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So - there are two thermostats. You can troubleshoot by switching the thermostats. They are contact thermostats - make contact with the outside of the water heater - not inside like residential water heaters.
What worked for me was simply swapping the wiring connections from one to the other thermostat. They're right next to each other.
If the propane thermostat is good - you should get ignition when you use the switch in the camper. If you can get the propane to work on both thermostats, they're both probably good. It's the fastest way to check without a meter or waiting for the electric mode to heat up.
I just had the electric switch go bad. It was sticky and when in the on position, no electric hot water. Removed the switch, tested and it's bad. Off to buy a new one.
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2012 FunFinder X 210UDS
4-68 watt flexible panels; 1-215 glass panel/4 Battle Born LiFePO4 Deep Cycle Batteries
2014 Ford F350 6.7 Liter PowerStroke V-8 Diesel longbed, SRW
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