Atwood 10 gallon water heater

[rtmshiffts]

I need a little help. I filled my Atwood water heater with water for the first time this season and proceeded to light it on gas. It would not light right away. I finally got it to light with both the gas and electric on. I also had the ac on and when that kicked in it blew the breaker. Flipped the breaker back on and now I can't get it to light on gas. It will heat with the electric but nothing with gas. The lockout lamp does not come on either. I have never had any problem with it before. It is a 2008 Crossroads Cruiser 5th wheel
Thanks for any help

[WinnieView]

Is there 12 volts DC present at the control board?

[Old-Biscuit]

Your 2008 Atwood uses DC to control BOTH electric and propane heating cycles.

SO DC is not the issue cause both use the same common DC source.
AC breaker tripping is not issue/connected either


AC working means that the thermal fuse, the t-stat and the ECO circuits are functioning

Question is whether the 'gas' circuit is functioning or if issue is with spark electrode or gas valve solenoids



DC goes to ON/OFF switch.....then to circuit board via ORANGE wire
DC comes from circuit board to t-stat via BROWN wire thru 'thermal fuse' and back to circuit board
DC comes from circuit board to ECO and then to Gas Valve solenoids (RED wire) during the time DC is going to Spark Electrode


SO do you get a SPARK.......click, click, click???
Do you hear the gas valve solenoids 'click' when energized?
Does any gas flow and attempt lighting off?


DC is on gas valve solenoids for very short duration while spark electrode fires so RAW Fuel does not accumulate in combustion chamber


Got a voltmeter......use it to trace the DC Voltage for the propane circuit

[MSHappyCampers]

Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Old Biscuit is the man with the plan!

Good luck, happy trails, and God bless!