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  1. M

    Intermittent Boiler circulation errors

    Hi, Looking for some opinions regarding an issue with my CH. It's a open vented system, 5 rads and a GW HX12 which is nearly two years old and was throwing F22 & F25 errors. I've had someone out; they've cut out the H section which was blocked, and it's been powerflushed. There was an AWFUL...
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