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I have a Coleman electric furnace Model 3400A823. The thermostat is set at 65 deg. It just keeps running after mercury switch opens. I let it run just to see what would happen, It got up to about 80 degrees, before I shut the breakers off myself. Note: While it was running I moved the setting dial from one extreme to the other, watching the mercury switch points open and close. They would arc every time they opened.

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Posted on Jan 02, 2017

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SOURCE: thermostat issue with comfort zone II.

Is this an electric or gass furnace - Eather of these can can have this problem its most recomendable that you call a seviceman .
in the case of electric furnace you may requier a new heat sequencer. And in the case of gass you may requier a new relay.

Posted on Feb 19, 2009

heatman101
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SOURCE: My coleman furnace will short

Hi,

Here is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting

heatman101


Posted on Jan 04, 2011

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I have a coleman furnace model 4066A656


Make sure your air filter is clean. Is the thermostat satisfied? or is the room temp. still below the thermostat setting? When ever you have to turn the power off and then back on to a furnace that usually indicates that the furnaces ignition control locked out. The first thing that I would try is cleaning the flame rod.

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We have a Coleman Electric Furnace Serial # AOL6042086, Model # AHP36C3XH21A and the fan runs constantly, will not shut off. We have replaced the thermostat and just replaced the control board. We h


I wish I was a furnace expert but I will give a push in the right direction. When a gas/electric fan runs it has two speeds. When you turn on the FAN ON switch it should run at the slower speed. If it doesn't turn on or turn off again when you turn it back you have a wiring problem or a thermostat problem. Make sure the thermostat is compatible with your unit and wired properly (on both ends). The other time the fan runs is "in session" when heat or cooling is applied to the system. It should run until the system finishes the cycle then a bit more (30 seconds or 1 minute) to blow the treated air completely through the ducts. If it doesn't stop then you may have a bad fan time delay or relay. Check parts for your model and various appliance repair site online.

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Make sure all vents are open and filters are clean. Likely an air flow issue but possibly, though unlikely, both switches are bad.

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Have Coleman mobile home unit electric furnace changed sequencer and limit switches strips stay on after cycle and also run with unit switched off


This is the one where you have to lay on your head to work on it, I assume? Has to either be a bad sequencer, or the thermostat/thermostat wiring. If all the strips stay on, something is miswired, or your thermostat is keeping them on.

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1 Answer

Why does my Colman EB10C electric heater start & run for a few seconds,stop, then restart & run?


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Usually when the furnace blower motor runs all the time
The limit switch or rollout switch is usually open or bad.
The furnace board is seeing that one of those switches is open, so it brings the blower on to try to get the heat out of the combustion chamber area, so the switch will close. But if the switch is bad and won’t close, the furnace board will keep the blower running continuously.

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1 Answer

Furnace blowers continues to run after reaching temp


It actually sounds like you may have answered the question yourself. If the mercury isn't breaking contact, then obviously it's still calling for more heat. This is a common problem with the old mercury thermostats and are usually replaced with digital ones that are way more accurate. The are fairly cheap at Wal-Mart and such, and replacing one is basically all color coded.

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Coleman electric furnace will not shut off keeps running when i lower the thermostat even when i trn the heat-cool-off switch to off


The contacts on your fan switch are sticking. Its time to replace the switch. To get it un-stuck, try hitting the side of the furnace when there is no call for heat from your thermostat. That should jar the contacts loose but its still a good idea to have it replaced.

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1 Answer

Thermostat issue with comfort zone II.


Is this an electric or gass furnace - Eather of these can can have this problem its most recomendable that you call a seviceman .
in the case of electric furnace you may requier a new heat sequencer. And in the case of gass you may requier a new relay.

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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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