Thanks for answers.
In this case I slept somewhere else cos it was cold. When I came back boiler / CH were working properly. Both timer and thermostat now had solid green lights , as did boiler.
I dunno, likely user error. Maybe lack of patience.
Thanks for suggestions/comments
Hi
i have circa 15 year old Volkera Compact 24 boiler, seems almost sane as:
https://library.plumbase.co.uk/flipbooks/RE/vokcom24_20480_t/mobile/index.html
it is in my kitchen, next to it external 24hr timer and power switch, with thermostat control in hall.
i was changing the on/off hours...