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How can I fix my vokera combi boiler ( 14 years old)?

I have very little water flowing through the hot water taps thus the boiler will not ignite. (It ignites if central heating is requested) I have tried to increase the presure but nothing is happening ( its just at 1 bar). I reckon I will have to call out an engineer unless anyone can help in layman terms!!!! The boiler runs on LPG.and was fully serviced one year ago.
frame, September 2006
To all those who might have given a reply to try and help.
I have found the fault, it was an air lock in the system due to the local nearby water hydrant being used.

frame, September 2006
link Click here to see other fixes for Vokera.