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.

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

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