My recently installed heating system boiler (potterton promax ) keeps reducing water pressure. I have repressured twici in last three weeks. What is causing this?

jim, November 2008

I had BG out today to put in a new PCB. I also had the problem of having to keep increasing the pressure as it kept dropping. BG said all it was, was a small black rubber thing (not very technical - sorry!). He's replaced it also - but he says sometimes this part gets worn and is very easy and cheap to replace.

Z, November 2008

you have a leak somewhere

trainee corgi man ?, November 2008