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Can anyone help when I turn on the cold water in the kitchen or bathroom it will run cold for a few seconds then start to come out hot then after about 20 seconds it will start to run cold for a bit then hot again and just keep doing it. My van is a Bailey Ranger 450/2 from 2000 and I have a truma ultrastore water heater, my guess is that there should be a non return valve somewhere that has packed up, any advice would be a big help.