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Old 07-07-2021, 08:35 PM   #1
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Talking 2016 Keystone Fuzion 345 Water Heater

Recently bought this toy hauler. Never owned a trailer with water heater and other systems. Water heater is a Suburban SW12DE.

In the main switch panel with slide controls, tank level lights , etc.. There is a water heater rocker switch , a DSI light, a Water pump switch. The water pump switch works, lites up red when the pump is running.

The water heater switch did not light up in the "on" position. A new rocker switch fixed that. Now the DSI light is "on" ... that was not happening before. The propane is turned off at the moment.

My question is: Does this water heater switch control the electric side of the water heater too or just propane?

When the circuit breaker is "on" the water heater electric side is working. The rocker switch in the panel does not affect the electric side of the WH. Red light on or off the WH is working when Toy hauler is plugged into shore power. I watch the amp draw on my WatchDog 50amp protector app on my phone. One guy tells me the switch should shut off the WH completely , another guy says it only shuts off the propane. There is a second "on - off" switch outside on the water heater that kills the electric side. I read about this 2nd switch in the manual that I have for the WH.


The owners manual with the Toy hauler is not clear. It just says there are switches in the monitor panel for WH control.
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Old 07-07-2021, 09:22 PM   #2
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That switch behind the outside panel has to be in the on position to use the 115 side of the wh. Your unit may be wired with an inside on/off switch for the 115 side of the wh but the outside switch has to be on for it to work with the inside switch.
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Old 07-08-2021, 03:16 PM   #3
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That switch behind the outside panel has to be in the on position to use the 115 side of the wh. Your unit may be wired with an inside on/off switch for the 115 side of the wh but the outside switch has to be on for it to work with the inside switch.

Thanks... I have found the outside power switch behind the cover panel. It appears this WH is wired for full time function if the Toy Hauler is on Shore power. The switch inside on the monitor panel controls the propane side only.
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Old 07-08-2021, 04:13 PM   #4
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Do not consider that it is set up for full time function just because there is no inside switch. That switch needs to be used to turn it on and off. Some, myself included, have added interior switches with an indicator light to show when power is going to the water heater. Not using that outside switch will lead to the possibility of the ac side being on when there is no water in the heater. That will cost you a new element in just a few minutes.
A safe method is to turn the ac switch off before you unhook from the pedestal and back on after you get full flow out of a hot water tap. Do not bleed the air from the wh with the pressure and temp relief valve. Doing that will eliminate the air needed to absorb the expansion of the water when it is heated.
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Old 07-11-2021, 07:46 AM   #5
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Do not consider that it is set up for full time function just because there is no inside switch. That switch needs to be used to turn it on and off. Some, myself included, have added interior switches with an indicator light to show when power is going to the water heater. Not using that outside switch will lead to the possibility of the ac side being on when there is no water in the heater. That will cost you a new element in just a few minutes.
A safe method is to turn the ac switch off before you unhook from the pedestal and back on after you get full flow out of a hot water tap. Do not bleed the air from the wh with the pressure and temp relief valve. Doing that will eliminate the air needed to absorb the expansion of the water when it is heated.

Thanks for the suggestions. What I have done is turned the water heater circuit breaker off in the main service panel in the garage of this toy hauler. We are still sitting in a park in Sun City AZ on west side of Peoria AZ. Having warm water to use is not a problem here right now with daily high tems of 108 to 111*F ..

Our plans to get up towards Show Low AZ went bad with the early forest fires , closed roads, more fires, more closed areas. So : We are getting ready to head to Wisconsin and Illinois to visit family and friends.
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