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This is really interesting actually, good to learn more about how the place I live in works. Is the "no click" at thermostat information irrelevant? We replaced the thermostat and the central heating seems to work now. Turning it down gives a click and controls the boiler properly. Though...

Ok, thanks, fair enough. Just out of curiosity now... What makes the boiler fail to fire in the case that the valve has malfunctioned?

Are there any simpler diagnostics I can do myself to narrow down the problem (if only so I can best communicate the situation to tradesmen)?

Hi, thanks for your response. I believe it's the 1st variant. I'm not quite sure where to look, but here's a thing I found near the Sieman's pad: (3 pics of the same thing) If this isn't what we're looking for then I can look again...

Boiler: Suprima Thermostat: Drayton Programming thing: Siemens Ok, so symptom: Central heating does not work at all (no radiators are warm - not even their 'feet', and they've been bled for air) 1) Manual "extra hour" CH set on Siemens pad 2) Drayton dial turned up/down and nothing happens on...