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High pressure in glow worm 30ci?

Hi, I cant seem to get my pressure down below 1.6. i have drained the rads & it lowes it to 1.2 but seconds later it has gone back up. The high pressure is causing water to come out of overflow. Help.
Andrew, October 2010
filling loop passing, dhw heat exchanger pin holed, either way, cold mains is getting into sealed system side.
you need to find out from where. is fillind control fully shut off? that would be my first check

g, October 2010
link Click here to see other fixes for Glow-worm 30CI.