Aqua Hot Problems

I have run into a similar situation on two separate occasions. The first time was in our first coach (2005 Fleetwood Providence)that only had a 12 gallon water heater. Water temps were never more than luke warm. Found the shower valves in the plumbing bay were turned on even though the shower head valve was shut off. This, I was told, activates the mixing valve thus making the water warm only. The second time with our current coach with Aqua Hot I found that the water valves in the rear shower were left on and the shower head shut off was activated. Released the shut off valve and turned off the water and voila.....hot water again.

Dan

What model is your Aqua Hot? Download the parts manual and you can see where the mixing valve is located. Follow JohnnyT's instructions then adjust for desired output temperature.

The check valves are in the heating zones and are sometimes used on the "motor aid" loop (if equiped). No check valve on the hot water.

Steve

There are 2 (as I recall) check valves that can stick, knocking them with the plastic handle of a screwdriver (quite hard) can jar them loose. I hope this helps, Bill

Does anyone know where the mixing valve is located. The service tech changed out the theromstat and that didn't help. Seems like I remember him mentioning the mixing valve and said it was around back of the unit and hard to get to. Thank all of you for your help.

bodyman7 wrote:
I have a 2013 Winnebego Tour. When the electric hot water switch is on you came put your hand under the hot water facet and the water is lukewarn but will not burn you, adding the Aqua hot helps a little but while taking a shower the water gets lukewarm but does not get hot even with the Aqua hot on.

My assessment is the mixing valve is the culprit... Take note of where it is so you can return it to its original position then cycle it by moving from one extreme to the other. My experience that this will often cure the symptoms you expressed. You can also bang on it with the handle of a large screwdriver...

I and others I know have experienced the Luke warm phenomenon and my suggestion have been the cure.

You stated you had a "certified Aqua Hot tech" work on your unit. Can you explain that????? Aqua Hot units are NOT that hard to diagnosis. They can be a pickle to replace certain parts. But, ANYONE that shows up at FMCA events and claims to be Certified for anything should be able to diagnosis and either tell you what needs to be done or FIX it at that time. What does it take to be a "certified Aqua Hot tech"???? I work on them and have for over 15 years, but I am NOT certified by Aqua hot. On NEW units, you should never have to mess with the mixing valve. IF you have to mess with a mixing valve it needs replaced especially under warranty. They are preset and require NO adjustment as long as all other parameters of the Aqua Hot are to spec. Some things that will cause your problem on new units
1. Incorrect on incorrect mix of the antifreeze solution. This is critical for heat transfer in the boiler. Using straight non mixed Antifreeze will cause your type problem. It MUST be a 50/50 mixture.
2. On 120, you will NOT have continuous Hot Water if you have the single element. Aqua Hot with Dual 120 elements will provide continuous hot water. You MUST use the Diesel burner to provide continuous Hot Water on single element units, but that is not your problem as you stated you tried the Diesel Burner also
3. You have changed the tstat, but there are limit switches also and the fact that this so called tech could not diagnosis and fix your problem after he changed the tstat makes me wonder if he DID change the tstat or he installed the wrong tstat. Doug

bodyman7, your Aqua-Hot should be SO hot you can't put your hand under it. Ours is super hot, especially, when it's heated by the engine on a long driving day. We have the duel stage electric elements and we have some darn hot water let me tell you!

You obviously have a new coach under warranty so I'm sure they will find what the problem is with the Aqua-Hot and it will be working perfectly soon.

Good luck,
MM.

Do you know if the AH tank is hot? There is a mixing valve that my need working on. Out of adjustment or stuck open and getting to much cold water. Check you tank temperature.

If you do not have a manual for your model you can down load one here:

AquaHot Manuals

There is a mixing/tempering valve that can be adjusted to change the temperature of the water going to the faucets.

Also make sure that your wet bay faucets are turned off and not just the valve on the hose if your coach is set up that way.

Steve

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