Nest E compatible?

[Dashy999]

Hi,

Wondering if some kind person on here happens to know whether my Honeywell cm907 thermostat can be swapped out for a Nest E thermostat? Currently I have the honeywell connected to my gas combi boiler and the thermostat controls the heating alone.

The screen on the honeywell has failed (a common issue I believe) so I thought it would be a good time to upgrade and modernise a little.

I've removed the front panel from the battery powered honeywell and can see only two wires (brown and black) attached into A & B (see attached photo).

Every other guide and installation video I've seen shows other thermostats with more than 2 wires, so I'm unsure whether my wiring would work with the Nest E. I can't figure out by researching online where the two wires would go in this case.

Any words of wisdom would be much appreciated, I'm delaying pulling the trigger on the purchase until I'm confident my wiring will work!

Many thanks

Ash

 

[Deleted member 267285]

If the Nest e supports 230vac switching then it’s fine. Unless you can test the wiring?

 

[muggles]

You'd need to put the Nest E receiver where the CM907 is, as Nest E needs to sit on a table stand and be plugged in, but it would work

 

[Dashy999]

Thanks for the replies, I'll order and give it a go and let you know how I get on

 

[Dashy999]

Just an update, installed the nest thermostat E and heat link E (where my old thermostat was on the wall) and everything working very well.

The wiring was actually very easy, the nest app walks you through the installation for the heat link, in the end I just needed to put the brown wire into C terminal and the black wire into NO terminal.

Thanks for you replies earlier, hopefully this thread helps someone in the future.