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When I took the front off my boiler I found water had been leaking from the grub screw behind the DHW pressure differential valve - we have opened this up, the diapragm was fine but as we had bought the kit we replaced the diapragm and the nut at the front. We still had water leaking from the...

Need a little help - have been reading loads of posts on this forum and due to being poor as church mice and having a dodgy boiler with all the symptoms of a blocked plate heat exchanger (hot water running hot/ cold), I am going to attempt to clean this out. I have the manual which has very...