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Old 08-14-2017, 09:56 AM   #1
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hot water heater-no hot water propane and electric

Wife and I are on a week long trail run before going full time in November and had a problem this morning. No hot water. We have had this problem before. First time the board was replaced. It worked for a bit then went out again then thermostat was replaced. Now here we are out again. It doesn't work on both electric and gas. The board makes a high pitched noise when electric is on which I read is normal. And the board lights up and igniter fires when turning on propane at least it makes the clicking noise. That's exactly what it did when the thermostat went out the last time. I think it's the thermostat again. Any other thoughts? Or a better way to diagnose the issue?

Thanks.
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Old 08-14-2017, 10:07 AM   #2
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The thermostat and other safety devices are normally closed and you can ohm the switch and check for continuity.

For troubleshooting you could short across (just momentarily) to make sure the gas valve comes on.
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Old 08-14-2017, 10:14 AM   #3
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The first repair only involved replacing the board and not the thermostat? Since only the board was replaced and used with the old t-stat and the new board only worked for a bit I don't think the t-stat would have caused a board failure. It's basically just an on/off switch. I think a line level electrical problem caused the board to fail

As for the high pitched noise coming from the board I've never heard that from any of my trailers.
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Old 08-14-2017, 03:01 PM   #4
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I had the same problem with my Atwood heater - 10 gallon unit that operates on gas or electric. I ended up replacing the water heater ECO thermostat assembly - part no 91447 and the water heater thermal cut off switch - part no 93866. I did this as a first step and it fixed my situation. Not sure which part fixed the problem but it was inexpensive and easy to do both at the same time. Yours may be different but if you search these items it will give you an idea what you are looking at. Good luck.
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Old 08-14-2017, 05:58 PM   #5
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I solved the problem, I took the board to a RV dealership to get them to test it per Thors instructions, and they didn't actually have a test rig for it, but suggested to replace the thermocupler. The first suggestion was just run without the thermocupler, I tried that and it did not work, connected the original thermocupler back and tested it again and it worked, so I'm guessing it was just a loose connection somewhere. I have some extra thermocuplers in case that is the problem if it happens in the future.
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