Question about Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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Coleman Evcon furnace, blower runs continuously even after the temp has been reached.

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Make sure the thermostat is in the auto mode if so it is more than likely the fan relay control some are built on the board some can be replaced separately

Posted on Dec 17, 2008

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I have a coleman evcon electric furnace. The blower fan runs constantly, the switch is in auto and the fans runs even when the thermostat is shut off.


Most likely on that particular electric furnace you have a fan sequencer that is closed (stuck shut). It is the black relay that you are looking at when you take off the furnace cover to access your heat strips. You should have a red wire coming from the blower motor that plugs into the side of it. If you have a ohm meter turn power off and remove wire. Check resistance across the sequencer and it should read OL. If you have resistance across it, the relay is bad. Replace it.

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I have a Coleman Evcon gas (propane) furnace. When the t-stat is switched to heat the furnace heats up but the blower will never turn on. The unit then shuts down and tries to cycle again. I have replaced...


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This sounds like a bad heat exchanger. It is possible that you do not see the crack because the crack is closed when the heat exchanger is cold (or room temp). Allow the furnace to heat up, this will allow the expansion of the crack. Turn the power off and examine the heat exchanger while it is still hot.

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first off buy yourself a honeywell stat, in my personal opinion lux stats are garbage, I have run into so many that are bad stats !!! but as far as your fan not shuting down, sounds to me like your fan center on your circuit board is bad and will not shut down the fan when needed, you will have to replace the circuit board, as the fan center is a part of the whole of the circuit board, hope that helps

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Looks like 4 flashes might be high limit fault on this furnace. (I don't have a manual for this furnace, just searched online for the code meaning) Is the unit running flame at all? Is the unit running flame for a while then shutting flame off before desired temp is reached? Does the main air fan turn on to circulate air through your diffusers? Does it feel like the unit has much air flow out of the diffusers if the fan is running? Is your air filter clean? If it is infact your high limit switch, it is usually caused by not having enough airflow through the furnace and overheating occurs.

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1 Answer

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Small blower motor? Are you talking about the combustion blower if so then check your vents for blockage.. if the vents are blocked won't work... if it has a control board init it will give you a diagnostic code. Flashing light on the board... count the flashes and look up the fault on the chart in your owners manual ot on the furnace door..

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1 Answer

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There are a few reasons why your furnace is restarting after it reaches temp. and shuts off. First, if you have a mercury bulb thermostat it needs to be level and the heat anticipator needs set properly. If you have an electronic thermostat then you need to make sure the DIP switch settings inside are set properly for propane. If you have a digital thermostat there are also settings to be made for your type of heating. These settings will be explained in the thermostat installation instructions. Also, Make sure your furnace filter is clean. If this does not help then there are some other things to check which may need to be done by a technician depending on your mechanical aptitude. Hope this helps!

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1 Answer

Coleman furnace blower runs continuously


You should be seeing 120 volts to the igniter. Anything less requires either a replacement of the transformer, start relay or control module.

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