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  1. #1
    Administrator
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    Feb 2012
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    169

    Nest thermostat error codes

    Below is a list of Nest thermostat error codes

    Error Description
    E1 Common wire required. The E1 error will appear if the air conditioning or heating is running and the Nest can not draw power. A software update may solve this issue.
    E2 No power wires detected. The E2 error will appear if there is no power on the RC, RH wire or if no wire is installed on Rc, Rh. Make sure that the power is on to the HVAC unit and that the wire to the RC, RH push connector is installed properly. Try resetting the push connector for the Rc, Rh wire.
    E3 The E3 error will appear if both the Rc and Rh terminals have wires attached and the RC terminal does not have power. Make sure that the power is on to the equipment that powers the cooling unit and RC terminal.
    E4 The power (Rh) wire isn’t working. Power isn’t detected.
    E5 The E5 error will appear if the Nest detects that there is not wires connected to the W1 or Y1 terminals. There must be a least one wire connected to the W1 or Y1 terminal. Check the push connector for the W1 and Y1 terminal to make sure they are seated properly.
    E6 Too many wires detected. The E6 error will appear if the wiring combination of wires connected to Nest is not supported. Verify the actual wiring for the system and remove wires from Nest as appropriate.
    E7 The E7 error appears when the O/B wire is connected but no Y1 wire detected. When the Nest is connected to a heat pump there must be wires connected to the O/B and Y1 terminals. Verify the wires are connected properly and that the wires are installed in the push connector properly.
    E8 Stage two heat wire AUX/W2 detected by itself. The E8 error will appear if a wire is connected to the AUX/W2 terminal and but no wire is detected in the W1 terminal if the Nest is connected to a conventional system or if the Nest is connected to a heat pump no wires detected to O/B and Y1.
    E9 Common wire (C) detected. The E9 error will appear if the Nest C terminal has a wire connected but the wire is not connected to transformer common side.
    E10 Cooling wire Y1 detected. The E10 error will appear if there is a wire connected to the Nest Y1 terminal and the Nest detects that the wire is not connected to the equipment. Check the wiring connections. Your Nest may requirer a common wire.
    E11 Heat pump wire O/B detected. The E11 error will appear if there is a wire connected to the O/B terminal and the Nest detects that the wire is not connected to the equipment. Check the wiring connections.
    E12 No power to W1 wire detected. The E12 error will appear if there is a wire connected to the W1 terminal and the Nest detects that the wire is not connected to the equipment. Check the wiring connections.
    E13 Heat pump can have at most one auxiliary heat wire.
    E14 Dual fuel requires an alternate heat wire.
    E22 You need (R, Rh or Rc) power wires.
    E23 The power (Rc) wire isn’t working. Power isn’t detected.
    E24 The power (Rh) wire isn’t working. Power isn’t detected.
    E25 The E25 error will appear if the Nest detects that there is not wires connected to the W1 or Y1 terminals. There must be a least one wire connected to the W1 or Y1 terminal. Check the push connector for the W1 and Y1 terminal to make sure they are seated properly.
    E27 When a heat pump (O/B) wire is detected, you need a heating/cooling (Y1) wire.
    E28 Stage two heat wire AUX/W2 detected by itself. The E28 error will appear if a wire is connected to the AUX/W2 terminal and but no wire is detected in the W1 terminal if the Nest is connected to a conventional system or if the Nest is connected to a heat pump no wires detected to O/B and Y1.
    E29 The common (C) wire isn’t working. Power isn’t detected.
    E30 The cooling (Y1) wire isn’t working. Power isn’t detected.
    E32 No power to W1 wire detected.
    E33 Heat pump can have at most one auxiliary heat 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. Your Nest was previously setup as a single fuel system with auxiliary heat put it’s detecting, W1, AUX/W2 and star (W3) wires that aren’t supported in that configuration.
    E37 Heat pump can have at most one auxiliary heat wire. Your Nest was previously setup as a single fuel system with auxiliary heat put it’s detecting, W1 and star (W3) wires that aren’t supported in that configuration.
    E38 Heat pump can have at most one auxiliary heat wire. Your Nest was previously setup as a single fuel system with auxiliary heat put it’s detecting AUX/W2 and star (W3) wires that aren’t supported in that configuration.
    E39 Y2 wire without Y1 wire. 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.
    E40 W3 wire without W2/AUX wire. Your Nest is physically detecting a star (W3) wire but not a W2/AUX wire that is required for 3 stage conventional heating systems.
    E41 E wire without O/B wire. Your Nest is physically detecting a Star connection (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.
    E42 Your Nest either has wires that aren't fully inserted into the connectors or has tripped an internal fuse. If a internal fuse has tripped your nest may need to be replaced
    E43 Your Nest either has wires that aren't fully inserted into the connectors or has tripped an internal fuse. If a internal fuse has tripped your nest may need to be replaced
    E44 Your Nest either has wires that aren't fully inserted into the connectors or has tripped an internal fuse. If a internal fuse has tripped your nest may need to be replaced
    E45 Your Nest either has wires that aren't fully inserted into the connectors or has tripped an internal fuse. If a internal fuse has tripped your nest may need to be replaced
    E46 Your Nest either has wires that aren't fully inserted into the connectors or has tripped an internal fuse. If a internal fuse has tripped your nest may need to be replaced
    E47 Your Nest either has wires that aren't fully inserted into the connectors or has tripped an internal fuse. If a internal fuse has tripped your nest may need to be replaced
    E48 Your Nest either has wires that aren't fully inserted into the connectors or has tripped an internal fuse. If a internal fuse has tripped your nest may need to be replaced
    E49 Your Nest either has wires that aren't fully inserted into the connectors or has tripped an internal fuse. If a internal fuse has tripped your nest may need to be replaced
    E50 Your Nest either has wires that aren't fully inserted into the connectors or has tripped an internal fuse. If a internal fuse has tripped your nest may need to be replaced
    E51 Your Nest either has wires that aren't fully inserted into the connectors or has tripped an internal fuse. If a internal fuse has tripped your nest may need to be replaced
    N1 Power wire Rc detected. The N1 error will appear if there is a wire connected to the Rc terminal and the Nest detects that there is no 24vac on the Rc terminal. Check the wiring connections. Verify that the wire to the RC push connector is installed properly.
    N2 Power wire Rh detected. The N2 error will appear if there is a wire connected to the Rh terminal and the Nest detects that there is no 24vac on the Rh terminal. Check the wiring connections. Verify that the wire to the Rh push connector is installed properly.
    N3 Heating wire W1 detected. The N3 error will appear if there is a wire connected to the W1 terminal and the Nest detects that there is not voltage on the wire. Check the wiring connections. This may be normal on some systems
    N4 Cooling wire Y1 detected. The N4 error will appear if there is a wire connected to the Y1 terminal and the Nest detects that there is not voltage on the wire. Check the wiring connections. For some system this may be normal. The system may need a common wire.
    N5 No power to AUX/W2 wire detected. Your Nest isn’t electrically detecting your AUX/W2 wire, but one is connected to the Nest base.
    N6 No power to G wire detected. Your Nest isn’t electrically detecting your G wire, but one is connected to the Nest base.
    N7 No power to O/B wire detected. Your Nest isn’t electrically detecting your O/B wire, but one is connected to the Nest base.
    N8 No power to Y2 wire detected. Your Nest isn’t electrically detecting your Y2 wire, but one is connected to the Nest base.
    N9 No power to star wire detected. Your Nest isn’t electrically detecting your star wire, but one is connected to the Nest base.
    N21 No power to Rc wire detected. Your Nest isn’t electrically detecting your Rc wire, but one is connected to the Nest base.
    N22 No power to Rh wire detected. Your Nest isn’t electrically detecting your Rh wire, but one is connected to the Nest base.
    N23 No power to W1 wire detected. Your Nest isn’t electrically detecting your W1 wire, but one is connected to the Nest base.
    N24 No power to Y1 wire detected. Your Nest isn’t electrically detecting your Y1 wire, but one is connected to the Nest base.
    N25 No power to AUX/W2 wire detected. Your Nest isn’t electrically detecting your AUX/W2 wire, but one is connected to the Nest base.
    N26 No power to G wire detected. Your Nest isn’t electrically detecting your G wire, but one is connected to the Nest base.
    N27 No power to O/B wire detected. Your Nest isn’t electrically detecting your O/B wire, but one is connected to the Nest base.
    N28 No power to Y2 wire detected. Your Nest isn’t electrically detecting your Y2 wire, but one is connected to the Nest base.
    N29 No power to star wire detected. Your Nest isn’t electrically detecting your star wire, but one is connected to the Nest base.
    W1 Failed to connect. Your Wi-Fi access point may now fully support a Wi-Fi standard known as power saving mode.
    W2 Failed to connect. Your Wi-Fi access point may have security settings enabled that prevent your Nest from connecting.
    W3 Failed to connect. Your Wi-Fi access point is not providing a network IP address to your Nest.
    W4 Failed to connect. Nest is connected to your wireless network but not to the internet.



  2. #2
    Administrator
    Join Date
    Feb 2012
    Posts
    169
    Nest Error codes updated.

 

 

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