Specifications

SiBE341027 Troubleshooting by Remote Controller
Service Diagnosis 147
2.27 Inverter Radiation Fin Temperature Abnormality
Remote
Controller
Display
P4
Applicable
Models
RQYQ-PY1B
Method of Error
Detection
Resistance of radiation fin thermistor is detected during the compressor stops.
Error Decision
Conditions
When the resistance value of thermistor becomes a value equivalent to open or short circuited
status.
★
Error is not decided while the unit operation is continued.
"
P4
" will be displayed by pressing the inspection button.
Supposed
Causes

Defective radiation fin thermistor

Defective inverter PCB

Defective inverter compressor

Defective fan motor
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
NO
Replace the inverter
PCB.
Measure resistance value of
the radiation fin thermistor.
Is the thermistor
resistance value
normal?
The INV.
compressor's
insulation resistance
is not more than
100k
Ω
.
The fan motor's
insulation resistance
is not more than
1M
Ω
.
Does the error recur
when the power
supply turns ON?
YES
YES
NO
YES
YES
NO
NO
Replace the INV.
compressor (M1C).
Replace the fan motor.
Replace the INV. PCB.
Continue the operation.