Hi all you plumer type folk
Here's the issue...
Since we've had the boat (2 & 1/2 years), the water pump has come on a few times each day for a few seconds without any taps or anything being turned on. I questioned this when we first moved on board and you kind lads said it wasn't anything to really worry about as it was just regaining lost pressure. Everything was fine till a couple of days ago.
I noticed it seemed to be running for longer and longer periods of time, I mentioned this to Dave who assumed I was exaggerating till a couple of days ago when he noticed it himself, the following day it started running much more frequently and for longer. To the point of approx 4 times per hour for up to a little over 1 minute each time. He looked into the cabin bilge inspection hatch and sure enough there was a fair amount of water there and the carpet was wet in one corner of the bedroom.
It seems that the pressure relief valve on the calorifier is tripped on permanently and he's checked the value which has a pressure gauge and when the pump is switched on the pressure raises above the 3 bar limit which trips the relief valve open. The water pump is now operating permanently unless switched off at the power source, but when turned back on the water pump doesn't come on till we turn on one of the taps then it just keeps running until switched off at the power source. Dave's assuming now that it's the water pump that's at fault, it's not switching off, driving the water pressure up above the 3 bar limit. It's a SHURFLO pump 3901-0213 he can't find any manuals either in the "boat book of manuals" that came with the boat nor online. The pump is rated at 2 bar but seems to be pushing the water pressure above 3 bar tripping the relieve valve because of it continually running. He can't find any obvious means of adjusting the water pump output pressure to keep it below the 3 bar relieve bar pressure and he's heard that this can be a common problem due to a micro switch failure. Does this sound right to you guys? Should we be looking at a replacement or a service kit?
The leak into the bilge has been traced back to a leak on the out put side of the relief valve which has been repaired.
Help please - the dishes are piling up and the loo needs to be flushed