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Just to confuse things a little further, the CH clicked on right on time last night at 6pm (when it's set for) and seemed to be working fine (status S.4). When the hot water was turned on, CH turned off (as supposed to) and boiler went through HW cycle. On turning the HW off, the boiler went...

So would this point to the main control board being faulty and not providing the correct signal to tell the boiler to turn on?

They are both (CH and HW) turned up to about 55C and the temp changes as you move them, so don't appear to be stuck at all.

Have an issue with our ecoTEC 831 boiler. Having returned from a short break, we have no CH, but HW is fine. Boiler is showing an S.30 status (no heating demand from external controls). The timer unit (timeswitch 140) seems to be functioning OK (the HW is switching on and off when it should)...