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  1. M

    Need help adjusting the system pressure gauge on my boiler

    Hi there! I have a Greenstar 12i system Worcester boiler. A few minutes ago the system pressure gauge dropped all the way to red 0 and I need to get it back to at least green 2. I was shown how to adjust it: the boiler comes with a key which you stick into a hole in the bottom of the boiler...
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