Can you please advise me. I have f5 in red flashing on boiler. heating was fine earlier, then turned on hot water to run a bath, ok at first then water went cold. Tried resetting boiler but still the same, pressure is on 1.1 bar , can you help please ?

angie, September 2010

i have the same problem after the builders took one of the downstairs heating panel off and put it back on. The pressure bar is on 1.3 though... I tried restart it, hot water came back on, but the red light keep flashing and F5 reappeared....

elena, October 2011