Daikin RXQ12AHR Service Manual page 264

Troubleshooting by Error Code
Troubleshooting  Subcode P4-01, 04, 05, 06, 07, 08
 Subcode P4-02, 03, 15, 16, 17, 18
258
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check in Monitor Mode
For the models equipped with
2 compressors, check the
compressor M1C or M2C
applicable to the error code
P4 while in monitor mode of
the outdoor unit.
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
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
The insulation
YES
resistance of the
relevant fan motor is
less than 1 MΩ.
NO
Turn ON
YES
the power supply.
Does the error recur?
NO
NO
YES
YES
YES
SiAF341904E
Replace the inverter PCB. (#1)
#1
RXQ6-14A: A3P
RXQ16-20A: A3P, A6P
Replace the compressor.
RXQ6-14A: M1C
RXQ16-20A: M1C, M2C
Replace the fan motor.
Replace the inverter PCB. (#1)
Continue operation.
Replace the fan motor.
Replace the relevant fan
PCB.
RXQ6-12A: A4P
RXQ14-20A: A4P, A7P
Continue operation.
Part 6 Service Diagnosis