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Heil DC90 gas furnace need to find reset or limit switch

I have a heat exchanger problem and no money for repairs until Jan. Short term solution is to hit rest(limit) switch. Cannot locate switch.

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Posted on Jan 02, 2017

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Therinnaiguy
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SOURCE: i have an older model heil quaker natural gas

Test to make sure the limit switch is still working prior to the rewire. Use an Ohm meter and test for continuity. If good, use some good quality 14 or 12 guage wire to rewire. If the unit has an in-line fuse, you will need to replace that as well.

Posted on Mar 27, 2010

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SOURCE: I have a heil dc90 furnace wondering what the

lpg is 12 to 14 inches wc nat gas is 4 inches wc ,

Posted on Feb 02, 2011

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Tempstar DC90 pilot light or burner keeps going out. The furnace will run continuously. Even if I turn heat off at the thermostat. I have to kill power at the panel box to get it to shut off. Then I've...


The reset button near the ignitor is a high temperature limit safety switch. When the furnace gets too hot and the manual reset limit switch is tripped, it most likely goes into a 'safe' mode where the gas control is locked out electronically and the blower is made to run continuously to rid the heat exchanger of the excessive heat. This will continue until the reset is pushed and the power is cycled off. It will remain an endless cycle unless the reason for the overtemperature condition is not corrected.

Your furnace 'temperature rise' is getting too high due to a lack of air across the heat exchanger for whatever reason. Some of those reasons could be a restricted air filter or a blower motor that's cycling improperly on its internal winding thermostat. You could also have a dirty air conditioner 'A' coil (evaporator) on top of the furnace restricting the air flow. Nevertheless, you are going to have to have it serviced by a reputable service company's technician to correct what's wrong.

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None of these products are used INSIDE the heat exchanger. If the problem is a cracked heat exchanger, you may be able tp purchase replacement parts to repair it

How to Fix Cracked Furnace Heat Exchanger DoItYourself com


The heat exchanger must be free of cracks and holes due to the potential of carbon monoxide leakage. You can probably make a short term repair with sheet metal and high heat furnace refractory cement, but that is a quick fix only.
Please be aware of the potential for a lethal situation due to carbon monoxide poisoning.

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1 Answer

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If the sensor knocks the unit off and the the fan keeps blowing without a flame ,the limit (the sensor is a limit comptroller that turns off flame @ a set temp and allows the fan to run until the heat exchanger cools to @ set temp) has out lived its lifetime and needs to be replaced.the button is a manual reset that once reset would allow the unit to continue to run flame and blower at the same time after having been set once, if it is an ongoing problem and needs to be reset more than once then replace the limit control (sensor) in kind. (With the same mode and set-points for the limits)

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1 Answer

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A few questions for you. If the thermostat is satisfied as in turned below room temp, does the blower shut off. Are the filters clean? Furnaces have a limit control that governs how hot the heat exchanger runs. If the limit switch opens for some reason the fan or blower will continue to run until the limit switch closes. So dirty filters? A very dirty blower wheel? A blower motor that is not coming up to speed, Could just be a bad limit switch that is opening up at a lower temperature than it should. I would also check the pressure switch sensing tube. The end could be blocked with deposits

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My Dayton NG furnace runs a couple minutes thens shuts down There is a fault code #4 after the burner shuts down Appears to be 3 limit switches, Can I checkeck these with an ohmeter as it is running to...


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The gas valve is bad and this is a common problem for these furnnaces. I have the same problem. Let me guess its a DC90?

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Yes. If the high limit is tripped, the furnace will bring on the fan continuously until the limit resets. Often, they will not reset if tripped repeatedly. If the furnace is too large for your application, you probably are not able to move enough air to keep the heat exchanger cool enough.

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