re: why the hell won't my AC work? fixed, thanksPosted by NWLATigerfan on 7/25/13 at 8:23 pm to TH03
ok. take blower door off and verify that there is a light on board and that it is not burning. also with door off push in door switch on unit, and look at board to see if light is on. possible you can not see light thru window in door. If light is not on with button pushed in or door on correctly then we have a voltage problem on primary side. I know you said you reset breakers. Possible burned black wire (hot) at breaker, burned white (neutral wire) on lug, both inside panel. possible bad breaker. also should be a light switch in attic that kills power to furnace. cant tell you how many homeowners go in their attic and flip it thinking it is a light and leave off and call me.
if this is a gas furnace circuit board will be mounted in plain view to squirrel cage blower unit. circuit board should have a red or possibly green diagnostic light on board. also a 3 amp car fuse to protect board