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

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Coleman Propane Furnace Good pilot light but feed/ignite main burner

Have a Coleman furnace that has a problem. I can light the 'standing' pilot light with the striker and after the thermocoupler heats up it stays lit. However I can no longer get the main burner to light.
I have checked power (13.2V) to unit. I have checked the thermostat ( functioning). The thermocouple works and holds a good flame.
The two white wires in the accompanying picture attach to the blue screw leads at the front of the gas valve. They are for the thermostat control.
The switch located on the mid-right side is for power. Red is 12V,blue is common, and white is return from the thermostat.
The thermocouple is at the back of the gas valve on the right side of the picture. You can see 2 tan colored leads coming from a secondary sensor control. Thermocouple itself is the copper line that screws into the valve.
Behind this thermocouple is a solenoid of sorts.

I am suspiciouc that this may be the problem since I can't seem to get the main burner to take gas but I need help to detrmine how to diagnose if this is the problem or not.

Then if it is, where do I get parts for a 20 something yr old furnace??

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  • BrianG Smith Nov 24, 2008

    Thanks for your advice.



    It was the coil /plunger valve within the gas valve itself. Not sure about what you are refering to re: transformer. Since the gas valve is millivolt based there is no step down from a 110V AC source. That may not have been clear in my posting.



    You are not allowed to rebuild them so I was able to find thru a dealer in Duncan BC, Pete's RV, a universal replacement. I have since installed it,and it works like new.

  • effie99 Dec 28, 2008

    I have no voltage at the thermostat or at the 24 V transformer. I have 120V coming in to transformer, but nothing coming out. I have also tried the man. reset, nothing to reset-switch is still "down".

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If you have a volt ohm meter take the two leads off the gas valve and ohm out the connection should have resistance for the coil. You said you have 12 volts from the thermostat white and red in the heating mode you should have minimum 26 volts. If you want to check the transformer should have 28 volts. Almost sounding like the transformer is getting weak. You can get parts for a 20 year old unit at any HVAC parts house. Try Washer Specialties here in Wichita Kansas they are on the web. Lowes even carries Transformers. Has to be rated 120 volt primary side secondary side 24 volts and 40 VAC.

Posted on Nov 24, 2008

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