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no hot water on worcester 240?

I changed the diaphram on a worcester 240 and the pin now rises and turns on the boiler but instead of the tap water getting hot the radiators do. do i need to change the whole valve?
bobby, April 2009
You may have to change whole diverter valve and may have to descale DHW exchanger.

Mr K, April 2009
link Click here to see other fixes for Worcester 240.