Thermistor Abnormality - Daikin VRV RXYMQ-A Series Service Manual

Troubleshooting by Error Code

5.16 Thermistor Abnormality

Applicable All indoor unit models
Models
C4, C5, C9
Error Code
Method of Error
The error is determined by the temperature detected by the thermistor.
Detection
Error Decision
The thermistor becomes disconnected or shorted while the unit is running.
Conditions
Supposed  Defective thermistor
 Defective indoor unit PCB
Causes
 Disconnection of connector
Troubleshooting
Note(s)
Error code and thermistor
Reference
CHECK 11 Refer to page 281.
184
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Remove the thermistor from
the indoor unit PCB. Then,
insert the connector again.
Does the unit
operate normally?
NO
Remove the thermistor from
the indoor unit PCB, and then
measure the resistance of the
thermistor using a multimeter.
CHECK 11
Normal?
YES
Error Code
C4 Indoor heat exchanger liquid pipe thermistor
C5 Indoor heat exchanger gas pipe thermistor
C9 Suction air thermistor
YES
NO
Thermistor
SiME332106E
Normal (The error is caused by
defective contact.)
Replace the thermistor.
Replace the indoor unit
control PCB (A1P).
Electric Symbol
R2T
R3T
R1T
Part 6 Service Diagnosis