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- 30 Apr 2020
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Hi there,
I very new to this site but I am looking for some help on how switch my honeywell thermostat over to a Google nest thermostat which I have put a picture of the wiring diagram, but I have hit a wall as took off the cover of honeywell I noticed that the wiring is not the some. As you see from pictures I got X2 red wires 1x black wire and x2 yellow and green which I know is Earth. The 2 red wires are going into No1 and No3 and black wire is in No
Now I know that No1 is the power with No3 being comms but what is black because as I turn the heating on red No3 and black No2 comes alive and heating come on. The heating is on a timer which is in the airing cupboard to were my hot water tank is. Anyone who can help I would be very grateful.
I very new to this site but I am looking for some help on how switch my honeywell thermostat over to a Google nest thermostat which I have put a picture of the wiring diagram, but I have hit a wall as took off the cover of honeywell I noticed that the wiring is not the some. As you see from pictures I got X2 red wires 1x black wire and x2 yellow and green which I know is Earth. The 2 red wires are going into No1 and No3 and black wire is in No
Now I know that No1 is the power with No3 being comms but what is black because as I turn the heating on red No3 and black No2 comes alive and heating come on. The heating is on a timer which is in the airing cupboard to were my hot water tank is. Anyone who can help I would be very grateful.