Thermistor Abnormality - Daikin RZQG71~140L7V1B Service Manual

ESIE12-06
4.9

Thermistor Abnormality

C4, C5, C9
Remote
Controller
Display
Applicable
All models of indoor unit
Models
Method of Error
The error is detected by temperature detected by thermistor.
Detection
Error Decision
When the thermistor becomes disconnected or shorted while the unit is running.
Conditions
Supposed  Defective connector connection
Causes  Defective thermistor
 Defective indoor unit PCB
 Broken or disconnected wire
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Check the connector connection.
Is it connected properly?
YES
Check the thermistor resistance.
CHECK 1
Is it normal?
YES
Error Code
C4
Heat exchanger thermistor
C5
Intermediate heat exchanger thermistor
C9
Suction air thermistor
CHECK 1 Refer to P.241.
Service Diagnosis
NO
NO
Defective Thermistor
Troubleshooting by Remote Controller
Correct the connection.
Replace the thermistor.
Replace the outdoor unit PCB.
Symbol
R2T
R3T
R1T
191