Rough ignition.

Old 01-27-09, 09:20 PM
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Rough ignition.

I have an old Tappan furnace its from the 70's lately it has started to have an ignition problem. There is the pilot light then the click from the gas valve. The first two burners ignite just fine but the 3rd one can take up to 7 seconds then it ignites when a very loud bang what can cause this and is this dangerous also there is alot of what seems like ash on the exhaust part of the furnace.
Old 01-27-09, 09:34 PM
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Usually taking the burners out and cleaning them with a wire brush will correct the king of delayed ignition problem you describe.

If I were doing the job I'd have a hand on the gas valve control to shut off the gas and observe very carefully exactly the point at which the flame fails to be carried over from burner to burner. But that's probably inviting a face full of flame for someone not experienced at making that kind of observation.

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