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-   -   Lennox G40UH-48B furnace burners failed to light (http://www.diychatroom.com/f17/lennox-g40uh-48b-furnace-burners-failed-light-120859/)

PAULROB1 10-21-2011 06:43 PM

Lennox G40UH-48B furnace burners failed to light
 
LED trouble code is "burners failed to light" but they do light and burn for 30 seconds then a click and they shut off. Cycle repeats 4 times and then lock out. I replaced the return air filters and flame sensor with no change. Both fans run fine.

beenthere 10-21-2011 08:05 PM

Could be a poor ground.

JJboy 10-21-2011 08:20 PM

check the service manual ==> http://www.google.com/url?sa=t&rct=j...476QDA&cad=rja

You can try to clean the burn and check the igniter


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