Originally Posted by Zoe-Woody
Forester SW6DE water heater not shutting off on electric (not tried gas but would think the same). I have done some research and I belive the thermostats need to be replaced. The issue is the water heater just keeps heating the water until the 30 amp breaker on the main camp ground poll blows. I know the the little on/off switch needs to be replaced as that won't turn off. Any one have any ideas or does it sound like the thermostats ? Also, does anyone know where to purchase the thermostats ? I believe the switch is any single pole 120 volt 20 amp switch.
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As others have explained, the thermostat/hi-limit is built into one unit, that attaches to the front of the tank. You have two of these devices, one for the electric element side and one for the propane/dsi side.
If for example, the electric element hi-limit ECO/thermostat was loose and not making good contact with the tank (or the thermostat and eco went bad together), then the element stays on, drawing 12 amps continuously. Eventually as the temp rises too much, then you pressure/relief valve on the face of the water heater will start spewing water too.
None of this would just cause a power pedestal breaker to trip, without other factors present. I'm actually wondering if you are correctly using the water heater (and if the electric element has not been burned out), as the Suburban water heater is ill-explained by many service techs in PDI's and several people are using the gas/propane switch incorrectly thinking it controls the electric part too..
I think this FAQ link below may help somewhat, as it explains a lot on the Suburban water heater, including amp draws. I would recommend reading it, to verify some things, then we can go from there.
If nothing else, you should perhaps flip off the 15 amp circuit breaker inside your RV that controls the water heaters electric heating element. Then just use the propane side to see how it goes, also explained in the link below.
Suburban's electric switch and much more
Also this is a great link that all RV'ers need to know, in how to manage 30 amp electrical loads.....which you may be overloading, and why the pedestal breaker is tripping. One more thing, especially in hot weather and air conditioning use, is that many parks have weak 30 amp breakers, and summer usage electrical demands on a park also up the amps, and lower the voltage that the park provides......another reason your parks pedestal breaker may be tripping.
Basic RV Electricity - RV Information (RV Maintenance)