While you wait for answers, we may have found some information which could help you.
Success
Message
no hot water?
Sime super 90 plus problems?
sime super 90 plus hot water issue?
Sime super 90 hot water problem?
Sime?
can i pressurise expansion vessel?
radiators come on when running hot water?
loss of heating and hot water?
How do I increase the system power to between 1 and 1.5?
sime 50 superior?
sime friendly?
plumbing?