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Old 11-14-2017, 02:50 AM   #1
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furnace keeps blowing hot air

I have my firnace set to 65. Auto. I woke up and the temp is well over 85 inside. I turned off the furnaceabd waited a while to see if it wpuld keep doing it. And it is

Im new to living my my vlite and not sure what might be wrong with it. Any help would be appreciated
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Old 11-14-2017, 06:19 AM   #2
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Furnaces will continue too operate when the thermostat is satisfied to cool the furnace internally for a min or two.

Sounds like something is wrong with the thermostat or the wiring that is keeping the unit heating.
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Old 11-14-2017, 06:50 AM   #3
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Ok thanks. I was wanting to change it for one that i could program, but couldnt talk my wife into the need of it. It also seems that after i let it sit for a night that it is now working fine. But im still going to change it out in hopes of it not happening again.
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Old 11-14-2017, 08:02 AM   #4
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Quote:
Originally Posted by kspencer View Post
Ok thanks. I was wanting to change it for one that i could program, but couldnt talk my wife into the need of it. It also seems that after i let it sit for a night that it is now working fine. But im still going to change it out in hopes of it not happening again.
It could be that the back of the stat was getting a different reading, check the hole the wires come through when you change the stat, and plug it....
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Old 11-14-2017, 08:34 AM   #5
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On a previous trailer we had a simple 2 wire wall thermostat for the furnace.
It was the old style mechanical thermostat with the curled bi-metal coil inside.
Super simple. Off/On switch on the side.

One day after spending hours away sight seeing in Jackson Hole Wyoming- we returned to the NF no hook ups campground to find the furnace running.
Outside temps that day in the 70s. Inside the trailer it was an oven!!
Battery nearly dead- half a tank of LP gone. The smell of hot metal.
The thermostat was off.
I found the 2 wires on the back of the thermostat had been stripped way
longer than necessary and the ends were touching.
We'd towed from Kentucky with several stops along the way.
It just decided to make contact that day.... scary.
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Old 11-14-2017, 08:39 AM   #6
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I hope it's just the thermostat in your case. For me, not so lucky.
I chased it down to being a shorted circuit in the ceiling somewhere between the roof mount A.C. unit control box to the furnace. I ended up having to run a new dual lead/single wire from the furnace through the corners of a cabinet and up into the ceiling. Once in the ceiling I was able to fish the wire utilizing speaker and lighting holes to get it to the control board area in the AC unit where I tapped into the original circuit from the thermostat.
I figured it out by disconnecting the thermostat after the furnace started and it kept running. I then disconnected the 2 leads at the furnace and using a meter I Ohm'ed out the thermostat to furnace leads. That's when I confirmed they were shorted together. Then I disconnected the leads at the AC unit and was able to narrow it down to be shorted from the AC box to the furnace.
The cause is undetermined. But, it may have been a staple or a rodent are my two guesses. With no signs of rodents at the time I think it was a staple that was shot through the wire because at the time of diagnosing it I pulled the wire as hard as I could in the ceiling and the furnace clicked off once.
Good luck with your findings.
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Old 11-15-2017, 12:46 PM   #7
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@"05CrewDually": The point is that you chased down the real problem and fixed it, with ingenuity at that. Good Job
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