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Old 04-03-2011, 06:47 PM   #1
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Lennox Furnace


We have a Lennox G 2003/4E-100-3 Furnace. The problem we are having is that the pilot lights, the burners light, the blower comes on just like normal. But after a few minutes of running, the burners starts cutting in and out repeatedly.

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Old 04-03-2011, 06:59 PM   #2
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Change your air filter lately? May be overheating. May sure all your vents are open.

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Old 04-03-2011, 07:06 PM   #3
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filter was changed this morning and all the vents are open
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Old 04-03-2011, 07:24 PM   #4
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May want to call an experienced Lennox tech. The heat exchanger may be cracked and opening up after it heats up. Not an easy furnace to troubleshoot if you don't have LOTS of experience with them. Not something I can walk you thru over the net.
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