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hi OP 1. set at 22 degrees 2. actual temp is 17.5 degrees 3. yes flame symbol is showing 4. yes only 6 years old 5. brand new thermostat and batteries I assume the original wiring for old honeywell dial type thermostat was red = live, blue = neutral and yellow = switched i can only...

I have just replaced an old honeywell thermostat with a new DT90E after reading several threads on this site seemed to be a good bet. i wired it up using red to A and yellow to B and isolated blue and earth as i read they do not need to be used. the thermostat is working great with good...