ESIE15-13B Troubleshooting by Remote Controller
Service Diagnosis 131
4.9 Thermistor Abnormality
Remote
Controller
Display
C4, C5, C9
Applicable
Models
All models of indoor unit
Method of Error
Detection
The error is detected by temperature detected by thermistor.
Error Decision
Conditions
When the thermistor becomes disconnected or shorted while the unit is running.
Supposed
Causes
Defective connector connection
Defective thermistor
Defective indoor unit PCB
Broken or disconnected wire
Troubleshooting
Refer to P.185.
Error Code Defective Thermistor Symbol
C4
Heat exchanger thermistor R2T
C5
Intermediate heat exchanger thermistor R3T
C9
Suction air thermistor R1T
Correct the connection.
Is it connected properly?
Replace the outdoor unit PCB.
NO
YES
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Check the connector connection.
Check the thermistor resistance.
YES
Replace the thermistor.
Is it normal?
NO
CHECK 1
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