While you wait for answers, we may have found some information which could help you.
Click here for Low Hot Water Pressurehow can i fix my central heating. Glow-worm ultimate?
fitting thermostat?
Intermittent boilet fails to fire on heating?
boiler will not turn off (only manually)glow-worm micron 80ff?
radiators hot when water turned on?
Glow-worm micron 60ff boiler niosy ?