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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

Glow-worm Glow-worm 30CI Heating, Home Heating Systems Glowworm Heating System

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

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Glow-worm 30CI High Pressure - Help!