C4-00 - Heat Exchanger Temperature Sensor Problem; C9-00 - Room Thermistor Abnormality - Daikin RXM20R Service Manual

3 | Troubleshooting
3.5.5 C4-00 – Heat exchanger temperature sensor problem
3.5.6 C9-00 – Room thermistor abnormality
Service manual
20
Trigger
Refrigerant liquid
thermistor detects an
open or short circuit
during compressor
operation.
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
"4.19 Thermistors" [
Possible cause: Faulty indoor unit heat exchanger thermistor.
2 Perform a check of the indoor unit main PCB. See
4
PCB" [ 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.
Trigger
Resistance value is out of
range. Temperature
measured <–43.6°C or
>90°C.
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
"4.19 Thermistors" [
Possible cause: Faulty indoor unit air (room) thermistor.
2 Perform a check of the indoor unit main PCB. See
4
PCB" [ 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.
Effect
Unit will stop operating.
4 192].
Effect
Unit will stop operating.
4
192].
RXM20~71R(9) + ARXM25~71R(9) + FTXM20~71R + ATXM25~50R +
Reset
Power reset.
"4.9 Indoor unit main
Reset
Automatic reset when
resistance is within range.
"4.9 Indoor unit main
FVXM25~50A
Split New Perfera R32
ESIE20-11B – 2022.02