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how can i fix my worcester bosch greenstar he 30?

ea appears if i turn off the yellow water tap but if i leave the water tap in the on position the central heating works unfortunately the pressure then rises past 3 and i have to turn the central heating off.
zoe, January 2010
the yellow tap is the gas valve. check the red expansion tank for air pessure with the boiler drained down of water

streamflow, January 2010
link Click here to see other fixes for Bosch Greenstar.