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Posted by HeatPro on November 19, 2005 at 11:18:05:
In Reply to: Worcester Bosch 240 high pressure on CH posted by ian on November 18, 2005 at 17:05:09:
If you disconnect the cold water source pipe (filler loop valve), then the pressure can't rise unless it is due to a bad expansion tank. It will get you closer to the source of the problem quicker than leaving the make-up water connected to mask the cause.