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over pressure?

pressure increases and blows safty valve
j parker, November 2007
Make sure that the filling loop taps are fully turned off. these can be identified by looking for a bradded hose under the boiler with a small plastic tap on it,or they could be built into the pipe-work, look for a screw head and make sure that the line on top of the screw head does not run line with the pipe.

Mic., November 2007