Thermistor Abnormality - Daikin RZQ Series FCQ20EVA Service Manual

Troubleshooting by Remote Controller

4.13 Thermistor Abnormality

C4, C9
Error Code
Applicable All indoor models
Models
Method of Error
The error is detected by temperature detected by thermistor.
Detection
Error Decision
When the thermistor becomes disconnected or short circuited while the unit is running.
Conditions
 Defective connector connection
Supposed
 Defective thermistor
Causes
 Defective indoor unit PCB
 Broken or disconnected wire
Troubleshooting
Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the connector connection.
Is it connected properly?
Check the thermistor resistance.
Check the contact between thermistor
and PCB.
Is the contact OK?
CHECK 1 Refer to P.152.
103
NO
YES
NO
CHECK 1
Is it normal?
YES
NO
YES
Correct the connection.
Replace the thermistor.
Correct contact.
Replace the outdoor unit PCB.
C4
: Heat exchanger thermistor (R2T)
C9
: Suction air thermistor (R1T)
Service Diagnosis
SiME281501E