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Turned of supply to DHW and pressure does drop on gauge this has got to be the problem as before i did this i drained a bucket of water out the C/h system and the proplem of rising pressure still existed i have also checked the expansion tank for water coming from air side and this is fine.

The loop is disconected as need to insert the key to pressurise and i have removed this

an electric cooker is classed as fixed equipment so does not have to have a RCD protection but,if the cooker isolator incorporates a 13amp socket outlet then it will need RCD protection

My Worcester 35cdi keeps building up pressure i suspect it is iether the water to water heat exchanger or the water diverting valve as the relief valve keeps lifting can any body help me.