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Thanks! Would it be beneficial to just make the neutral safe and leave it behind the thermostat in the wall if it is not required? Just for my own education.... The switched live from the programmer would constantly supply power to the thermostat when the CH is on The Call for heat only has...

Hi D_hailsham, Already done this! I get a constant 230v on 1 when the CH is on and 230v comes on and off on 3 when turning the dial. I think the thermostat itself is broken. Thanks Paul

So the drayton digistat 30002 looks the best fit for us. I’ve attached a screen shot of the wiring diagram. Would I be right In Thinking that Honeywell term 1 -> Digistat ‘COM’ Honeywell term 2 -> Digistat ‘N’ Honeywell term 3 -> Digistat ‘ON’ Or have i got it all completely the wrong way...

Hi Stem, That’s great, thanks for getting back to me. Apologies for the confusion, I meant to ask if the DS1-L was a suitable replacement for the T40. Are you able to recommend a digital thermostat that would get around the issue of having the power cut out to it when the CH goes off on the...

Hello, I'm currently looking to change my central heating thermostat. At present i have a Honeywell T40 and was looking to replace it with a thermostat with a digital temperature readout. I have been looking around and a Heatmiser DS1-L looks to fit what i'm looking for. I also have a Siemens...