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Troubleshooting by Error Code
SiUS331708EA
187
Service Diagnosis
4.22 Thermistor Abnormality
Error Code
C4, C5, C9, CA
Applicable
Models
C4, C5
: All indoor units
C9
: except FXTQ-TA and CXTQ-TA models
CA
: FXMQ-PB models only
Method of Error
Detection
The error is determined by the temperature detected by the thermistor.
Error Decision
Conditions
The thermistor becomes disconnected or shorted while the unit is running.
Supposed
Causes
Defective thermistor
Defective indoor unit PCB
Disconnection of connector
Broken or disconnected wire
Troubleshooting
Notes:
∗
1. Error code and thermistor
∗
C9
for FXTQ-TA and CXTQ-TA models.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Remove the thermistor from
the indoor unit PCB. Then,
insert the connector again.
Remove the thermistor from
the indoor unit PCB, and then
make resistance measurement
of the thermistor using a
multimeter.
CHECK 11
Normal (The error is caused by
defective contact.)
YES
NO
Replace the indoor unit main
PCB (A1P).
YES
Replace the thermistor. (
∗
1)
NO
Is the thermistor
normal?
5 to 90 k
Ω
Error Code
Thermistor
Except
FXMQ-PB,
FXTQ-TA,
CXTQ-TA
FXMQ-PB
FXTQ-TA,
CXTQ-TA
C4
Heat exchanger liquid pipe thermistor
R2T
R2T
R1T
C5
Heat exchanger gas pipe thermistor
R3T
R3T
R2T
C9
Suction air thermistor
R1T
R1T
∗
2
CA
Discharge air thermistor
—
R4T
—
CHECK 11
Summary of Contents for RXSQ24TAVJU
Page 1: ...Service Manual SiUS331708EA RXSQ24 36 48 60TAVJU Heat Pump 60 Hz...
Page 290: ...Wiring Diagrams SiUS331708EA 277 Appendix RXSQ48TAVJU 3D109546A...
Page 291: ...SiUS331708EA Wiring Diagrams Appendix 278 RXSQ60TAVJU 3D109547A...
Page 295: ...SiUS331708EA Wiring Diagrams Appendix 282 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 298: ...Wiring Diagrams SiUS331708EA 285 Appendix FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 300: ...Wiring Diagrams SiUS331708EA 287 Appendix FXSQ05 07 09 12 15 18 24 30 36 48 54TAVJU 3D110467B...
Page 301: ...SiUS331708EA Wiring Diagrams Appendix 288 FXMQ07 09 12 15 18 24 30 36 48 54PBVJU 3D093209B...
Page 302: ...Wiring Diagrams SiUS331708EA 289 Appendix FXHQ12 24 36MVJU 3D048116C...
Page 303: ...SiUS331708EA Wiring Diagrams Appendix 290 FXAQ07 09 12 18 24PVJU 3D075354C...
Page 309: ...SiUS331708EA Wiring Diagrams Appendix 296 VAM1200GVJU 3D073270D...