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Tony - thanks very much for replying! The DHW diaphragm I replaced succesfully. I was having the problem of CH working ok, but needing to run the HW taps for ages to get the water to heat up - as suspected, from reading your previous entries, it was the DHW diaphragm that was torn. While...

Hi, After reading various posts I just fitted a new DHW diaphragm to my boiler which works great to switch on the hot water - the old one was torn. Thanks everyone for advice! While looking around inside the boiler I also found a different diaphram - pictures attached. I thought it was...