Quote:
Originally Posted by barry12345
Twenty years may even be a little longer than usual for an average lifespan of a fan control these days.
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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.