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Old 10-28-2012, 03:12 PM   #1
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Lennox MGF80 Won't Light


The furnace blower comes on and the igniter goes through 3 attempts to light then goes to lockout. I have removed the flame sensor and all six burners and cleaned them. I reinstalled them and the problem still exists. However when I remove the burner in front of the igniter, the furnace lights. I have had the gas pressure and limiter switches all check ok.

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Old 10-28-2012, 06:06 PM   #2
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Lennox MGF80 Won't Light


My manometer doesn't have a gas pressure ok reading, so i don't know what ok is.

Could have a cracked heat exchanger.


Last edited by beenthere; 10-28-2012 at 08:05 PM. Reason: spelling LOL
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Old 10-28-2012, 07:02 PM   #3
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Lennox MGF80 Won't Light


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Originally Posted by beenthere View Post
My manometer does have a gas pressure ok reading, so i don't know what ok is.

Could have a cracked heat exchanger.
hey b t iam glad you have an ok setting on your manometer...mine don't...I'll bet yours don't either ...i know what you mean....ben sr
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Old 10-28-2012, 08:05 PM   #4
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Lennox MGF80 Won't Light


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Originally Posted by ben's plumbing View Post
hey b t iam glad you have an ok setting on your manometer...mine don't...I'll bet yours don't either ...i know what you mean....ben sr
LOL. I fixed my spelling.
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