Table of Contents
Troubleshooting for SA Indoor Unit
6.5
Thermistor or Related Abnormality (SA Indoor Unit)
C4 , C5 , C9
Error Code
Method of Error
The temperatures detected by the thermistors determine thermistor errors.
Detection
Error Decision
The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation.
Conditions
Supposed
Causes
Troubleshooting
If the cause of the problem is related to the thermistors, the thermistors should be checked prior
to changing the indoor unit PCB.
Check No.01
To check the thermistors, proceed as follows:
Refer to P.206
C4
C5
C9
173
Disconnection of connector
Defective thermistor corresponding to the error code
Defective indoor unit PCB
Step
Action
1
Disconnect the thermistor from the indoor unit PCB.
2
Read the temperature and the resistance value.
Check if the measured values correspond with the values in the table of thermistor
3
resistance check.
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check the connection of
connectors.
Is it normal?
YES
Check No. 01
Check the thermistor resistance
value.
Is it normal?
YES
: Indoor heat exchanger thermistor 1 (liquid pipe) (R2T)
: Indoor heat exchanger thermistor 2 (R3T)
: Room temperature thermistor (R1T)
NO
NO
SiBE121123_A
Correct the connection.
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
(R14406)
Service Diagnosis
- Quick Links:
- Indoor Unit
- Specifications
- Outdoor Unit
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Troubleshooting
