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Heating & Air Conditioning
upup_and_away

bad hvac board??

8 years ago

When i replaced the thermostat, somewhere i messed up the board- I put the original thermostat that worked back - no go.

Looking at the unit board, no LEDs. It is getting 240v into the board and puts out from the stepdown trans 24v. The board hums.

I have another board laying around same that i tried- still no LED. What am i missing? did the spare board also go bad or do i need to check something else on the board.

The board is a LENNOX SureLight 50A65-120-04 FWIW.

TIA

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