance is within range.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Perform a check of the indoor unit air (room) thermistor. See
Possible cause:
Faulty indoor unit air (room) thermistor.
2
Perform a check of the indoor unit main PCB. See
106].
Possible cause:
Faulty indoor unit main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
