Did you winterize your motorhome, or did you have it done? It sounds like your by-pass valves might be in the wrong position and that's usually the reason you get warm water instead of hot water. Also, did you wait long enough for the heater to do its job?
For propane not working....
When you use the starter button for propane, do you hear it try to start with the clicker unit to ignite the flame? You need to be outside to hear it properly. The gas unit wil usually try 3 tines then go into lockout. If after a few tries, maybe there is blockage in the tube going to the flame burner....use compressed air to make sure it's clear. Or.....
If you're starting the heater with gas for the first time this season, make sure the propane tank is turned on. Then start all burners on the stove, and run for 2-3 minutes each. This helps the propane flow down all the tubes to the water heater. Is your propane alarm sensor working? If it's not, the gas will not flow.
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Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain
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