nest Learning thermostat Installation And Configuration Manual page 28

Error
number Description
E42 Your Nest may have
tripped an internal fuse
E51
and Nest needs to be
replaced.
N1 Power wire Rc detected.
Not connected to
N21
equipment.
N2 Power wire Rh detected.
Not connected to
N22
equipment.
N3 No power to W1wire
detected.
N23
N4 No power to Y1wire
detected.
N24
N5 No power to AUX/W2 wire
detected.
N25
N6 No power to G wire
detected.
N26
N7 No power to O/B wire
detected.
N27
N28 No power to Y2 wire
detected.
N29 No power to * wire
detected.
W1 Nest can't continue to
connect to your Wi-Fi
network.
Nest Learning Thermostat installation & configuration guide
What's going on?
Your Nest either has wires that aren't fully inserted into the
connectors or has tripped an internal fuse.
Your Nest isn't electrically detecting your Rc wire, but one is
connected to the Nest base.
Your Nest isn't electrically detecting your Rh wire, but one is
connected to the Nest base.
Your Nest isn't electrically detecting your W1wire, but one is
connected to the Nest base.
Your Nest isn't electrically detecting your Y1wire, but one is
connected to the Nest base.
Your Nest isn't electrically detecting your AUX/W2 wire, but one is
connected to the Nest base.
Your Nest isn't electrically detecting your G wire, but one is
connected to the Nest base.
Your Nest isn't electrically detecting your O/B wire, but one is
connected to the Nest base.
Your Nest isn't electrically detecting your Y2 wire, but one is
connected to the Nest base.
Your Nest isn't electrically detecting your * wire, but one is
connected to the Nest base.
Your Wi-Fi access point may now fully support a Wi-Fi standard
known as power saving mode.
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