Honeywell Chronotherm iii to Nest Learning - wiring help

[BobE]

Hi, just purchased Nest Learning Thermostat.   The wires are not matching up to the Nest and wondering if there is anyone who can advise?  Here's a pic of existing....Honeywell Chronotherm III

[zoeuvre]

Hi BobE, 

Thanks for posting here in the Community forum and for showing interest in our Nest Thermostats. Your thermostat wires should be wired to the Nest Learning Thermostat base as follows:

• O wire to OB
• W wire to W1
• G wire to G
• R wire to RH
• B wire to C
• Y wire to Y1

Also, here's a guide for the installation and setup of a Nest Learning Thermostat. 

Let us know if you have any other questions. We're happy to help. 

Best,

Zoe