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my 280cdi is pressurising up?

My worcester 280cdi is gaining pressure over a period of 3 - 4 days. I'm on my fourth plate heat exchanger.
One fitted on warranty plus 3 out. any ideas or sollutions would be most welcome. The boiler is 8 years old and not had any other faults.
PHIL NICS, February 2009
filling loop is not passing is it?????????????????

stubow, February 2009
link Click here to see other fixes for Worcester.