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    potterton netaheat 16/22 problem.

    hi guys have a potterton netaheat 16/22 boiler. It will only bring water up to 45c...the white rodgers gas valve will only measure 4mb even when adjusted right up. should be about 8 to 14 according to book.pressure at meter 24mb going down to 21 when boiler lit. no obvious blocks in 22mm...
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