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I have a coleman modulating furnace it is propane The buners seem to be corroding

Replace burners last year

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There are 2 types of burners. Atmospheric (or ribbon) type & inshot. I would imagine yours are Atmospheric...the longer type burners that protrude into the heat exchanger if they are corroding. Which also means you have an older furnace. Condensation can occur if there is not enough removal of flue gas...or... water is getting down into the burner from the flue. Have someone check the draft pressure to see if it has a proper draw when running. Coleman Evcon also made a furnace that is called a blendaire system. This system has a lower control board @ the furnace & and upper control board in a fan on the roof. The purpose of the fan was to blend air into the return from outside via roof fan to introduce fresh air in a tightly enveloped manufactured home, along with pressurizing the attic space to help keep the attic dry. If you have this type of system, your motor may be not working on the roof. Good luck!

Posted on Dec 05, 2014

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This furnace should have a diagnostic light that will give you a starting point where to look. It is located on the control board and will blink a code. If you remove the panel with the door switch on it, you will erase the code. Look for a small viewing port that looks on to the circuit board. Once you get the code, look on the wiring diagram for a explaination of the codes.

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What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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1 Answer

Hi~ i have a coleman-evcon heater in a mobile. The heater comes on when the thermosat is turned up to, say 65 from 55, then before the air blown out is even really warm, it shuts off. it runs on propane,...


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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