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Actuator is identical to the old one, which was also working well ist seems: And here's the block - sorry for being thick

Nowhere near anything combustion related! OK. Will try with removing a black/live from block in pic 4 and report back. Thanks all for offering advice.

Thanks for the help so far. Wiring is entirely conventional. No zones. I've put some pictures up as requested, so if they give something away that I haven't spotted, that's great.

Hello all Working on a 10 yo duotec 28. It's constantly heating radiators. The CH light at 10 o'clock is constantly lit. I have replaced with new: Stat/timer + receiver Diverter valve cartridge (original in great condition) Diverter valve actuator - which moves nicely up and down I feel...