Inverter Radiation Fin Temperature Abnormality - Daikin RXYQ-TA Series Service Manual

Troubleshooting by Error Code

3.52 Inverter Radiation Fin Temperature Abnormality

P4
Error Code
Applicable
All outdoor unit models
Models
Method of Error
Detect the resistance of the following thermistors during the compressor stops running:
Detection (1) Radiation fin thermistor.
(2) Thermistor located in PCB circuit.
(3) Heat sink thermistor.
Error Decision
When the resistance of the thermistor comes to a value equivalent to open or short circuit.
Conditions
Error is not decided while the unit operation is continued.
P4 will be displayed by pressing the inspection button.
Supposed
Causes
257
Defective radiation fin temperature thermistor
Defective inverter PCB
Defective inverter compressor
Defective fan motor
SiUS341615E
Service Diagnosis