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

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I have a Coleman furnace model number 7681-8171/b. Most everything has been replaced on this unit from the circuit board to the flame censor including the firebox which was on the recall list. The unit will sometimes work correctly but in the mornings the house temp. will only be about 60 degrees even though the Thermostat is set on 70 degrees. The flame sometimes holds and it works well but other times the flame comes on then kicks off shortly afterwards. This furnace has been nothing but problems since almost day one.

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Short of being able to look at everything Its impossible to say exactly what the trouble is. Does the board have a blink code showing and a legend that says what this is? What fuel are you on NG or LP? What does the flame look like (if you can see it) IE a lot of yellow, Some orange and Blue...?. Did anyone else look at the system and the thermostat? Does it have AC or HP on it too?

The only 1 thing I may be able to offer is this. On your thermostat (if it is not electronic) there is a needle pointer that points to a number it should be around .4 to .7 if set to a lower number the thermostat will cut the unit off well before it completes a heat cycle.

Posted on Mar 11, 2009

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