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Had our Halstead ace high serviced,cos no dhw?

Next day no dhw,plumber came back, fitted new rubber (DIVERTER?)VALVE.When heating came on no dhw.Anyone know whats going on please?
Tony, November 2009
make sure flow switch is operated when tap turned on...if so could be thermister on plate heat exchanger??

darren ( gascare ) s-o-t, November 2009
link Click here to see other fixes for Halstead Ace High.