Atwood Water Heater

Moved to Tech Issues forum from DIY.

Follow the DC voltage......find where the 'resistance' is dropping the voltage

To switch---12VDC
To circuit board.....12VDC (Brown or Orange wire)
To T-stat then back to circuit board....12VDC (Brown wire)
To ECO then to Gas valve.....12VDC (Red wire)

Loose, dirty, corroded connections........high resistance....stops DC easily

NOTE:
DC Voltage to gas valve only happens for 6-8 seconds while spark electrode is firing.
Circuit board drops the DC to gas valve after that unless flame lights off and proves it lit

You have one of the newer electronic control panels? If so bad news is it has probably failed.

Manual states needs 10 volt minimum
Find manual at
http://bryantrv.com/docs2/docs/atwoodwaterheater.pdf

rx2tee wrote:
... Should it be 12 VDC to the valve?

Yes