Replacing Honeywell CM927 with Nest-E

[Sarah Harte]

Help!
So, we got a free Nest E from our electricity supplier, and want to install it to replace or wireless Honeywell thermostat.

I’ve found other posts that say that for the ‘posh’ Nest , wire A on the Honeywell goes into 2 on the Nest Heat Link and that wire B goes into 3, with the L and N going into corresponding L and N on the Nest heat link.
The trouble is, the heat link for the Nest-E doesn’t have a L, N, 2 or 3!!
The options we have are C, NO, FP, OT1 and OT2.

All help gratefully received, thank you.

 

[flameport]

Switch the power off first - some of those wires are at 230V even when the heating isn't on.

Red and yellow connect to C and NO. The other terminals are not used.

The blue and black wires are not required, but MUST be put into their own separate insulated connectors.

 

[Sarah Harte]

Thanks Flameport, but surely that’s way too easy? I thought, looking at the diagrams that might be the case, but assumed I was missing something! Thanks again.