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Wiring error quick reference guide

When Nest senses what wires have been connected to its base, it automatically configures its software for

the system type it detects. If it’s a heat only system, Nest won’t show any cooling options. If it’s a heat

pump, Nest will know—and do a special test to check the orientation of the O/B wire.

If Nest senses a problem with the wiring, you’ll get an error if the issue must be fixed before setup can

continue, or a note if it is not critical to fix during setup. Here’s a breakdown of the errors and notes and

what they mean.

Specific troubleshooting help for wiring errors is available online at nest.com/support.

Error

number

Description

What’s going on?

Common wire C required.

This wiring error may appear after installation when Nest can’t get

power while the system is turned on. Nest’s software should be

updated if this error appears

E22

No power wires detected.

Rh or Rc wire is required.

You’ll see this error when either a Rh or Rc wire was not installed or

the Rh or Rc wire that was installed isn’t powered.

E23

No power to Rc wire

detected.

You’ll see this error if you’ve installed both an Rc wire and Nest isn’t

electrically detecting it.

E24

No power to Rh wire

detected

You’ll see this error if you’ve installed both an Rh wire and Nest isn’t

electrically detecting it

E25

No heating or cooling

wires detected.

W1 or Y1 wire is required

Nest cannot detect any wires inserted into W1 or Y1. At least one of

these is required.

Too many wires detected.

This error indicates that the wiring combination you’ve installed is

no supported by Nest. Verify the actual wiring for the system and

remove at least one of O/B, W1, Y1 or AUX wires as appropriate.

E27

Y1 wire not detected.

Heat pump requires a Y1

wire.

Your Nest is physically detecting a wire in the O/B connector. This

connector is exclusively used for heat pumps which also require a

Y1wire to be attached.

E28

Additional wire(s)

required. AUX/W2

detected by itself.

Your Nest is physically detecting a wire in the AUX/W2 connector.

Supported configurations that use this connector also include a W1

wire or an O/B + Y1 wire.

E29

No power to C wire

detected.

Your Nest is physically detecting a wire in the C connector, but isn’t

detecting any power to it.

Nest Learning Thermostat installation & configuration guide

Page 24

Содержание Learning thermostat

Страница 1: ...stallation configuration guide Need help Help online http support nest com certified Nest Certified Professional support 1 855 VIP NEST 1 855 847 6378 Hours 5am 9pm pacific 8am midnight eastern Last updated April 17 2013 Version 2 0 ...

Страница 2: ...stems 8 Wiring diagrams Heat Pump Systems 12 Wiring diagrams Humidifiers and Dehumidifiers 15 Configuring Nest with Pro Setup 18 What is Pro Setup 18 How do I enter Pro Setup 18 How do I use Pro Setup 18 How do you configure special systems 19 How To Quick Reference Guide 21 Wiring error quick reference guide 24 Troubleshooting 28 Handling unusual thermostat wiring 28 Quick Troubleshooting Referen...

Страница 3: ...uit breaker Turning off the power to the system while replacing the thermostat protects both you and the equipment Determine wiring compatibility before opening Nest packaging Just a simple test would all the wires on the current thermostat have a home on Nest s base Take off the cover of the old thermostat and look at the wires Check them against the list of available connectors on the box or vis...

Страница 4: ...Nest you need to run each part of the system for a few minutes This will ensure that Nest s installed correctly and there aren t any HVAC compatibility issues Brief feature overview Quickly walk through the Welcome Home guide included with Nest Your customer will learn the basics of controlling their system so you don t get call backs Installation details For help with installation please refer to...

Страница 5: ...o stage conventional cooling one stage gas oil electric solar geothermal systems one stage heat pump with auxiliary heat zone systems with or without dampers Available connectors Y1 Y2 G O B Rc W1 W2 AUX C E W3 HUM DHUM Rh Rh W1 Y1 G C O B W2 AUX Rc Networking requirements Wi Fi recommended Required for remote control Wi Fi 802 11 b g n 2 4 GHz Auto pairing device to user accounts Wireless softwar...

Страница 6: ...sor Power Power sharing with built in rechargeable Li ion battery 7 10 year battery life No external power required No common wire required with most installations Power sharing with built in rechargeable Li ion battery 7 10 year battery life No external power required No common wire required with most installations Display 24 bit color 320 x 320 pixel display 1 75 diameter 24 bit color 320 x 320 ...

Страница 7: ...Mercury free 100 recyclable packaging Operation Operating temp 0 C to 40 C 32ºF to 104ºF Operating humidity 0 RH to 90 RH Storage temp 20 C to 45 C 4ºF to 113ºF Storage humidity 40 RH to 80 RH Operating temp 0 C to 40 C 32ºF to 104ºF Operating humidity 0 RH to 90 RH Storage temp 20 C to 45 C 4ºF to 113ºF Storage humidity 40 RH to 80 RH Compressor Lockout 2 5 minute minimum delay between compressor...

Страница 8: ... valve relay Rc 24VAC power from cooling transformer Rc Not used W1 Stage 1 heat relay W1 Stage 1 heat relay W2 AUX Stage 2 heat relay W2 AUX Auxiliary heat relay C 24VAC common wire C 24VAC common wire Stage 3 heat W3 humidification HUM or dehumidification DEHUM Emergency heat E humidification HUM or dehumidification DEHUM Rh 24VAC power from heating transformer Rh 24VAC power from transformer No...

Страница 9: ... W1 Not usually used Y1 Stage 1 cooling compressor relay Y1 Stage 1 compressor contact G Fan relay G Fan relay C 24VAC common wire C 24VAC common wire O B Not used O B Changeover valve AUX W2 Stage 2 heat relay AUX W2 Auxiliary heat relay Rc 24VAC power from cooling transformer Rc 24VAC power from cooling transformer No jumper wires required You don t need to hang on to any old jumper wires going ...

Страница 10: ...nsformer systems use Rh for the heating transformer and Rc for the cooling transformer Conventional 2 stage heating Conventional 2 stage heating Conventional 2 stage heating Label Function Y1 Compressor Relay Stage 1 Y2 Compressor Relay Stage 2 G Fan Relay O B Heat Pump Changeover Valve Rc 24VAC power from cooling transformer W1 Heat Relay Stage 1 W2 AUX Heat Relay Stage 2 Auxiliary Heat Relay C 2...

Страница 11: ...mer and Rc for the cooling transformer Conventional 1 stage heating and 1 stage cooling Conventional 1 stage heating and 1 stage cooling Conventional 1 stage heating and 1 stage cooling Label Function Y1 Compressor Relay Stage 1 Y2 Compressor Relay Stage 2 G Fan Relay O B Heat Pump Changeover Valve Rc 24VAC power from cooling transformer W1 Heat Relay Stage 1 W2 AUX Heat Relay Stage 2 Auxiliary He...

Страница 12: ...e Rh for the heating transformer and Rc for the cooling transformer Conventional 2 stage heating and 2 stage cooling Conventional 2 stage heating and 2 stage cooling Conventional 2 stage heating and 2 stage cooling Label Function Y1 Compressor Relay Stage 1 Y2 Compressor Relay Stage 2 G Fan Relay O B Heat Pump Changeover Valve Rc 24VAC power from cooling transformer W1 Heat Relay Stage 1 W2 AUX He...

Страница 13: ...e Rh for the heating transformer and Rc for the cooling transformer Conventional 1 stage heating and 2 stage cooling Conventional 1 stage heating and 2 stage cooling Conventional 1 stage heating and 2 stage cooling Label Function Y1 Compressor Relay Stage 1 Y2 Compressor Relay Stage 2 G Fan Relay O B Heat Pump Changeover Valve Rc 24VAC power from cooling transformer W1 Heat Relay Stage 1 W2 AUX He...

Страница 14: ... for the heating transformer and Rc for the cooling transformer 1 stage heat pump with aux heat 1 stage heat pump with aux heat 1 stage heat pump with aux heat Label Function Y1 Compressor Relay Stage 1 Y2 Compressor Relay Stage 2 G Fan Relay O B Heat Pump Changeover Valve Rc 24VAC power from cooling transformer W1 Heat Relay Stage 1 W2 AUX Heat Relay Stage 2 Auxiliary Heat Relay C 24VAC Common Wi...

Страница 15: ...mper wire required For dual transformer systems use Rh for the heating transformer and Rc for the cooling transformer 2 stage heat pump 2 stage heat pump 2 stage heat pump Label Function Y1 Compressor Relay Stage 1 Y2 Compressor Relay Stage 2 G Fan Relay O B Heat Pump Changeover Valve Rc 24VAC power from cooling transformer W1 Heat Relay Stage 1 W2 AUX Heat Relay Stage 2 Auxiliary Heat Relay C 24V...

Страница 16: ...rmer and Rc for the cooling transformer 2 stage heat pump with aux heat and emergency heat 2 stage heat pump with aux heat and emergency heat 2 stage heat pump with aux heat and emergency heat Label Function Y1 Compressor Relay Stage 1 Y2 Compressor Relay Stage 2 G Fan Relay O B Heat Pump Changeover Valve Rc 24VAC power from cooling transformer W1 Heat Relay Stage 1 W2 AUX Heat Relay Stage 2 Auxil...

Страница 17: ...s required during operation Nest s STAR terminal is a powered terminal If connecting to a humidifier dehumidifier that requires connection to unpowered terminals add a 24VAC relay suitable for HVAC equipment use Consult humidifier dehumidifier installation manual for wiring requirements Important Note In dual transformer set ups where there is both an Rh and an Rc wire connected to Nest Nest will ...

Страница 18: ...he other wire from the Humidifier No relay is recommended Stand Alone Humidifier 2 Wire This system has a humidifier that is separate from the HVAC system Install the 2 hum wires directly into the relay Run the single wire from the relay to the terminal at Nest Nest recommends the White Rogers 90 290Q or similar 24VAC HVAC relay Nest Learning Thermostat installation configuration guide Page 16 ...

Страница 19: ...m the relay to the terminal at Nest Nest recommends the White Rogers 90 290Q or similar 24VAC HVAC relay Built in Humidifier System 1 Wire This system has a humidifier built in to its HVAC system and only 1 hum wire Connect the hum wire from the built in system directly to the terminal at the Nest No relay is recommended Nest Learning Thermostat installation configuration guide Page 17 ...

Страница 20: ... Setup on the Nest Learning Thermostat after initial setup Go to SETTINGS EQUIPMENT CONTINUE CONTINUE PRO SETUP Read the disclaimer Only continue if you re an HVAC professional How do I use Pro Setup Pro Setup gives you the ability to identify and configure how Nest should control each wire you connect to the Nest base When you first enter Pro Setup you ll see an image of the Nest connectors Conne...

Страница 21: ...will first ask if the heating system is dual fuel or single fuel For single fuel any wires inserted into the W1 W2 AUX or if W3 is chosen connectors will be treated as auxiliary heat that will be used simultaneously with the heat pump when needed Pro Setup will automatically configure the auxiliary heat wire for an electric forced air system The 2nd generation Nest Learning Thermostat can only sup...

Страница 22: ...ese systems require cooling to be activated to turn on dehumidification Dehum Standalone These dehumidifiers can be engaged independently and do not require heating or cooling to be active Pro Setup will show a To dehum setting that specifies whether the wire should be energized or not to turn on dehumidification Two Stage Heat Pumps The 2nd generation Nest Learning Thermostat will use System Matc...

Страница 23: ...als to configure how Nest controls each wire connected to the base Using Pro Setup is required to when using Nest with dual fuel systems e g heat pump with furnace humidifiers and dehumidifiers Pro Setup is only available with the 2nd generation Nest Learning Thermostat Pro Setup also offers configuration choices for other types of systems such as two stage heat pumps and emergency heat It is avai...

Страница 24: ...these steps Press the ring to bring up the menu Select the Red and Blue dots Turn the ring to select HEAT COOL HEAT COOL or OFF Press the ring again to select Heat Pump Setting compressor and auxiliary lockout temperatures Both auxiliary and compressor lockout temperatures can be changed in the Heat Pump section of the Advanced Settings menu By default Nest will lock out the auxiliary heater when ...

Страница 25: ...teps 1 Press the ring to bring up the menu 2 Turn the ring and select SETTINGS 3 Turn the ring and select ADVANCED 4 Turn the ring and select SAFETY TEMP Set screen brightness 1 Press the ring to bring up the menu 2 Turn the ring and select SETTINGS 3 Turn the ring and select BRIGHTNESS 4 Keep pressing the ring to scroll through the different options low medium high or auto Set temperature display...

Страница 26: ...power to Rc wire detected You ll see this error if you ve installed both an Rc wire and Nest isn t electrically detecting it E4 E24 No power to Rh wire detected You ll see this error if you ve installed both an Rh wire and Nest isn t electrically detecting it E5 E25 No heating or cooling wires detected W1 or Y1 wire is required Nest cannot detect any wires inserted into W1 or Y1 At least one of th...

Страница 27: ...ne auxiliary heat wire 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 E37 Heat pump can have at most one auxiliary heat wire 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 E38 Hea...

Страница 28: ...rically detecting your Y1wire but one is connected to the Nest base N5 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 N6 N26 No power to G wire detected Your Nest isn t electrically detecting your G wire but one is connected to the Nest base N7 N27 No power to O B wire detected Your Nest isn t electrically detectin...

Страница 29: ...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 Important Note These errors may change with future software updates Visit nest com support for the latest information Nest Learning Thermostat installation configuration guide Page 27 ...

Страница 30: ...connected to the old thermostat that B is a common wire and should be connected to the C connector on Nest Important Note If you have a B wire that is actually a common wire not following the rules above can lead to blowing a fuse on your HVAC controller board and most likely damaging Nest When X W1 or W2 is an AUX wire Some heat pump installations may have the auxiliary heat connection labelled a...

Страница 31: ...at pump systems Heating or cooling is always on or on intermittently when Nest is not calling for it Heating or cooling does not activate when Nest calls for it Heating or cooling intermittently deactivates while Nest is still calling for it In these situations Nest can t successfully charge from the Y or W wires without interfering with the normal operation of the heating and cooling system There...

Страница 32: ...rnace provides another current path to the thermostat which reduces the voltage input at the detect circuit to prevent false heat calls Note that this resistor will draw a couple of watts during call for heat or cool if the resistor is added to Y and it will become warm Make sure to mount the resistor so that it is not in contact with any wires or system components Between heat or cool calls the r...

Страница 33: ...es This may happen if you ve forgotten to turn the power back on to the HVAC system or if you turned the power back on but there was a fuze or breaker blown during the installation process Use normal electrical troubleshooting techniques to isolate the issue to either the fuse breaker box or a fuse on the HVAC controller board Unit seems to be running backwards If it is heating when it is supposed...

Страница 34: ...g and that their Wi Fi network is online If it is check the Nest system status in the upper right of nest com support Nest will publish maintenance or outage information there The last thing to check is if the customer s Wi Fi router is compatible with Nest Wi Fi troubleshooting help can be found here http support nest com wi fi Forgot Lock Code Customer has forgotten the lock code to their Nest N...

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