Gents, I refitted the diaphragm in case it was not seated correctly, I couldn't tell if it was but I took extra care when I reassembled, but I have not been able to test it as I have a leak on the bottom of the diverter valve under the DHW switch. I did not touch this as I took the pump out to...
Thanks for replying.
My manual does not have a K or L it stops at J, I have just downloaded a copy with the additional solutions.
My thought was that, as the boiler fires up if I lift the DHW flow switch the PCB was working.
Thanks
My Alpha CB24 will only produce hot water (DHW) when the central heating is running (CH). I have followed the fault finding flow chart and so far have replaced, DHW flow switch, DHW flow valve diaphragm (it was worn and had a small hole in it) and the DHW heat exchanger with no improvement. Any...