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Why does the hot water keep going cold?

I have a Worcester 280 RSF Combi boiler, the hot water keeps going cold, but the central heating is working fine. What is the cause of this & how do I get it fixed. Is there some sort of thermostat needs replacing?
Kev, December 2008
sounds like the divertor valve

stuart priestley, December 2008
ihad same problem with my 24i just put on a new thermistor on the hot water side that cured it cost 7 quid

simon, December 2008
link Click here to see other fixes for Worcester.