I have been having problems with the above boiler on and off for about 6 months. initially the shower was just running hot and cold repeatedly every 5 mins, then I couldn't get any hot water at all. I got a Vokera engineer to take a look and they were unable to fix it, until on the fourth visit...
I've got hot water or central heating just now!
I am looking for a instruction manual for this boiler, and any recommendations for plumbers in the Glasgowe area.