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...
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)...