While you wait for answers, we may have found some information which could help you.
Success
Message
Intermittent hot water problem?
radiators not getting hot?
how can i fix my heating?
How can i resolve intermittent hot water?
no hot water for bath?
hot water not working?
pressure to high and leak on the outside pipe?
fan is idle when it is supposed to be slow running?
diy plumbing?
How to find pressure switch?
Changing expanson Vessel?
If water pressure needle ( blue ) is hiher than 1.5?