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Thanks! The 'digits', i.e. 3, 6, 9 etc are showing on the display but absolutely nothing else! I did establish that there is power feeding the device and no, overloading is not possible as it's on a single lead / feed and used to be working absolutely fine last Winter!

Yep, checked that. There's definitely 230V AC supply. Could it be a fault with the thermostat itself rather than the overall heating system?

Thanks. It appears to have been wired / connected correctly as it used to work fine...

The thermostat is not doing anything. No 'CODE' or 'OFF' or anything being displayed, despite twisting, pressing and turning numerous times... Any ideas? The manual offers no help whatsoever… Cheers!