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Old 05-19-2014, 11:35 PM   #15
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Naples, FL , Hood River, OR
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Originally Posted by Hibby View Post
AW Warn, those are both great thoughts, and I will try them tomorrow night. The trailer is relatively new, and I have no problem with cold water pressure, so I don't think it's scale, but I'll check to be sure. I will definitely try the water bypass valve in different positions.

Bigventure & Lewster, Here's a picture of my valve setup:

Attachment 212327

The yellow valve is the bypass, and I believe the larger metal cylinder at the top of the water heater is a mixer valve....

If you look at your water heater, you will see that it is an Atwood XT model. These units purposely over heat the water in the tank to about 160ºF and then mix or 'temper' it down by adding cold water to the extra hot water exiting the tank by the silver valve assembly that you have in your photo. You can see the cold water line entering the valve from the bottom. The now tempered hot water exits out the side.

I have seen many of these units with the same problem that you have. If you read your owner manual, you will see some fine print that details how you should flush that valve with vinegar on a regular basis to avoid calcification within the thermostat control section of the tempering valve. Problem is....I HAVE NEVER MET AN RV OWNER WHO DOES THIS.

The result have to change the valve in order to get hot water again. You SHOULD NOT by-pass this valve by removing it, as 160ºF water WILL BURN YOU.

PM me if you need any other detailed information.

PS: With all due respect Bigventure, If you are not familiar with the operation and components of an Atwood XT model water heater, please do NOT provide misinformation that is based either on a guess or your experience with a standard water heater. His bypass is probably in the operational position and NOT backwards. The yellow valve at the bottom of the photo is a shut-off valve for the cold water supply to the water heater, NOT A BYPASS.

Lew Farber...RVIA Certified Master Tech...ABYC Certified Master Marine Electrician
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Old 05-22-2014, 10:27 AM   #16
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2012 30' Flying Cloud
Grand Rabbits , Michigan
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Lewster, THANK YOU! I have not attempted to replace it yet but plan to do so as my next attempt (tonight if possible!).

With your explanation, I am relatively sure that this is the issue...

Thanks to all of you for your suggestions, and I will post an update as soon as I know for sure that the problem is resolved.

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Old 05-25-2014, 05:37 PM   #17
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Alright, I think I'm actually up and running again. Thought I had it fixed on the first try but didn't have the water temp set correctly.

I was able to remove a small back plastic insert (which was in a larger black plastic cap) with a knife blade. The insert covered a screw that held the larger black plastic cap in place. Once the screw and larger cap were removed, I was able to use a crescent wrench to turn the brass nut that determines temperature. Quite frankly, I just kept turning it in and out until I had warm water flowing again at the right temp. I'm not sure if the nut just needed adjustment or if adjusting broke some blockage loose, but it's working again.

I'm going to order a spare mixer valve just in case, since Camping World said it takes two weeks to get that part in... I'd rather spend the money and never have to use it than to take cold showers (although my wife has suggested that I should try it).

Thanks to all for your help!

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