Many thanks for your comments
Cylinder upstairs grundfos 15-50 pump The Glowworm in Kitchen downstairs small 3 bed house 7 Radiators in total. Typical when you start using the heating when weather changes
Hi all
As of this week I had an F5 overheat this was reset two days ago Now I'm getting really loud clunking when heating comes on Hot water is fine. Any ideas. The boiler is about 6 years old.
Many thanks
Brian