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steve guitard 11-05-2012 11:21 AM

lennox g21q4 not starting
my heater worked a week ago, the other day i turned it on and nothing. I checked/replaced filter and cleaned what i could see. the johnson controll has a green lite "on" but the exhaust fan doesn't go on and i don't hear the ignitor clicking. the larger fan works if I put the thermostat on fan only. there is a humming sound when the thermostat is telling the heater to come on.

Marty S. 11-05-2012 11:43 AM

Could be the ignition module or inducer. Before spending any money on parts have the heat exchanger pressure tested.

ben's plumbing 11-05-2012 02:13 PM

my guess is inducer motor is stuck..or has something in it...ben sr

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