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Have a rheem criterion II. Model

Have a rheem criterion II. Model #RGPH-06EAUER....
Frquently, only the first of three burners / flames ignites and the cycle stops. Furnace cycles two or more times before all three ignite and furnace stays running. Tapping the gas line to the manifold encourages ignition of all three flames... I have cleaned all ports on the manifold and the filter remains clean....How do I remedy this?

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The way it lights is that the gas is spread from one burner to the next by either a flame tray or small holes drilled in the burner tubes. If the flame does not get all the way across the burner tubes within a few seconds, the unit goes out on failure. Clean and inspect each burner tube, not just the orifice. Clean any tray that connects the burners. You can use a small wire brush or tooth brush but be careful near the glow igniter as it is very fragile.

Posted on Dec 12, 2009

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