FootballFan
Well-Known Member
Do you have an icemaker which could account for intermittent pumping?Beyond that, the most common causes would be air in the water line or a leak.
Some years ago I spent weeks trying to find a water leak causing cycling. I isolated it to the hot water circuit but could not find it. Finally, I found that it was the pressure relief valve on the water heater, which was plumbed overboard. Replacing that valve regained my sanity.
Have chased down a couple over the years. The two that were the most difficult to find:
Pressure relief valve on Hot Water heater. It was plumbed overboard, so no water anywhere in the boat. Finally reached the point of having trouble maintaining hot water. Had the valve replaced, solved the pump cycling problem.
The second difficult one was a wash down faucet on the bow that was inside a locker where lines were stored. Pushing the lines in were sometimes hitting the handle. I had checked it, was tight. But a day or two later, pump was cycling ( after the boat had moved and lines were taken in and out). We moved the lines after that.
I have never had a problem with a line rupturing. It has always been at a connection point or the manifold.