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Posted by HeatPro on March 30, 2005 at 16:54:28:
In Reply to: WORCESTER 240 Over pressurising? posted by Tony on March 30, 2005 at 10:21:16:
You will need to check that the domestic water cold line has a valve that is shut off to prevent further filling of the heating system. As the domestic tap hot water is heated in a heat exchanger, there is usually a remote unlikely chance there is a hole there to fill the system through the exchanger. Without a way for more water to enter the system there is no way that the increase can continue; so you must look for the way the sytem is being filled.