Thanks again.
It's a combi boiler, and the problem is coming from the heating return as far as I have been told. I assume I need your combimate.
Really appreciate your help.
Keith.
Apologies, my first post and it's probably been covered many a time before. It's not my first visit though, and I'll give thanks for the info I've taken from this site previously: a god send for the amatuer like me.
Anyway, the heat exchanger in my boiler keeps getting clogged up (with...