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Troubleshooting
SiBE04-101
94
Service Diagnosis
4.7Operation Halt Due to Detection of Thermistor or Related Abnormality
Remote Controller
Display
C4, C9, CA
Indoor unit LED
Display
Method of
Malfunction
Detection
The temperatures detected by the thermistors are used to determine thermistor errors.
Malfunction
Decision
Conditions
When the thermistor input is more than 4.96 V or less than 0.04 V during compressor operation
∗
.
∗
(reference)
When above about 212˚C (less than 120 ohms) or below about -50˚C (more than 1,860 kohms).
Note:
The values vary slightly in some models.
Supposed Causes
Faulty connector connection
Faulty thermistor
Faulty PCB
Troubleshooting
Check No.1
Refer to P.119
C4
: Heat exchanger temperature thermistor
C9
: Suction air thermistor
CA
: Discharge air thermistor
Check the connector connection.
YES
Correct the connection.
Replace the thermistor.
(Replace the indoor unit
PCB(1).)
Replace the indoor unit PCB(1).
Is it normal?
Is it normal?
(R1054)
NO
Check No. 1
Thermistor resistance check
YES
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
SiBE04-101.book Page 94 Monday, October 15, 2001 3:08 PM