I have a tempstar furnace that is also hooked up to my air conditioning unit. They are ran by one thermostat. Woke up this mornig and neither are kicking on. It has an electric ignitor that isn't even coming on. Air conditioner isn't working either. I changed batteries in thermostat. STill not working

Check power, breaker and fuses at the furnace

Is there a fuse in the circuit board? Check that also,, make sure the door/cover is on tight

I was playing with the thermostat turning the furnace off and on. On the third time the thermostat clicked really loudly and then the furnace kicked on. I turned it off, it clicked and turned off. I turned it back on, it clicked again and kicked on. I guess I have to change the thermostat.