Strongly advise grabbing the Atwood service manual that HoneyBadger pointed you to. Keep a copy handy. Your water heater will start on about page 15. Three or four pages later the trouble shooting section starts. Try it, you will like it.
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Pete - Full Timing
2000 Country Coach Magna 40' Indulgence, CAT C10, #5892
2019 Ford Ranger XLT
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