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Old 12-07-2022, 08:49 PM   #1
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Brand: Thor Motor Coach
Model: Aria - 3901
State: Michigan
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THOR #14654
Atwood Water Heater Switch

We have 2017 Thor Aria. Does anyone know if there’s a remote switch for the electric water heater, or is the Firefly system the only switch? And if there is a switch where is it located. Propane working well, just no hot water on electric.
Thank you for my insights.

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Old 12-08-2022, 02:42 AM   #2
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Did this just start or has it never worked on the electric side? Dual fueled water heaters are fairly new in the big scope of RV history. Factory told me dealer personnel turn heaters on with no water in the (when new) and burn up the heater element, not knowing it. They should install a float bypass that will prevent electric power when they are empty.
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Old 12-08-2022, 03:44 AM   #3
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When mine did that, the control board was the problem. I called Attwood and they were very helpful. There were some bad boards sourced from China. They had me send a picture of the board and sent me a new one. As far as I know, there is not another switch. The elements can go bad, one did on my last MH. On the older units there was also a separate thermostat for gas and electric located on the back of the unit, I'm not sure about these new ones.
Mike
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Old 12-08-2022, 02:01 PM   #4
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Thanks for your inputs. I got conflicting info from Thor customer service. I’ll follow up Dometic.
WH worked before we had to winterize the coach at the service center for slide issues.
Thanks again
Mike
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Old 12-08-2022, 05:14 PM   #5
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THOR #1469
No remote switch on my Atwood 10 gallon. Jayco replaced the whole water heater when the electric side of mine did not work during the shakedown.
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Old 12-08-2022, 05:16 PM   #6
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Quote:
Originally Posted by Mk1putt View Post
Thanks for your inputs. I got conflicting info from Thor customer service. I’ll follow up Dometic.
WH worked before we had to winterize the coach at the service center for slide issues.
Thanks again
Mike
My bet is someone turned it on while it was bypassed and and empty which fried the heating element.
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Old 12-08-2022, 05:58 PM   #7
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Thank you EA37TS - appreciate the info
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Old 12-08-2022, 08:07 PM   #8
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X2 on the control board. The cheap Chinese ones they use are notorious for failure. If that proves to be the issue for you I’d suggest you replace it with one from Dinosaur.
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Old 12-08-2022, 08:51 PM   #9
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Thanks Pete’sMH - I’ve heard/read that Dino are higher quality
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