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Service manual
38
10.3
Diagnostic chart
After energizing, no indicator is lighted and the air conditioner can’t be operated.
After energizing, the air conditioner can not be operated.
Check if AC 220V power supply outputs to indoor PCB.
Check if AC 220V exists at the primary coil of transformer.
Yes
YES
No
Check if AC 14.5V exists at the secondary coil of transformer.
Indoor PCB is defective.
Take off the secondary plug of transformer, and then check if AC
14.5V exists at the secondary coil of transformer.
No
Yes
Yes
Indoor PCB is defective.
Indoor PCB is defective.
No