How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask JamesI Your Own Question
JamesI
JamesI, Property Manager
Category: Plumbing
Satisfied Customers: 1895
Experience:  I have installed new and maintained existing kitchens, bathrooms, and heating systems and even a swimming pool.
75967336
Type Your Plumbing Question Here...
JamesI is online now

I have a standard Honeywell Thermostat which has three wires

This answer was rated:

HiI have a standard Honeywell Thermostat which has three wires plus earth going into it...Brown Going to No 1
Grey with Blue Outer Sheath Going to No 2
Black with Brown Outer Sheath Going to No 3I want to replace this with a NEST Thermostat, I know which bunch of connectors it goes to in the base of the NEST Thermostat but need advice as which coloured wire to put into which NEST connector.I have photo's of Honeywell Thermostat, still wired up and working Plus it's wiring diagram and Wiring diagram for NEST thermostat.Help neededCheersDave
Customer: replied 1 month ago.
I have uploaded pictures to help

Good afternoon, what version of the NEST thermostat are you using.

The black wire going to terminal 3 of the thermostat is your switched live, and the one you should connect to the NEST call for heat terminal, is this what your looking for?

JamesI and other Plumbing Specialists are ready to help you
Customer: replied 1 month ago.
thanks, ***** ***** that mean...
black wire goes to 3 on nest
Brown wire goes to L on nest
Grey/blue wire goes to N on nestDon't know what version of NEST it is, sorry
Customer: replied 1 month ago.
Thanks James, worked a treat :-)Dave