Troubleshooting SiUS04-904
Service Diagnosis 101
Troubleshooting
Check No.06
Refer to P.146
NO
NO
NO
Check No. 06
Indoor unit heat exchanger
thermistor check
YES
YES
(R7131)
YES
YES
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
Provide sufficient air passage.
Clean the air filter.
Clean the heat exchanger.
Replace the indoor unit PCB.
Replace the thermistor
(replace the indoor unit PCB).
Does it
conform to the
thermistor characteristic
chart?
Check the intake air filter.
Check the dust accumulation on
the indoor unit heat exchanger.
Is there any short-circuit?
Is it very dirty?
Is it very dirty?
Check the air passage.
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