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worcester greenstar?

my worcester greenstar 440 drops pressure when the hw is used it starts to make a noise like the pump is running dry, however the ch side is fine and pressure rises as it should have set the pressure at about 1 bar certainly no more than.
paul, December 2012
Need to fill pressure 1.2bar all time look like it's running at low

ltd, December 2012
link Click here to see other fixes for Worcester Greenstar.