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