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Worcester Greenstar 28i - Heating and hot water will not work at same time?

I can't get the CH & HW to work at the same time for some reason. They work seperately but not together. I suspect it's do with controls / electrical. Any ideas?
KT, December 2011
hot water usually has priority over heating.

mikr, December 2011
link Click here to see other fixes for Worcester Greenstar.