Troubleshooting by Error Code SiAF332111E
220 Part 6 Service Diagnosis
5.16 Thermistor Abnormality
Applicable
Models
All indoor unit models
Error Code C4, C5, C9
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
Troubleshooting
Error code and thermistor
CHECK 11 Refer to page 350.
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
measure the resistance of the
thermistor using a multimeter.
CHECK 11
Normal (The error is caused by
defective contact.)
YES
NO
Replace the indoor unit
control PCB (A1P).
YES
Replace the thermistor.
NO
Does the unit
operate normally?
Normal?
Error Code Thermistor Electric Symbol
C4 Indoor heat exchanger liquid pipe thermistor R2T
C5 Indoor heat exchanger gas pipe thermistor R3T
C9 Suction air thermistor R1T
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