Update- just re-pressurised the system. Confirmed the leak is coming from the pipe to the left hand side of the heat exchanger. I have read on the forum that there are O rings in the joint between the pipe and the heat exchanger. How difficult is it to change them? Looks to be a bugger though as...
Well it looks like I might have got away with it on the PCB. Checked it out, looks nice and dry. Few spots of water about but none actually on the board. Ran the wife's hairdryer over everything for 10 minutes just in case.
That only leaves the leak to deal with. Sons said that he reckoned...
Been having an intermittent issue with the DHW recently. No hot water in shower some mornings. Shutting shower off and then turning back on sometimes cured it, sometimes not. Turned boiler off, did the reset and it would come back up, hot water- great. Sometimes the 60 deg light would flash...