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Old 03-15-2019, 06:19 AM   #1
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Hot Water

Recently I will turn on the water, a mix of hot and cold to get temp right. Then the water will pulse between hot and cold. First experienced it in the shower, then the bath sink, and then the kitchen. Most noticeable in the bathroom fixtures. Have an atwood gas/electric water heater. Using it in the electric mode. The water is plenty hot when it comes out. Just won't stay at temp selected. Keep pulsing from hot to cold, extreme change. Any thoughts???

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Old 03-15-2019, 06:36 AM   #2
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...debris in the appliance mix valves could be the issue but more likely, most RV "hot" water heaters have a one-way check-valve that keeps hot water from backing/expanding into the cold water pipe....this valve often has plastic parts inside and is prone to failure---symptoms vary from fluctuations in temps to total loss of hot water.….depending on heater location and length of time value has been in place, replacement can be challenging....

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Old 03-15-2019, 07:59 AM   #3
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Before doing too much troubleshooting, make sure external shower controls are turned fully off.
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Old 03-15-2019, 08:06 AM   #4
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Originally Posted by Elwood58 View Post
Before doing too much troubleshooting, make sure external shower controls are turned fully off.
- Mike
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Old 03-15-2019, 04:22 PM   #5
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Originally Posted by Elwood58 View Post
Before doing too much troubleshooting, make sure external shower controls are turned fully off.
Also if you have a mixing valve on the shower head itself, make sure it is off too.
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Old 03-18-2019, 07:42 AM   #6
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Still need some help on the hot water issue. Left the rally and returned to the resort in Foley Alabama and hooked up as usual with electric and CITY water. Cut the shower water on and hot and cold work fine. Works fine in the bath sink. We both took showers and worked fine. So, this only happened when using the pump. I had just replaced the pump before we left for the rally. Same pump, and there’s not much room for a mistake hooking it up. Water supply in and out. Two wires, and all hooked up just as the previous pump. Somebody help, I have no idea how the pump could cause a problem with the hot and cold water mix.

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