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Just answering my own question (in case somebody comes and does a search on this fault in the future...) Dry joint on the PCB - resoldered, and now working perfectly :D

Thanks for the link - fortunately, I had a copy of the servicing instructions already. Unfortunately, I can follow the chart all the way down to the box that tells me that the system is working normally. Except it isn't :cry:

I have a puma 100e which has just developed a fault - the hot water is working fine, but the central heating seems to be completely dead... when the timer calls for heating (or I switch to "constant"), I hear a faint click a second or so later (like a relay switching somewhere?), but nothing...