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