User Guide

COMPATIBILITY CHECKER

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COMPATIBILITY CHECKER
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My old thermostat has two labels for each connector Affected products: 3rd gen Nest Learning Thermostat, 2nd gen Nest Learning Thermostat, 1st gen Nest Learning Thermostat Some thermostat wire connectors have two sets of labels: one for conventional systems, one for systems with a heat pump. You’ll need to know which set of labels to use when you enter your thermostat’s wires into the Compatibility Checker. Here’s how to tell.
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On this thermostat, the labels for conventional systems are on the inside of the connectors and the labels for heat pump systems are on the outside of the connectors. If you know what kind of system you have, use the labels for that system. If you're unsure, the color of the wires can be a clue. For example, in the photo above, the connector labeled O/B for heat pumps is also labeled W for conventional systems.