worcester 28i greenstar is going to high

19 Aug 2010
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United Kingdom
the pressure on my worcester 28i junior is going to high, when i turn the hot water or heating on. any idea or suggestion?
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firstly, is the filling loop passing, ie open when it is shut off? If you have an integral filling loop remove the key! Does it leak water?

Is the expansion vessel full of water?

If not the above your water to water heat exch is cross leaking! If you lose the pressure out of the system and do not turn boiler on does the pressure rise on its own? if it does turn the cold isolation feed off..does it stop rising...then your heat exch is cross leaking! replace-easy job!
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