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Old 05-27-2013, 06:17 PM   #1
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Possible Hydro Hot problem

Here's the scenario: Hydro Hot furnace/hot water. 3 zones in coach. Zone 1: both Hydro Hot diesel and roof heat pump, Zone 2: Roof heat pump, Zone 3 : both Hydro Hot diesel and roof heat pump.

When I set the heat from the Hydro Hot, Zone 3 is toasty warm, while zone 1 just blows cold air. I cannot get heat in the front of the coach unless I use the roof heat pump, which supplies a good amount of heat.

The Hydro Hot seems to supply enough hot water when being used. I generally have been using the electric anode of the Hydro Hot and an auxiliary hot water heater for my hot water needs. This tends to conserve diesel fuel.

Does anyone have any ideas what might be going on with the Hydro Hot that does not allow the Zone 1 to supply heat?
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Old 05-27-2013, 06:34 PM   #2
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Is there air coming from the zone 1 outlets?
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Old 05-27-2013, 07:01 PM   #3
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Yes there is, cold air.

Zone 3 is nice and warm, Zone 1 is cold air only.
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Old 05-28-2013, 09:09 AM   #4
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On your HH panel (in basement) is your LED for the zone 1 pump on?
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Old 05-28-2013, 09:21 AM   #5
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There is a check valve near the pump. They occasionally stick. The easiest way to free it is to give it a light tap with a hammer or the back of a screwdriver.

Works best if the pump is running when you tap it.
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Old 05-28-2013, 09:45 AM   #6
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When I was running the Hydro Hot system, the pump light was on. Right now I'm running roof heat pumps because it's rainy and cold.

I will have to find and investigate the check valves next. It does appear there is power OK, so I suspect the problem is more plumbing than electrical at this point. Once it clears up a little outside I can investigate a little more.
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Old 05-28-2013, 03:59 PM   #7
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In a phone conversation with the dealer, the technician believes it is the Zone 1 pump. I am working on convincing them to pay for the repairs since this is the first time we used the Zone 1 Hydro Hot since we bought this MH at the end of March. We have been living in it for less than a month and just yesterday picked up our grandsons that are sleeping in the front.
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Old 05-28-2013, 05:22 PM   #8
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Most likely, you have a stuck valve as StevenH has given the best solution and also what AquaHot/Hydrohot factory techs will tell you to do first in this situation. I have unstuck a few of them. Best is with a heavy screwdriver using the plastic handle end to do the tapping.
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Old 05-28-2013, 07:41 PM   #9
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I have to find the valve first. Anyone have any ideas where to look?
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Old 05-29-2013, 05:21 AM   #10
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It is inside the hydro hot "box". Get your model number off the unit and download the manuals.

Go to the aquahot site Aqua-Hot - Manuals download the manuals for your model.

Look at the outlet port the check valve should be there.

It should look about like this Mueller Global 3/4 in. Brass MPT Solder Swing Check Valve-101-504HC at The Home Depot
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Old 05-29-2013, 05:56 AM   #11
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I had one zone that wasn't working, I was able to take the cover off and squeeze the black supply hose and free it up. It had been sitting for awhile. Also I found out that the control board indicator lights will tell you what's called for or supposed to be working, but don't necessarily indicate that a pump may not be working. In my case the light was lit for the pump, but it was not working. Once freed up, all is well. Good Luck!!
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Old 05-29-2013, 06:34 AM   #12
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I'll try removing the cover on the Hydro Hot and tap the valves. Hope this works! I'll repost when I have any further info.

It has been really stormy here all night with heavy rain and thunder, although it is considerable warmer. By this afternoon it is supposed to dry out a little. This will give me the opportunity to check the valves. Thank for the info.

I'm still learning the systems on this coach, whew, there is a lot to learn!
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Old 05-29-2013, 06:20 PM   #13
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The cover you need to remove is only 4 screws. It should be the end where the drain scupper is in the pan just forward of the cover. Do this first, should save you a lot of headaches. On the other end are exposed valves on the back of the unit, this is not where you want to be. You need to remove the cover plate to expose the Wasbsto burner unit and the valves should be below it and close to the "boiler" or central area of the AquaHot. Just a few slight taps should get you working.
However, I have seen some older models of CC's that had their own variation of the system, with some of the valves/pumps located remotely from the main unit. Why I don't know, but some require removing the bed and floor below or be on a pit to access the problem above the tranny . Yours should be in the unit itself on a 2006.
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Old 05-29-2013, 07:15 PM   #14
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I had the same problem with Zone 1 a few months back. Blowing cold air up front and warm air in the bedroom. It turned out that Pump 1 was not working to circulate the boiler antifreeze through the Zone 1 heat exchangers. The reason was a badly crimped barrel connector on one of the wires leading to Pump 1. Replaced the connector and everything worked!
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