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cold water supply jammed?

Hi, I have Ravenheat Combi boiler. I turned of Cold water supply to the boiler yesterday to replace leaking pipe. After replacing it, i am trying to turn water supply on but Isolating valve is hardy 5% - Any quick fix?
Imran, August 2010
Hi, I have Ravenheat Combi boiler. I turned of Cold water supply to the boiler yesterday to replace leaking pipe. After replacing it, i am trying to turn water supply on but Isolating valve is hardy moving 5% - Any quick fix? So cold water supply flow is very low....

Imran, August 2010
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