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My heating system is a Heat Line Compact gas boiler. When i turn on the boiler to heat the rads the pressure guage goes up to 5 and water comes out of the overflow pipe. Can you tell me what the problem might be? Thank you, Damien.

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Yes, your pressure is too high or your expansion tank is bad or the relief valve is bad. The water is expanding when heated and no place to expand too. I suspect the expansion tank. If you can get to it, tap it with a tip of a screw driver. It should sound hollow.

Posted on Sep 19, 2008

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