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Old 11-12-2011, 12:44 AM   #1
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Lennox G26 HELP


Thanks in advance for any wisdom passed on.

I have a Lennox G26 series furnace turns off when it reaches the stage of turning the indoor blower motor on.

Diagnostic Code: 1. SLOW FLASH 2. ON

It goes through normal startup sequence, burner lights and it seems that after the indoor blower delay initiates it shuts down the gas valve and combustion air blower and the indoor blower does not turn on.

Worth mentioning - the indoor blower does work on the fan setting. Also, there was a beautiful aroma of burnt electronics possibly when arrived home. Board looks fine.

Could it be the primary limit switch and if so how difficult is it to change. Just guessing.Lennox G26 HELP-leng26.jpg

Thanks, again

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Old 11-12-2011, 01:04 AM   #2
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Lennox G26 HELP


It's the board gone bad. Anytime a board displays a normal (on) operation flash code but the furnace is not operating normally it's the board.

The "burnt electronics" says it all as well.

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Old 11-12-2011, 01:09 AM   #3
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Lennox G26 HELP


Pull that board off and look at the back of it. Pretty sure you'll see burn marks.
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Old 11-12-2011, 08:18 AM   #4
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Thanks, I will take a look.
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Old 11-12-2011, 09:42 AM   #5
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Lennox G26 HELP


very difficult to do. 4 plastic tabs will likely break when you try. cozyparts.com is a pretty reputable lennox parts guy.
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Old 11-12-2011, 01:14 PM   #6
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Thanks, Doc & Juri. Pulled the board and sure enough its scorched in between the J1 and J2 plugs. I believe the replacement part is 83M00 with some minor modifications. Found it on cozyparts.com.

One more question. Is it better to try and find a 63K8901 board or should I just get a 83M001 replacement kit.

Thanks, again guys for the help.
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Old 11-12-2011, 01:24 PM   #7
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It's usually always best to go OEM (original manufacture) replacement. That being said two days ago I replaced a control board on a Carrier furnace, using a replacement conversion board. The guys at Carrier themselves told me that the OEM was the exact same as the conversion so I saved my company $100 with the non OEM.

For the most part all you are paying for when it comes to replacement boards is the name when you go OEM. They all do the same thing and last equally as long.

And the directions are super simple with the conversions.
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Old 11-12-2011, 01:24 PM   #8
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You need the kit as the original board is not available. Not too difficult to replace. Follow the instructions CAREFULLY as the kit does several different furnaces. There is a series # at the end of your model # like -3 -5 which means series 3 or 5. Match that to the series # of instructions and you should be OK.
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Old 11-12-2011, 01:29 PM   #9
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Thanks, alot guys, for the help.
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Old 11-12-2011, 01:31 PM   #10
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Don't forget to ground yourself (touch the metal furnace cabinet) before handling the new board. And try and only handle the board by the plastic edges.

Static electricity can kill it.
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Old 11-12-2011, 01:32 PM   #11
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When you get that done come back and I will tell you how to properly maintain that unit.

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