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Old 01-14-2019, 10:46 PM   #1
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Hot Water When Switch Is Off

What would cause your water to be HOT, when it's 35 degrees outside, & your hot water switch is off?
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Old 01-14-2019, 11:03 PM   #2
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Were you just driving? Engine coolant is run through a line on the water tank, heating the water on our rig.
Happy Glamping
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Old 01-15-2019, 12:58 AM   #3
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Were you plugged in and had it switched to electric, which on some was done outside the rig in the access to the water heater.
By the way, if you had just pulled in someplace after running for a bit that system is known as motoraid. Winnebago likes to do this so you can't complain about not having hot water while going down the road.
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Old 01-15-2019, 03:50 AM   #4
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Moxxi-

Your owner's manual mentions the "Motor Aid Water Heater" function on page 4-9. I note it says "If Equipped," so you would have to confirm that your coach has that option. With access to the rear of the water heater, you should be able to find the motor aid hoses there (or not).

This all assumes you found the water hot after driving, rather than just sitting still.
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Old 01-15-2019, 04:44 PM   #5
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The MH has not been driven in about a week.
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Old 01-15-2019, 04:56 PM   #6
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Quote:
Originally Posted by Moxxi View Post
The MH has not been driven in about a week.

First Off.....
Brand AND Model number will result in specific info on your water heater?


Are you plugged into Shore Power?
Suburban electric element OEM on/off switch is located in outside compartment lower left corner.
The switches fail due to exposure to elements.
They can fail in the ON or OFF positions.


Post more info about your water heater....OK
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Old 01-15-2019, 05:21 PM   #7
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Atwood gch10a-4e water heater
On/Off switch located on the inside.
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Old 01-15-2019, 05:58 PM   #8
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You should have two switches for that unit, one to turn the electric heater on and another to turn the gas function on, make sure they are both off and yes this model has a heat exchanger so the diesel engine will heat the water when the engine is running,
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Old 01-15-2019, 07:42 PM   #9
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Gasoline engine, not diesel. Both switches are OFF. That's why it's so puzzling.
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Old 01-15-2019, 08:27 PM   #10
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Both electric & propane on the Atwood use common DC for control.


With both switches OFF
Use voltmeter and check for 12V DC on WHITE Wire to top 4 pin connector on circuit board in outside compartment (that is the DC circuit for the electric function) *Orange is for Propane which you would know is ON.


12V DC on White Wire then electric on/off switch is shorted and NOT turning the DC off.
No 12V DC on White Wire then you need to check for 120V AC on element (located on backside of water heater tank under protective cover)
120V AC to element is triggered by a DC Relay (also where element is)
If that DC Relay is shorted...120V AC to element is energized. (t-stat would control the element being on/off)'


And YES you have a 'Heat Exchanger' on that model of water heater. The 'H' in model designates the heat exchanger (Hot engine coolant runs thru a tube that heats the water)
Have you been running the engine????




***You know where element and DC Relay are.
You had to look for it a long time once before then you found it.\
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Old 01-17-2019, 07:08 PM   #11
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Did you find the mysterious heat source that made your water HOT???
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