I would have done what you did. I make sure the stove burners run for minutes to be sure propane is thru out the pipes after a change. Just to prevent the HWH, furnace or refer start up problems. In your case, I would go out to the hot water heater, open the cover and look and listen after turning on the switch.
If it making clicking sounds, that is the ignitor. It will click a few times, if it cannot start it stops trying. If it fails to start it normally is due to no propane. Caused by #1 no propane, #2 ignitor plugged or broken. I think you know the sound of it heating water, it sounds like a jet engine. And the light on the switch comes on. Others may come up with other ideas. I have not had problems beyond what I mentioned on newer RVs.
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2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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