Troubleshooting SiBE04-624
150 Service Diagnosis
2.7 Indoor Unit PCB Fault
Remote
Controller Display
A1
Method of
Malfunction
Detection
Check zero-cross detection from the power supply of the indoor unit
Malfunction
Decision
Conditions
When no zero-cross detection is performed in approximately 10 continuous seconds
Supposed
Causes
Defective indoor unit PCB (Faulty EEPROM data)
Improper connector connection
Defective indoor terminal board
Troubleshooting
Note:
Between terminal board and indoor control PCB.
Replace indoor control PCB
(A1P).
Replace indoor control PCB
(A1P).
(R6001)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Complete
Check the model names of indoor
and outdoor unit for correct
combination
Check connector connection
(Note)
Correct connection
Is it OK?
YES
YES
NO
NO
Is the fault repeated?
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