Everything is off. I can't turn it back on to save my life. The central air doesn't work, the heat doesn't work, the fan doesn't work, I tried turning offf the circuit breaker for 3 min. I checked the thermostat, I checked the batteries in the thermostat. It like the system is locked or not getting any power.

Did you check the little plug - in fuse that `s in the circuit board? Is the door/cover on the furnace?

U need a multi-meter, to check for power start at the start ,the power 1st ties to the airhandler,check the transformer,, is power going into it? If so is there power /low voltage coming out of the transformer

Tell us more and let us know

did you check the little plug - in fuse that `s in the circuit board? Is the door/cover on the furnace?

u need a multi-meter,,to check for power start at the start ,the power 1st ties to the airhandler,check the transformer,,,is power going into it? if so is there power /low voltage coming out of the transformer

tell us more and let us know

Where is the fuse and the circuit board?

where is the fuse and the circuit board?

Do I have to unscrew something?