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One out of 5 or 6 times the heat exchanger will ignite and run about 60 seconds and the circulating fan will not come on.until the exhaust fan runs about 3 minutes and then it will energize

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This will be due to a finicky blower relay. Whether on a circuit board or stand alone....the blower relay will be your issue

Posted on May 11, 2010

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Don't know your specific unit, but in general, heating systems are two-stage devices:

1: Its too cold: the motorised HW/CH valve moved to the required position, and on achieving it, the circulaion pump starts and the boiler is enabled. (The circ pump may start immediately - its not usually important.) The hot water from the boiler circulates through the heat exchanger and/or radiators until the thermostat thinks its target is warm enough, whereupon it disables the boiler, stops the pump and closes/relaxes the valve(s).

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Your question doesn't say how the pump running corresponds to thee thermostat settings, but if it were stuck on, I think you'd know!

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It depends....on if you are talking about a small blower in the front of the furnace or the indoor fan motor. If your furnace is an 80% effficiency rating or above it will have a 'combustion air' fan....that will be a small on in front of the furnace in the vestibule under the front cover. If you have that motor and that is the one you are asking about...then YES it has to be running prior to the furnace igniting the gas.

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One out of 5 or 6 times the heat exchanger will ignite and run about 60 seconds and the circulating fan will not come on.until the exhaust fan runs about 3 minutes and then it will energize


Need make and model number of unit. But sounds like a limit switch. Check filters and pull and clean limit. It is located above burner. Small square plate with two wires coming off it. Rus

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