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I'll replace the batteries. I did mention in my original post that this is an irregular problem. I.e. it worked yesterday when I switched it to override, today ....... - who knows.(n)

Thanks, DP. If I were to switch my electric supply off at the fuse box I would then know whether it is wireless or not. I'll try it.

I made a mistake: the thermostat is a Drayton. See photo attached, tho not very clear. Can't see a model number.

My Honeywell room thermostat is wall mounted and wireless and on occasion if I wish to over-ride or boost the central heating outside of the normal settings the signal doesn't always seem to be picked up by the boiler. Is the 'receiver' within the boiler? Neither I nor my plumber or electrician...