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Heating & cooling

Google Nest error codes

Google Nest thermostat E and N help codes, from Google's own Nest help center. Also covers Nest.

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Google Nest thermostat codes (11)

E73No power to Rc wire
E74No power to Rh wire
E1C wire or power connector needed
E2No power wires detected
E5No heating or cooling wire detected
E12No power to W1 wire
E10No power to Y1 wire (cold weather shutoff)
E52Overcurrent on HVAC wiring
N72Low power on a power wire
N416Overvoltage or overcurrent (4th gen)
E299Contact Nest support

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Error code meanings come from manufacturer manuals and support pages, but codes can differ by model and year. Always confirm with your owner's manual or the label inside your unit. Our information and AI helper are for general guidance only and are not a substitute for a licensed technician. Gas, refrigerant, combustion and line-voltage work must be done by a qualified professional. In an emergency, call 911.

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