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MrVan's avatar
MrVan
Explorer
Nov 03, 2014

Atwood 8535 IV fires three times wityh flame and then quits.

I've done a search on RV.net for this kind of problem and there are a few closed threads but I'd like to try one more time to get some help. RV has not been used for a few months. Tested the furnace a...
dougrainer's avatar
dougrainer
Nomad
Nov 04, 2014
The furnace will do what you have experienced if this happens.
1. The Spark Electrode GAP is not correct
2. The spark plug wire is damaged in anyway (nicks or cuts which degrades the millivolt return signal to the board showing flame)
3. The Spark Electrode has hairline cracks in the white porcelain insulator the metal spark plug wire is imbedded in (which also causes a disruption of the return millivolt flame voltage).
4. Then the Module board. Doug

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