Mom's 3 year old is misbehaving. I turn on the thermostat and hear a click but the DI motor Does not come on or the ignitor as usual. The board is doing 3 blinks. When I checked the manual it says open DI switch, DI goes constantly. The dang DI(draft inducer) motor does not run at all. All the rollouts are good and the safety. I have the schematic and manual. Everything points towards a bad board. Have I overlooked anything?