Thanks
I'll give that a go.
It is a 3 port motorised valve that is fitted, but I've never been able to have CH on w/o HW on. Is that likely to be a fault or the way my system is set up?
Hi Wonder if anyone can help. my Grundfos selectric 15/50 pump has started to make a strange "crackling" type noise. The CH and HW seem to be working OK it's just this noise has started. I don't know how old the pump is so maybe it's telling me it needs replacing -I've taken the front bit ...
