Troubleshooting DAMA-SM-21-001
63 Service Diagnosis
4.6 Thermistor or Related Abnormality (Indoor Unit)
Error Code C9
Description Indoor Heat Exchange Thermistor Short/Open.
Method of Error
Detection
The temperature detected by the thermistors determine thermistor errors.
Error Decision
Conditions
The resistance of the thermistor is out of range (0 Ω or ∞ Ω)
Supposed
Causes
Disconnection of connector
Defective thermistor(s)
Defective indoor unit PCB
Troubleshooting
C9 : Room temperature thermistor
Check No.01 Refer to P.65
When replacing the defective thermistor(s), replace the thermistor as ASSY.
YES
NO
Check No. 01
Check the thermistor resistance
value.
YES
NO
Correct the connection.
Replace the defective
thermistor.
Replace the indoor unit PCB
(control PCB).
Normal?
Normal?
Check the connection of
connectors.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
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