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I have a glow worm betacom 24c -water pressure is at 3?

when the heating comes on, the pressure keeps rising up to 4 so I have to switch it off. The first 3 red lights are lit.
Moira, September 2013
What is the water pressure when cold?.Should be around 1.1-1.2 bar.If it isn't bleed rads until it is

ups, September 2013