well... our daughter is kinda dingy... anyway, yesterday my wife I had to run a few errands we noticed the weather was nice, so she called our daughter at home to tell her to open the windows turn the thermostat all the way up so the ac wouldn't run. We got home 5 hrs later she had turned it up all the way, BUT also set it to heat !!! Our house was like a sauna !!! Ok, so flipped it to off left the dial set to 85. It should shut off, right? nope. This am, left it on 85 moved the lever to ac. it should shut off, right? Nope, it's been 15 mins the blower is still running.Now what do I do? Up to yesterday it was working fine. I can only assume that ac/heat switch has broken,
Is there a Fan switch on the thermostat? Leaving is set to On as opposed to Auto will keep the fan running. Depending on the wiring, the blower fan is operated by a couple of devices either of which could have contacts stuck in the closed position.
you have a low voltage short your little 3-5 amp fuse is blown the fan limit switch is overiding everthing more than likely contactor shut it off at disconnect at furnace and call a tech
two are for te fan operation range the third is for high limit. there should be about 30 degrees between the fan pointers the higher one set at about 110. the last should be set at about 145. once the fan switch has engaged it will not shut off untill it gets below the low set point. for the sumer you can set the lower set point right up against the cut in pointer both at about 110. you should have no trouble then. Dont forget to set the cut out back down to about 75 or the furnace will short cycle in the winter.
i was gonna say check the fan switch....yeah it got flipped to on and not auto. DOH!
