SiUS281117
Troubleshooting by Remote Controller
160
Service Diagnosis
2.41 Radiation Fin Thermistor Abnormality
Remote
Controller
Display
P4
Applicable
Models
RZR, RZQ
Method of Error
Detection
Detection by open or short circuit of the radiation fin thermistor during the compressor stops
operating.
Error Decision
Conditions
When open or short circuit of the radiation fin thermistor is detected during the compressor
stops operating
Supposed
Causes
Defective radiation fin thermistor
Defective outdoor unit PCB (A1P)
External factor (Noise, etc.)
Troubleshooting
Note:
1. Connector and indoor unit PCB
Disconnect the connector (
∗
1)
on inverter PCB, then check
the thermistor resistance at
the ordinary temperature.
Replace the outdoor unit
inverter PCB.
Is it normal?
NO
Replace the outdoor unit
inverter PCB.
Continue the operation.
Error is displayed again.
NO
YES
YES
CHECK 5
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Connector for radiation fin thermistor
PCB
X111A
A1P
CHECK 5
