Old-Biscuit wrote:
What model of Atwood?
You talk about a pilot, automatic lighting, talk about a circuit board and WH being a new one :H
Circuit board, auto light so WH is probably a DSI (Direct Spark Ignition) that uses a spark electrode to ignite Main Flame.
As suggested by other posters.......check the thermal cut out (thermal fuse in a clear tube connected to brown wires on T-stat.
IT trips if temp inside outside compartment goes to 190*F or higher (usually due to a blowback from combustion chamber....dirty chamber/burner tube/obstructed gas flow) and cuts DC power.
Thermal cut out is a one shot safety device..if blown has to be replaced.
You can remove it and test function of WH.
Disconnect it from circuit board and t-stat....connect wire from circuit board to t-stat and then turn WH ON.
Should spark and main flame light off.
You can run it like that until you get a new thermal fuse.........but make sure main flame is strong/steady/and not coming back out of chamber.
Clean chamber/exhaust 'U' tube and burner tube main flame is erratic
Thanks, everyone for the suggestions, and thanks Old-Biscuit for the diagram. I removed the thermal cutout and it fired right up. I'll be sure to pick up a new one and a few extras at the next big city in a couple days. And we will use the hot water sparingly. We usually only need it for washing dishes, anyway.
My wife is pleased we don't have to. Is it the dealership during our vacation. Thanks again!
