Would welcome the panel's thoughts/endorsement on this.
My Baxi CH/HW boiler is, for heating, controlled by an thermostat on the hall wall. It was a like/like replacement for the original which failed ten or so years ago and is simply a rotary dial and a stat that clicks on/off. Neither accurate nor reliable, was set today at 15 but was firing up the boiler even though the adjacent thermometer read over 20. Replacement with a modern and more sophisticated device is called for. Honeywell DT90E looks like the right choice - same fitting etc.
The old stat has 4 wires. Usual live, neutral and earth (sleeved green/yellow) and an additional yellow wire.
My researches suggest that the yellow is a switched live analogous to that used in switching ceiling lights.
The new Honeywell is all plastic and double insulated so needs no earth. As it's battery powered it requires no neutral either so both those wires can be abandoned and taped off etc for safety.
All I need are the live connection (red) to terminal A and B is the switched live (yellow) so only connected when the stat is closed.
Does that sound as though it's right?
Last edited by: Bromptonaut on Tue 4 Oct 22 at 17:58
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