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How old is the unit?
OK so warranty is over, putting the screw through the ribbon probably damaged the micro chip on that board, unit will be useless,
As for unit efficiency, did you find and clean dirty coils
You want to check the main voltage transformer.
Did you find the wiring diagram on the unit?
Probably find it in the unit itself on a sticker or something
Link I gave you is no good.
If you attach a clear picture of the wiring diagram I can assist you if you need it.
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