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trouble with worcester boiler d.h.w?

hi,iv'e got a worcester 24cdi boiler and the central heating water's ok but the domestic water doesn't get very hot even if left running.A "plumber"changed the diverter valve but still the same,any ideas would be helpfull,cheers,vic.
vic doughty, November 2008
Lots of things to check on this one.. DHW sensor, gas pressures (don't TOUCH it if you ain't corgi), scaled plate heat exchanger, pcb..

BunSlinger, November 2008
link Click here to see other fixes for Worcester.