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Old 12-09-2009, 11:41 AM   #1
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Need help with a Lennox Furnace

Hello Everyone, I hope someone can help me with this.

I have a Lennox furnace model# G23Q2/3 - 75 - 1. It is 16 years old.(date code 9-93)

I had a problem with the blower not coming on when the furnace fired up. After some research and reading a lot of info on this forum I figured it was the relay. On this furnace you have to replace the BCC. I bought and installed the new board and everything starts up as normal. Now when the house warms up and the furnace shuts down the blower keeps running. I can stop it by turning power off and back on. This stops the blower, but after about a 90 second delay the blower will start up again. The furnace DOES NOT start up only the blower. The new BCC is made by ICM Controls.

I'm a home improvement contractor but don't do a lot of HVAC work.

Any ideas anyone?



Last edited by KCDrew; 12-09-2009 at 01:47 PM.
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Old 12-09-2009, 05:39 PM   #2
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Sounds like your aftermarket board is not the right one. Lennox part number is a 48K98,believe it's made by heatcraft.
While you're there pull the blower assembly out and check the ring rivets on the heat exchanger.


Last edited by Marty S.; 12-09-2009 at 05:41 PM. Reason: added info
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