Midea MSH-21HRN1-QB8, Руководство по обслуживанию

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Service manual
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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