Google Nest Learning Thermostat (4th gen) Installation Guide
Reference Material - Wiring Error Quick Reference Guides
Wiring error quick reference guide – continued
Important note: These errors may change with future soſtware updates. Visit support.google.com for the latest
information.
Error #
Description:
What’s going on?
N408
No power to Y2 wire detected.
The Nest Learning Thermostat isn’t electrically
detecting the Y2 wire, but one is connected to the Nest
base
N409
No power to (star) wire detected.
The Nest Learning Thermostat isn’t electrically
detecting the * wire, but one is connected to the Nest
base.
N410
N411
N412
N413
A C wire or Nest Power Connector is
recommended for your thermostat.
There is insufficient power from Y1 and W1 to power
the thermostat.
Low power to C wire.
The Nest Learning Thermostat detected abnormally
low power available from the C wire.
Your HVAC system needs maintenance.
Power availability from the Y wire declined to below
what the thermostat needs to run.
In extremely cold weather (i.e. blizzard), no
power to Y1 wire detected.
The Nest Learning Thermostat has shut down the
compressor due to cold weather and thus is no longer
receiving power from Y1.
N414
N415
No power to AQ+ wire detected.
AQ- requires AQ+.
The Nest Learning Thermostat isn’t electrically
detecting the AQ+ wire, but one is connected to the
Nest base.
The Nest Learning Thermostat is physically detecting
an AQ- wire but not an AQ+ wire that is required for
2-wire ventilators, humidifiers, or dehumidifiers.
E421
E443
E (emergency heat) wire without O/B wire.
G2 and O/B wire conflict.
The Nest Learning Thermostat is physically detecting a
* (E) wire but not an O/B wire. O/B is a heat pump wire,
and Nest only supports the use of emergency heat
with heat pump systems.
The Nest Learning Thermostat has detected a G2 (fan)
wire in the Y2 connector, and a wire in the O/B
connector. This wiring indicates a multi-speed fan and a
heat pump. The Nest Learning Thermostat doesn’t
support multi-speed fans on heat pump systems.
87
| General | Details |
|---|---|
| Name | Google Nest Learning Thermostat (4th gen) Installation Guide |
| Make | Nest |
| Language | English |
| Filetype | PDF (Download) |
| File size | 17.85 MB |
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