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