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

Troubleshooting by Error Code

3.50 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
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
Troubleshooting
245
Radiation fin thermistor
Thermistor located in PCB circuit
Defective radiation fin temperature thermistor
Defective inverter PCB
Defective inverter compressor
Defective fan motor
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check in Monitor Mode
8-14 ton classes are equipped
with 2 compressors.
Check for the compressor 1 or
2 applicable to the error code
P4 while in monitor mode of
the outdoor unit PCB.
Make measurement of
resistance of the radiation fin
thermistor.
Is the
resistance of the
relevant thermistor
normal?
YES
The
insulation
resistance of the
relevant inverter compressor
is not more than
100 kΩ.
NO
The insulation
resistance of the relevant
fan motor is not more
than 1 MΩ.
NO
Turn ON
the power supply.
Does the error
recur?
NO
NO
YES
YES
YES
SiUS371614E
Replace the inverter PCB. ( 1)
1
REYQ72TA: A3P
REYQ96-168TA: A3P, A6P
Replace the compressor.
REYQ72TA: M1C
REYQ96-168TA: M1C, M2C
Replace the fan motor.
Replace the inverter PCB. ( 1)
Continue operation.
Service Diagnosis