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Hi, I tried and i can here the DT90 switching however the boiler is not responding. The bad news is that I don't have a multi tester. From the old back plate (dark brown) I can say for sure that the old one was a Honeywell stat and that it has a part number of 4200 3878 on it. Looking at...

Hi, I have just moved in to my new home and have found the room thermostat is damaged and not working correctly. The front cover is missing so I'm not sure what model the thermostat actually is. It is wired: Terminal 1 : Red (fairly sure this is Live) Terminal 2 : Blue (fairly sure this...