What N416 means
The thermostat detected an overvoltage or overcurrent error on your HVAC equipment, which may need maintenance.
Also shown as: N417, N418, N419, N420, N421, N422, N423, depending on the model.
Likely causes
- Wiring fault
- HVAC equipment fault
Safe first checks
- With power off, check the wiring is seated properly.
When to stop
Contact a pro if your HVAC system is malfunctioning.
Checked against: Google Nest Help: Troubleshoot Nest thermostat help codes. Codes can differ by model and year, so confirm with your owner's manual.