Troubleshooting by Error Code
SiUS341802E
193
Service Diagnosis
2.18 Thermistor Abnormality
Error Code
C4, C5, C9, CA
Applicable
Models
C4, C5
: All indoor units
C9
: except FXTQ-TA models
CA
: FXMQ-PB models only
Method of Error
Detection
The error is detected by temperature detected by thermistor.
Error Decision
Conditions
The thermistor becomes disconnected or shorted while the unit is running.
Supposed
Causes
Defective thermistor
Defective indoor unit PCB
Defective connector connection
Broken or disconnected wire
Troubleshooting
Notes:
∗
1. Error code and thermistor
∗
C9
for FXTQ-TA models
Is the
thermistor normal?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
5 k
Ω
to 90 k
Ω
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.
Normal (The error is caused by
defective contact.)
YES
NO
Replace the indoor unit main
PCB (A1P).
YES
Replace the thermistor (
∗
1).
NO
CHECK 11
Error Code
Thermistor
Except
FXMQ-PB and
FXTQ-TA
FXMQ-PB
FXTQ-TA
C4
Indoor heat exchanger liquid pipe thermistor
R2T
R2T
R2T
C5
Indoor heat exchanger gas pipe thermistor
R3T
R3T
R3T
C9
Suction air thermistor
R1T
R1T
∗
2
CA
Discharge air thermistor
—
R4T
—
CHECK 11
Содержание Aurora Series
Страница 316: ...Wiring Diagrams SiUS341802E 303 Appendix 1 Wiring Diagrams 1 1 Outdoor Unit RXLQ72TATJU 2D112580A ...
Страница 317: ...SiUS341802E Wiring Diagrams Appendix 304 RXLQ96 120TATJU 2D112581A ...
Страница 318: ...Wiring Diagrams SiUS341802E 305 Appendix RXLQ72TAYDU 2D112582A ...
Страница 319: ...SiUS341802E Wiring Diagrams Appendix 306 RXLQ96 120TAYDU 2D112583A ...
Страница 320: ...Wiring Diagrams SiUS341802E 307 Appendix RXLQ72 96 120TAYCU RXYQ72 96 120 144 168TAYCU 2D112579A ...
Страница 330: ...Wiring Diagrams SiUS341802E 317 Appendix 1 3 2 Energy Recovery Ventilator VAM Series VAM300 470 600GVJU 3D073269C ...
Страница 331: ...SiUS341802E Wiring Diagrams Appendix 318 VAM1200GVJU 3D073270C ...
Страница 332: ...Revision History Month Year Version Revised contents 04 2018 SiUS341802E First edition ...