SiMT041509E
Troubleshooting
Service Diagnosis
58
4.5
Thermistor or Related Abnormality (Indoor Unit)
Error Code
C4
,
C9
Method of Error
Detection
The temperatures detected by the thermistors determine thermistor errors.
Error Decision
Conditions
The voltage between the both ends of the thermistor is 4.96 V and more or 0.04 V and less
during compressor operation.
Supposed
Causes
Disconnection of connector
Thermistor corresponding to the error code is defective.
Defective indoor unit PCB
Troubleshooting
Check No.01
Refer to P.83
C4
: Indoor heat exchanger thermistor
C9
: Room temperature thermistor
YES
(R21870)
NO
Check No. 01
Check the thermistor resistance
value.
YES
NO
Caution
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.
Summary of Contents for FTKM18PVMK
Page 16: ...SiMT041509E 1 List of Functions Part 1 List of Functions 1 Functions 2 ...
Page 18: ...SiMT041509E 3 Specifications Part 2 Specifications 1 Specifications 4 ...
Page 59: ...SiMT041509E Remote Controller 44 Part 5 Remote Controller 1 Remote Controller 45 ...
Page 118: ...Revision History Month Year Version Revised contents 07 2015 SiMT041509E First edition ...