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When you use a volt meter across R and C thermostat terminals on the board do you get 24 volts?
So the LED light on the board is on?
Do you have 24 volts out of the transformer? You may have a power issue to the unit itself.
I think you have a main power issue to the unit check the supply voltage
Double check the power on the line side of the transformer and the output side and see what you read
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