Plumbing mystery overflow from loft

[Cubist]

Soooo, the plumber is suggesting that water pushed up through the expansion pipe is cascading over the ball float to then operate the valve to let more water into the tank thus causing the tank to overflow.

Logically that may seem to work but - have you ever tried to push one of those ball floats under water by hand? It takes a lot of pressure to do that and much more than I would expect from a cascade from a 15mm pipe.

Forgive this old cynic but I think your plumbers pulling your <insert preferred noun here>.

 

[a twig]

I don’t think the plumber is saying that @Cubist - from the message Kathy posted on March 2nd the plumber reckoned the height of the pipe was too low so not giving enough expansion “room”.

If he’s now moved the pipe upwards then the expansion has to travel further up before overflowing into the tank

Anyhoo - fingers crossed all your woes are solved @Kathy - doing that is a lot cheaper than some of the other woe and doom I was peddling!