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hot water heating system in the red

Posted by Linda on November 16th, 2002 03:38 PM

We have a hotwater heating system with radiators. Everytime I turn the furnace on to heat the house, the pressure goes in the red and starts to blow out the pressure release valve and starts to make a loud banging noise.We have to hurry and shut the thermostat off for the pressure to drop. Any ideas as to what's wrong? We thought maybe the circulating pump. We thank you in advance. HELP!!!!

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