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How can i fix my boiler Wourcester BF?

The boiler is being used as a vented system, the hot water part works alright, but when the central heating is used the boiler runs for a few minutes and then cuts out. The pressure on the gauge shows 0.5bar.

Any help with this is much appreaciated.
Thanks
Mark
Mark Gibbs, March 2007
sorry didn't read question properly

hi-spec plumbing, March 2007
How do increase the pressure in a vented system?

Mark, March 2007
the pressure needs to be 1-1.5 bar

hi-spec plumbing, March 2007