The water pump saga is not over!
The pump is not shutting off again and I am losing water through the relief valve at 3 bar pressure. To make sure that I had adjusted the pressure switch to minimum I removed the adjusting screw! Two turns back should have done the trick but not in this case.
The supplier of the pump is now on a winter break until March. So I rang up Tony, the fount of all knowledge on all things technical in a narrowboat. He loves to talk about these little problems and had a solution: ditch the pump pressure switch and get an independant switch from a reputable chandler. It should cost about £20. He recommended a Square D switch.
So I went to Midland Chandlers at Braunston. It is about a 40 minute drive from home mooring. I told the man what I wanted and he said that they had these switches for about £50 and I would need a fitting kit and tee piece in addition. He could not locate one on the shelves, however, (they are enlarging and re-arranging their store) but he did have what he felt was the real solution to my problem.
He told me that Midland Chandlers have about 150 Shurflo pumps ready to be returned to the manufacturer because of defective pressure switches! Since switching manufacture to Mexico the quality of the pumps has dropped remarkably and there is a whole batch of pressure switches that just do not work. My pump supplier had said that his wholesaler was Midland Chandlers! Could it be that he had part of this batch? I was told that they could not help me with my pump and were sympathetic but legally I had to go through my supplier. On the shelf were genuine Shurflo pressure switches from the previous incarnation of pumps, made in USA, and fully compatible with the pump I had installed. Cost £28.
This seemed the logical solution to get me through the winter. I can return the pump to my supplier, still under warranty, in the Spring.
Watch out for further instalments.
2 hours ago