E87
- Heat pump can have at most one
auxiliary heat wire
The Nest Thermostat was previously setup as a single fuel system with
auxiliary heat, but it’s detecting W1 and * (W3) wires that aren’t supported in
that configuration.
E88
- Heat pump can have at most one
auxiliary heat wire
The Nest Thermostat was previously set up as a single fuel system with
auxiliary heat, but it’s detecting AUX/W2 and * (W3) wires that aren’t supported
in that configuration.
E89
- Y2 wire without Y1 wire
The Nest 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.
E90
- W3 wire without W2/AUX wire
The Nest Thermostat is physically detecting a * (W3) wire but not a W2/AUX
wire that is required for 3 stage conventional heating systems.
E91
- E wire without O/B wire
The Nest 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.
E92
E93
E94
E95
E96
E97
E98
E99
E100
E101
- Your Nest may have tripped an internal
fuse and Nest needs to be replaced
The Nest Thermostat either has wires that aren't fully inserted into the
connectors or has tripped an internal fuse.
E102
E103
E104
E105
E106
E107
E108
- The Nest Thermostat has an
overcurrent error
The Nest Thermostat may be wired incorrectly, or your system may be
incompatible.
E109
- G2 detected. G1 wire is also required
The Nest 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.
E110
- G2 wire detected. Remove W2/AUX
wire
The Nest 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 Thermostat does not support multiple stages of heat and multiple fan
speeds at the same time.
E111
- G2 wire detected. Remove E wire
The Nest Thermostat has detected a G2 (fan) wire in the Y2 connector, and an
emergency heat wire in the connector. The Nest Thermostat doesn’t support a
multi-speed fan and emergency heat together.
E112
- G wire detected. G1 and G2 also
required
The Nest 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.
E113
- G2 and O/B wire conflict
The Nest 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 Thermostat doesn’t support this kind of system.
N71
- Power wire Rc detected. Not
connected
The Nest Thermostat isn’t electrically detecting the Rc wire, but one is
connected to the Nest base.
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