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When was the last time you checked the LP pressure at the tank regulator? That should be done at least once a year and is the most common problem when LP appliances won't light and stay on. Do that and then get back to me and we can do some testing if needed. All follow ups are included in our fee.
I am adding a copy of the installation manual in case you don't have it. Be sure that you got the hot and cold water connected correctly and that if you have a bypass for winterizing that it is set in the correct position. If you have no or restricted water flow the water heater won't ignite. http://www.atwoodmobile.com/manuals/waterheaters/IOM-ODWH-90222-07-09-13.pdf
Just checking back in to see if you were able to resolve this issue or not? If you still need some additional input from me please let me know. Thanks!
I don't think on that model it can be. You may need to call Atwood Customer Service and get some help from them. This may have a defective part if everything else checks out good. I can tell you these are very fussy about gas pressure and if you didn't check that before you should.
I set all my customer's regulators at 12 WCI which make it about 11 WCI with about 35K btu used at a single time.