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Old 06-07-2015, 10:44 AM   #1
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Attwood Hot Water Possible Issue

I have searched the forum and find different variations of my problem ... but not the exact problem.

The issue is with the electrical switch light for the hot water heater. When I turn on the switch I get no light but the water heats up very very hot. Periodically (no rhyme or reason to hour many hours have past) I can look over at the light next to the switch and it will be on, I have never noticed this before.
Some forums say it all depends on how the manufacturer wired it ..... it would seem to me that if the manufacturer wired it to light up when it has power then it would light up as soon as I turn on the switch .... not several hours later after the water is already hot.

Any suggestions would help ... thanks.
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Old 06-07-2015, 05:02 PM   #2
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Typically the switch to turn on/off the electric heating element is just a 12vdc switch with a light in it to indicate the switch is on. If that is what you are referring to, then the switch light is just going bad which is often the case.

The other switch to turn on the propane either has a light in it or an additional light to indicate that the flame did not light or when out when it should not have. This lights is called the DSI fault indicator.

Sorry for the long explanation, but every RV manufacture wires and sets these up differently.


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Old 06-07-2015, 07:21 PM   #3
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Can you please post the make model year and chassis type of your coach please. Your atwood model number would be great too.

Just to make sure we are on the same page... the water gets hot whether the light is on or not?

Its possible that there is some sort of temp sensor that tells you when your water is hot? My water heater has a light that turns on when I turn the switch on. Its also possible that this is the same setup as yours but that there is a loose/poor connection to your light.
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Old 06-08-2015, 08:03 AM   #4
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Atwood Water Heater Gas / Electric Switch RV Camper

Above is a picture of the switch ...

Its a 2006 Gulfstream 3105 Toy Hauler 5th Wheel

The water will get hot, the light (whether working or not) doesn't seem to have an effect on the hot water heater.

Understand why the light on the gas side comes on, its the light for the electrical that comes on intermittently that I don't understand.

As mentioned above, it could just be the 12VDC light that is going bad

Thanks for the inputs, greatly appreciated
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Old 06-08-2015, 08:21 AM   #5
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According to this drawing, that light is the DSI Fault light which means that it should not be laminated during Electric operation.

With that, I'd guess at a lose or poor connection on the water heater circuit board. Atwood's are also known to have a ground problem where the green wire is screwed to the metal when looking at the outside access area.Click image for larger version

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