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It's called a Honeywell DT92E, and the installer ( electrician) showed me the apparatus on the wall behind the boiler, but he said it was very complicated, I should let my son do it!! My son works all hours and I have not asked him yet...I have got a 'mobile' room stat which I can't seem to programme, I don't want it at 20 all the time, especially through the night... I want it just ticking over, to get the house warm again...