nest Learning thermostat Installation And Configuration Manual page 27

Error
number Description
E10 No power to Y1wire
detected.
E30
E11 Heat pump wireO/B
detected. No heat pump
system present.
E13 Heat pump can have at
most one auxiliary heat
E33
wire.
E34 Dual fuel requires an
alternate heat wire.
E35 Dual fuel can have at
most two alternate heat
wires.
E36 Heat pump can have at
most one auxiliary heat
wire.
E37 Heat pump can have at
most one auxiliary heat
wire.
E38 Heat pump can have at
most one auxiliary heat
wire.
E39 Y2 wire without Y1wire.
E40 W3 wire without W2/AUX
wire.
E41 E wire without O/B wire.
Nest Learning Thermostat installation & configuration guide
What's going on?
Your Nest is physically detecting a wire in the Y1 connector but isn't
detecting any power to it.
Your Nest is physically detecting a wire in the O/B connector but
isn't detecting any power to it.
You may need to update your Nest's software.
Your Nest was previously setup as a single fuel system with auxiliary
heat put it's detecting both W1 and AUX/W2 wires that aren't
supported in that configuration.
Your Nest was previously setup as a dual fuel system but it's not
detecting a W1, AUX/W2 or * (W3) wire that is required to have
alternate heat.
Your Nest was setup as a dual fuel system, but the W1, AUX/W2 and
* (W3) wires are configured as alternate heat wires.
Your Nest was previously setup as a single fuel system with auxiliary
heat, but it's detecting W1, AUX/W2 and * (W3) wires that aren't
supported in that configuration.
Your Nest 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.
Your Nest was previously setup as a single fuel system with auxiliary
heat, but it's detecting AUX/W2 and * (W3) wires that aren't
supported in that configuration.
Your Nest 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.
Your Nest is physically detecting a * (W3) wire but not a W2/AUX wire
that is required for 3 stage conventional heating systems.
Your Nest 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.
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