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Old 12-26-2014, 07:07 PM   #1
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No Hot Water

We're camping out in the RV while the hardwood floors in our home are being refinished. We have a Hydro-Hot HHE-200-09 and while it produces heat for the furnace, it quit producing domestic hot water for the sinks and shower. It worked like a champ for a number of days and then Nada hot water. There are no red lights on the Hydro-Hot Electronic Controller. Any ideas?
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Old 12-26-2014, 08:10 PM   #2
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Are you plugged into shore power or running off batteries?
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Old 12-26-2014, 08:15 PM   #3
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Are you running both diesel and electric or just electric?
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Old 12-26-2014, 08:18 PM   #4
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Ask Roger Burke at the Aqua Hot forum. He's the most knowledgeable guy you'l find on the Aqua Hot.
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Old 12-26-2014, 08:27 PM   #5
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Shore power
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Old 12-26-2014, 08:28 PM   #6
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Just diesel
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Old 12-26-2014, 08:32 PM   #7
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Quote:
Originally Posted by Dennis4809 View Post
Ask Roger Burke at the Aqua Hot forum. He's the most knowledgeable guy you'l find on the Aqua Hot.
I've just posted the issue to his forum and am awaiting his answer. In the meantime, I followed the troubleshooting procedures in the HHE-200-09E service manual and found that the low temperature cut-off indicator light does not go out when there is hot water demand inside the coach. I then disconnected a lead to the thermostat and I heard a sound inside the Hydro-hot cabinet which I presume was the stir pump. The indicator light went out which suggests that the low temperature cut-off thermostat has failed.
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Old 12-27-2014, 12:22 AM   #8
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Well, I don't know much about Hydro-Hot units, but when a problem like that happens to an Aqua-Hot it is usually the mixing valve in the back of the unit. The water coming out of the back is really too hot to send down the line, so the mixing valve mixes some cold water into the hot water to bring it down to about 140 to 120 degrees. This valve seems to always get stuck in a way that sends cold water down the line.

I think if you had a problem with a cutoff switch it would be affecting your heating capability as well as your water supply. But, you say the heating part is working well.

As noted above, Roger is your very best source. But, i would not be surprised to find out that you have a problem with your mixing valve. Those who write about this problem seem to resolve it by tapping on the valve with a small hammer. In a worst case situation, it has to be replaced.
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