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?
E440
G2 wire detected. Remove W2/AUX wire.
The Nest Learning Thermostat is physically detecting
a wire in the W1 connector, a wire in the AUX/W2
connector, and a G2 (fan) wire in the Y2 connector.
This indicates you have more than one stage of heat
and more than one fan speed.
The Nest Learning Thermostat does not support
multiple stages of heat and multiple fan speeds at
the same time.
E439
E442
G2 detected. G1 wire is also required.
The Nest Learning Thermostat is physically detecting
a G2 (fan) wire in the Y2 connector, but it’s not
detecting a wire in the G connector. Both wires are
required for a multi-speed fan.
G3 wire detected. G1 and G2 also required.
The Nest Learning Thermostat is physically detecting
a G3 (fan) wire in the connector, but it isn’t detecting
a G2 (fan) wire in the Y2 connector or a wire in the G
connector. All three wires are required for a three
speed fan.
E419
Y2 wire without Y1 wire.
AQ and star wire conflict.
The Nest Learning Thermostat is physically detecting
a Y2 wire, but not a Y1 wire that is required for
2-stage conventional cooling systems or 2-stage
heat pumps.
E450
The Nest Learning Thermostat has detected a wire in
the AQ connector and a wire in the * connector, both
of which are configured as humidifiers (or
dehumidifiers). The Nest Learning Thermostat
doesn’t support connecting 2 humidifiers or 2
dehumidifiers at the same time.
E448
No system power.
The Nest Learning Thermostat does not detect power.
If a C wire is present, then power is not detected on the
C wire. If a C wire is not present, and this is a single
transformer system, then power is neither detected on
Y1 nor on W1, or if this is a dual transformer system,
then power is not detected on Y1.
88
| 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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