Help with wiring NEST Thermostat from Honeywell ST9120C

H

Hetters

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Hi All!

I've bought a NEST learning thermostat 3rd Gen with a wireless controller. When I opened up my Honeywell thermostat on the boiler, it was wired with Live, Neutral, Earth, and the 1 and 4 wires:


IMG_5133.jpeg


I followed the advice of a thread online which said to wire everything the same on the NEST except for the 1 and 4 wires, which should go into 1 and 3 respectively. This made the NEST come on and connect, but the call for central heating didn't work. I heard the nest click but it didn't bring the boiler online. Can anyone advise what I've done wrong as I'm new to this!

I've included an image of the NEST heatlink with black lines indicating where I put the relevant wires! :)

IMG_5134.jpeg


Thanks very much in advance everyone. This is all very new to me! :)
 
Hetters said:
I followed the advice of a thread online which said to wire everything the same on the NEST except for the 1 and 4 wires, which should go into 1 and 3 respectively.
Click to expand...
Just shows, you shouldn't trust anything you read on the internet! ;)

Try terminals 2 and 3 on the Heat link instead.
 
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