Quote:
Originally Posted by Xlimodriver
Before spending money on a new fan/limit control I would check the condition of the heat exchanger. After 20 years those old Lennox models are riddled with rust.
Just get a flashlight and mirror and check the top of the heat exchanger through the burner ports in front.
Back when I was working as a sub-contractor for the gas utility in Toronto I would have to disconnect and red tag at least 5-6 every month.
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I will inspect it again asap, four years since last checked.
I am looking at replacement this year, increasing heating capacity to 125,000 btu.
The old Lennox unit never has been adequate under -10° F.
Note:
Please don't suggests sealing / insulating the house better, the walls are R-30, attic is R-60, floor is R-19, foundation crawl space walls R-13, windows are twenty year old thermal double pane.
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