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Old 11-05-2012, 11:21 AM   #1
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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.

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Old 11-05-2012, 11:43 AM   #2
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lennox g21q4 not starting


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

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Old 11-05-2012, 02:13 PM   #3
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lennox g21q4 not starting


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