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Title: Rheem gas furnace false starts
Post by: Buzz on December 20, 2023, 11:43:43 PM

I have a rheem highboy gas furnace (1987 manufactured) that is having false start issues. Burner will come on for a second or two and then stop. A few seconds later it will repeat. It does this three or four tines before the burner stays on and after a short time blower kicks in. I'm worried that one time it will not start

Any thoughts on the possible cause and fix?

Thanks

Brian

Furnace model is RGAC-08KA

Title: Re: Rheem gas furnace false starts
Post by: Porcupinepuffer on December 21, 2023, 05:29:28 AM

Dirty flame sensor or crossover tubes at burner ends are not carrying gas across fast enough to reach flame sensor. I'd start with cleaning flame sensor with emery cloth.

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HVAC Forums => HVAC Help => Topic started by: Buzz on December 20, 2023, 11:43:43 PM