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Using emergency heat with nest thermostats some heat pump systems include a feature called emergency heat which is a heat source typically activated by a manual switch or button on the thermostat and can be used if the primary heating system isnt functioning. This is a brief overview of heat pump thermostat wiring always refer to your instructions when wiring up a system to ensure you are wiring to the manufactures requirements this video is intended . O if theres an orange wire in the connector labeled both w and o b then you likely have a heat pump put this wire in the nest thermostats o b connector o if theres a white wire in the connector labeled both w and o b then you probably dont have a heat pump put this wire in the nest thermostats w connector. I have a lennox heat pump with electric emergency aux heat i also have a humidifier im getting an e33 error and nest thermostat is telling me that i can only have one auxiliary heat wire the diagram on nest indicates that w1 and w2 are aux heat and ob is heat pump from what ive been reading w1 is primary heat w2 is aux heat and o b is for the reversing valve. Honeywell heat pump nest thermostat wiring diagram and the way to install if it comes to installing nest thermostat then you need to take care of honeywell heat pump nest thermostat wiring diagram either you like it or not knowing the diagram helps you install and set up the device correctly there is not anything to be worried about it