Thermistor Abnormality - Daikin VRV-WIII RWEYQ72PTJU Service Manual

SiUS30-1301

3.11 Thermistor Abnormality

C4, C5, 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 shorted while the unit is running.
Conditions
 Defective thermistor
Supposed
 Defective indoor unit PCB
Causes
 Defective connector connection
 Broken or disconnected wire
Troubleshooting
1. Error code and thermistor
Note:
Service Diagnosis
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, and then
insert it again.
Is the
thermistor normal?
NO
Remove the thermistor from
the indoor unit PCB, and then
make resistance measurement
of the thermistor using a
multiple meter.
5 kΩ to 90 kΩ
CHECK 11
YES
Error Code
C4
Heat exchanger liquid pipe thermistor
C5
Heat exchanger gas pipe thermistor
C9
Suction air thermistor
CHECK 11 Refer to P.250.
Troubleshooting by Indication on the Remote Controller
YES
NO
Thermistor
Normal (The error is caused by
defective contact.)
Replace the thermistor (∗1).
Replace the indoor unit PCB.
Except FXTQ FXTQ
R2T R1T
R3T R2T
R1T —
173