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My furnace is in a 1994 manufactured home. It is

My furnace is in a 1994 manufactured home. It is a Coleman Evcon 7900/D series. On several recent occasions when the house has become cold even though the thermostat is turned up above room temp, I have found the following situation: When the thermostat calls for heat, the small ventilation / purge fan comes on, after a short period the glow plug or igniter starts and becomes bright orange, then the main gas valve opens and the main buner lights as would appear to be normal, however after about one minute, when the main blower should come on, the control panel clicks about twice and the gas valve shuts off and the fire goes out. After that the same sequence repeats itself over and over, with the main burner shutting off before the main blower comes on. The small ventilation fan is running all the time while this is going on. The way I have been able to get the unit running as it should is by rapping on or slapping the various components, resetting the thermostat, and everything seems to work normally for a while. I have carefully checked all visible wire connections and they are all clean and tight. I thank you very much for any ideas that you might have that will help me determine which component is intermittently malfunctioning.

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I think it is your fan because when it is supposed to come on (when hood is hot enough) it won't,...and when the gas valve doesn't get the o.k. from the fan that it is working, the unit will shut it self off so it doesn't over heat. Gas boilers and furnaces have alot of safety things like this,....see if the fan has an oiling place on it. I've seen control panels cause this too,....replace whatever is cheapest first. good luck

Posted on Jan 31, 2010

Testimonial: "Thank you very much for your response. That makes sense and narrows it down. I will keep an eye on it. The fan motor when running is quiet & smooth"

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