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How can my Worcester condensing combi boiler be fixed?

We have a Worcester Greenstar condensing combi boiler and after 6 trouble free years, water keeps going cold. first noticed in shower and hot for 2 mins then cold. have to turn tap off and on again half way and keep doing that to get hot water for about 2 mins at a time. Similar probelm when filling the bath. Had diverter replaced but problem back after a week or so. no problem with heating - help!
Shirley, September 2012
It's not diverter valve hot water heat exchanger is blocked get engineer to clean or replace

ltd, September 2012
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