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Old 02-15-2009, 04:33 PM   #1
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Lennox 80MGF furnace-2 LED flashes


Our furnace is approx. 10 years old and lately has not been cutting in when the thermostat temp is raised.Before cleaning the flame sensor I noticed the LED on the circuit board was emitting 2 flashes rather than the usual steady single flash. Once the flame sensor was cleaned I turned the power back on and the furnace immediately started it's normal sequnce of heating.Once the house temperature had been reached the furnace cut out and would not consistantly cut in (drop of 3-4 degrees before starting up).Could the thermostat be defective ?
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Old 02-15-2009, 08:01 PM   #2
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Lennox 80MGF furnace-2 LED flashes


Post the complete model and serial #. I am a Lennox tech and work on lots of those units. There should be a code sticker on the panel to tell you what 2 flashes is. It may be not starting properly and going into a soft lockout/Watchguard mode. After an hour it will try restart. If you have an older electronic tstat that may be the problem but it seems too co-incidental. If you are looking for a new tstat I recommend the Honeywell FocusPro or the more expensive VisionPro type. Canuck Tire and HDepot have them.

Last edited by yuri; 02-15-2009 at 08:03 PM.
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Old 02-15-2009, 09:01 PM   #3
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Lennox 80MGF furnace-2 LED flashes


Hi Yuri
Thank you for the reply.The serial number is 6396B13518 .The tstat is an older Magicstat 97-4730 Rev B.

Garageman
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Old 02-15-2009, 09:03 PM   #4
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Lennox 80MGF furnace-2 LED flashes


I have had those stats fail from old age so I would replace it. I will try look up that code on Davenet but you should have a sticker for it or in the owners manual. Done/FYI 2 flashes is flame failure. Carefully remove the burners and blow them out with compressed air. Clean the face of the one that the flame sensor sits in front of with emory paper. Back to our regularly scheduled Winter in the peg. Had rain last Tuesday, that was wild and weird. Shutdown the whole TransCanada highway.

Last edited by yuri; 02-15-2009 at 09:19 PM.
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Old 02-16-2009, 06:15 AM   #5
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Lennox 80MGF furnace-2 LED flashes


2 flashes, failure to detect or sustain flame.
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Old 02-16-2009, 03:23 PM   #6
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Lennox 80MGF furnace-2 LED flashes


Thank you both for your responses !
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