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OK, so as I wrote my post, I could already see the obvious answer - change the PCB board. I still had the original board, so I changed it back. It now works with heating and hot water as normal. So much for the new PCB! I noticed the brown box "transformer"? on the board was hot when I...

Have been trying to get to the bottom of this for a while. Have had the problem since replacing the PCB to try and get round another issue with having to press Reset after flame detection failure. I have replaced the 3-way-valve, as at one point I could only get intermittent hot water even...