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Old 06-30-2013, 08:25 PM   #1
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Furnace turning on and off when 80


Furnace is set at 60 degrees since we live int he mountains.

The Furnace turned off when it is 80 in the house. It would turn on for 5 min and then turn off.

I did leave the attic access open and it seems to be fine. Was the furnace getting to warm? What could cause a furnace tot turn on at 80 when set at 60 or even turned off?

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Old 07-01-2013, 05:34 AM   #2
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Furnace turning on and off when 80


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Old 07-01-2013, 06:47 AM   #3
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Furnace turning on and off when 80


Is the furnace actually lighting and going thru a normal heat cycle or is the blower fan coming on only.

If it is the latter, it is because the temperature in the attic is warming the blower limit switch hot enough to close the circuit. Turn the power off to the unit.
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Old 07-01-2013, 09:28 AM   #4
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Furnace turning on and off when 80


Danpik,
We did turn off the gas to the unit. How do you turn the furnace off? Unplug it?
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Old 07-01-2013, 10:15 AM   #5
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Furnace turning on and off when 80


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Danpik,
We did turn off the gas to the unit. How do you turn the furnace off? Unplug it?
I don't know of any furnace that plugs into a wall outlet, but yea, that would be a way. There is usually a kill switch either right on the furnace itself or somewhere close at the top or bottom of stairs, on ceiling, wall, usually has a red color switch plate that says furnace on it, or it may just have a regular switch plate cover with the words furnace on/off or emergency shutoff written on it, etc.

You can also trace the electrical wires see where they go. If you just have one electrical wire (usually a BX silver looking cable) going to the furnace, then you will probably have to shut it off at the main breaker panel. If there are a couple of wires then one probably goes to an emergency kill switch somewhere mentioned above. Make sure that switch is in the off position, that should turn the power off to your furnace.

Can you post a pic?, maybe we can help you identify where it is if your still having problems locating it.

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Old 07-01-2013, 10:50 AM   #6
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Furnace turning on and off when 80


Thermostat would be the first thing to look at.
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Old 07-01-2013, 01:04 PM   #7
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Furnace turning on and off when 80


Our gas stove has a temperature sensor switch which controls the blower. Even with the gas off, it is possible that the switch will see a high enough temperature in the stove for it to turn on the blower. Remove the power from the unit.
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Old 07-01-2013, 03:00 PM   #8
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Furnace turning on and off when 80


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Our gas stove has a temperature sensor switch which controls the blower. Even with the gas off, it is possible that the switch will see a high enough temperature in the stove for it to turn on the blower. Remove the power from the unit.
What in the world does that have to do with the OP problem? The answer is nothing.
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Old 07-01-2013, 03:17 PM   #9
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Furnace turning on and off when 80


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What in the world does that have to do with the OP problem? The answer is nothing.
Everything, did you read the posts?

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Danpik,
We did turn off the gas to the unit. How do you turn the furnace off? Unplug it?

The gas is turned off to the furnace. The blower is coming on.
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Old 07-01-2013, 03:22 PM   #10
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Furnace turning on and off when 80


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Originally Posted by 47_47

Everything, did you read the posts?

Post 4
Danpik,
We did turn off the gas to the unit. How do you turn the furnace off? Unplug it?

The gas is turned off to the furnace. The blower is coming on.
Again a stove and furnace are two different things. One has nothing to do with the other.

The problem is with their thermostat most likely, but can also be caused by something else.

You posting
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Old 07-01-2013, 04:43 PM   #11
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Furnace turning on and off when 80


Quote:
Originally Posted by jvadurro View Post
Furnace is set at 60 degrees since we live int he mountains.

The Furnace turned off when it is 80 in the house. It would turn on for 5 min and then turn off.

I did leave the attic access open and it seems to be fine. Was the furnace getting to warm? What could cause a furnace tot turn on at 80 when set at 60 or even turned off?
Its possible the fan limit switch is turning the fan on, because it is getting warm/hot enough to. It could also be that the fan switch is getting weak.

Just guessing its the fan only coming on.
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Old 07-01-2013, 04:54 PM   #12
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Furnace turning on and off when 80


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Originally Posted by gregzoll View Post
Again a stove and furnace are two different things. One has nothing to do with the other.

The problem is with their thermostat most likely, but can also be caused by something else.

You posting
It may be a matter of semantics. The term stove can refer to a furnace depending on the area you live in, how old you are or what you were taught. While confusing, he obviously isn't talking about his stove because I don't know any stove that has a blower on it except for a convection oven and that is an entirely different thing.

To the OP, if your unit is installed in the attic it is definitely possible to accumulate enough heat on a warm day to turn on your temperature sensitive fan switch. If the unit doesn't go through a heating cycle and/or ignites the burner the thermostat is not the culprit unless there is a short in the fan switch on the thermostat itself. Best way to eliminate the thermostat as the cause of the problem is to take the thermostat off the base and see if the problem stops or continues. If it continues then I would say it is your fan switch turning on the blower and killing the power to the unit will solve the problem during the hot months.
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Old 07-01-2013, 05:55 PM   #13
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Furnace turning on and off when 80


Maybe if I was 200 years old, the term stove be used for a multi-purpose appliance, for heating and cooling.

Also fixing it, not just shutting power off to the device helps. Especially with the fact Winter comes quicker if you are high up in the moutains than most of us at lower elevations.
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Old 07-01-2013, 06:34 PM   #14
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Furnace turning on and off when 80


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Maybe if I was 200 years old, the term stove be used for a multi-purpose appliance, for heating and cooling.
I live in Pennsylvania. I am guessing that you never dealt with the Pennsylvania Dutch. Some of them say stove and mean heater. Insisting that it is wrong doesn't mean that other people do not use it that way.

Quote:
Also fixing it, not just shutting power off to the device helps. Especially with the fact Winter comes quicker if you are high up in the moutains than most of us at lower elevations.
Right. Fixing it is indeed the right thing to do. At the moment we are kind flying blind. We don't know if the attic has adequate ventilation. We don't have the advantage of being there so we can use our experience to troubleshoot the problem. We don't know if it is the thermostat. We don't know if it is a faulty fan switch. We don't know if the burner is coming on. We don't know a lot of things, so figuring out what the problem is first will help.
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Old 07-01-2013, 06:45 PM   #15
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Furnace turning on and off when 80


The Pennsylvania Dutch?

Auk now. Throw the cow over the fence some hay.

Make the light out.

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