Help wiring replacement Honeywell to Nest 3rd gen

thermostat

Need help with identifying wires on Honeywell TH9320WF5003, using Nest compatibility checker to replace with Nest gen 3

One of wires look like "W- O/B, not sure which wire it really is nest doesn't have this wire option?

On Honeywell I have wires going into C, RC, R, W- O/B, Y, G

Home has 5 zones baseboard heating and 2 zones a/c, replacing one of thermostats that controls both a/c and heat

picture of thermostat connectors, top right connector has me confused, looks like "W- O/B"
enter image description here

Best Answer

As per https://www.doityourself.com/forum/thermostatic-controls/596703-honeywell-nest-thermostat-wiring-help.html

I used following wire mapping from honeywell to nest and I have been up and running for a few days without issue

C = C

Rc = Rc

Y = Y1

G = G

R = Rh

W = W1

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