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Good morning and thank you for all the contributions. The good news is the DT90E is installed and working as I hoped it would. Thanks again to Stem for your advice, it worked. To the rest who have replied I am very grateful, had it not worked I would never have considered the suggestions made...

Stem, thanks for the reply, will give it a go tomorrow. Mrs J is fuming at the mo so will leave it working as was till she goes to work tomorrow, told you I was a simpleton. The very thought of not using a neutral would not have occurred to me. I very much appreciate the speedy reply, I will...

My existing British Gas RS1 room thermostat is in the hall and as I understand my central heating room temperature is controlled by this thermostat. The boiler is a Gloworm Ultimate and the heating and hot water programmer is a Honeywell ST6400C. The RS1 is not too accurate and I wish to replace...