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These units are completely obsolete, and although I can see where your coming from, the inevitable truth is that you should upgrade your system to a new boiler. You may find that any Gas Safe Engineer would quote a price that makes the repair un-economical...not for rip-off purposes, but...

Could possibly be the 3 port valve. If the valve's closing you may be getting a 'water bounce'. Does the system have a bypass valve?. Has it been closed. Test the 3 port valve by putting the heating off, then the hot water to see if there is any noise. if the bypass valve is closed, open...

I recommend Glowworm, go on their courses, become an accredited installer with them, and therefore offer a 5 year warranty. The boilers are backed by my company, (as the installer), and we are always the first port of call for my customer should a problem arise, backed by the manufacturers'...