Water Heater Troubleshooting & Repair Guide


Well-known member
AUX switch?
Where is that?
My '21 dometic quit the other day, only it is lukewarm (98°) on BOTH Electric and LPG. The tank only gets to 112°.
First make sure the outside shower valves are turned off. Not just the handle with the push button, but the valves on the faucet. If on, it will allow the water to mix, creating a cooler "hot" water.


Prolifically Gabby Member
The label on the water heater tank should tell you its capacity. Larger rigs typically have a 12gallon unit.

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Pete J

I Have A 2017 Mallard I Cant get my water heater to Fire on LPG unless I do It manually Any Troubleshooting ideas Works fine on Electric