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SiBE12-816_D
Troubleshooting for SA Indoor Unit - FFQ Series
Service Diagnosis
228
6.5
Thermistor or Related Abnormality
Remote
Controller
Display
The table below describes the two thermistor abnormalities.
Method of
Malfunction
Detection
Malfunction detection is carried out by the temperature detected by thermistor.
Malfunction
Decision
Conditions
When during compressor operation:
Thermistor input > 4.96 V
or
Thermistor output < 0.04 V.
Supposed
Causes
Disconnection of connector
Defective thermistor
Defective indoor unit PCB
Broken or disconnected wire
Checking
thermistors
If the cause of the problem is related to the thermistors, the thermistors should be checked prior
to changing the indoor unit PCB.
To check the thermistors, proceed as follows:
Refer to “Thermistor resistance check” on page 261 for detail.
Error
Description
C4
Defective indoor heat exchanger thermistor system
C9
Defective room temperature thermistor system
Step
Action
1
Disconnect the thermistor from the indoor unit PCB.
2
Read the temperature and the resistor value.
3
Check if the measured values correspond with the values in the table of thermistor
resistance check.
Содержание 2MKS40G2V1B
Страница 12: ...SiBE12 816_D 1 List of Functions Part 1 List of Functions 1 Functions 2 1 1 Cooling Only 2 1 2 Heat Pump 5 ...
Страница 180: ...SA Indoor Unit FFQ Series SiBE12 816_D 169 Operation Manual 2 Start 5s 5s 5s 5s 5s End ...
Страница 290: ...Outdoor Unit SiBE12 816_D 279 Removal Procedure 15 Lift and remove the electrical box Step Procedure Points R12537 ...