When the water pump turns on by itself.
We started out this week long trip at a state park with just an electric hook-up. Not long after settling in, I hear the water pump kick in, even though no one is using water. My spidey senses alert...
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Finding no leaks when my water pump was running about 2 seconds every half hour I changed the pressure switch, 38 bucks on Amazon. I am almost certain that was the problem since the pump is over 18 years old. The motor bearings where still good and added some lubrication to the bearings. Man does it work great now.
