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I have a Lennox furnace. The pilot light is lit, but the burners do not ignite...no heat to the house as a result

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  • Mark Egan May 11, 2010

    How old of furnace is this

    Is it a standing pilot, or electronic ignition with pilot?


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You have a multitude of things it could be.From a open safety switch to a bad gas valve. I need to know what the model number is on the furnace. You can find that by opening the door where the burners and gas valve are and it should have a sticker in it giving model # and serial# . Once I have that I can help you. David- HVAC TECH

Posted on Feb 01, 2009

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Heater is not igniting


see this causes and fix it. God bless you
f there is no heat, check the electrical service panel for a burned fuse or tripped breaker. Relight the pilot light (see below). If there is not enough heat, adjust the burner air shutter (see below); and clean the burner ports (see below).
If the pilot light does not light or does not stay lit, clean the pilot orifice carefully with a toothpick, test the thermocouple and replace it if it is faulty (see below).
If the flame flickers, adjust the pilot (see below).
If there is an exploding sound when the burner ignites, adjust the pilot to a higher setting and clean the pilot orifice and the burner ports.
If the burner takes more than a few seconds to ignite, clean the pilot orifice and adjust the pilot light.
If the burner flame is uneven, clean the burner ports. If the burner flame is very yellow, clean the burner; open vents in the furnace room to provide more air; adjust the burner air shutter.
If the furnace makes a rumbling noise when the burners are off, clean the burner and adjust the burner air shutter.
If the air is too dry, wash or replace the evaporator pad if you have a humidifier; test the humidistat; and adjust the water-level float to raise the water level.
If some rooms are too cool and others too warm, the distribution system may require balancing. Refer to the Forced-Air Distribution Fix-It Guide .

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The newer systems are "smarter" and can detect more specific problems and failures. The older ones simply know that the thing didn't light, so they bring on the fans for safety.


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1 Answer

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1 Answer

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1 Answer

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