The nest gets its battery charge from R to Y1. If the Y1 line is broken it won't charge. Y1 is the wire that goes to the outside A/C condenser.
Why is there no power to the Y1 on my nest?
Second: No power to Y1 is an indication of a problem with the AC. Sometimes condensate overflow or low on refrigerant. To check disconnect wires from the Nest base. Then twist together the Rh, G, and Y1. This should turn on the AC and fan. Let it run for at least 20 minutes.
Can I install a Nest thermostat on a Y1?
Put it on Y1. Nest will give an error if there is a wire on Y2 without one on Y1. thanks! Installation went smooth and it works perfectly. I appreciate the help!
What does W1 and W2 mean on Nest Thermostat?
Heating and Cooling: 1 stage of heating (W1) and cooling (Y1) and a second stage of either heating (W2) or cooling (Y2). The Nest Learning Thermostat E is designed to work even if your home doesn't have a common C wire, but installation of a new C wire or the Nest Power Connector may be required in rare cases.
How does the Y1 line work?
So as long as there is a wire in the Y1 terminal..... the charge is handled thru the Y1 line. If you have a low charge the pressure switch will open the Y1 circuit. When you add a direct C connection to the nest it no longer needs to steal power.
How do I fix Nest error Y1?
The Y1 wire is actually just for cooling. It appears that error code often indicates too much voltage on the wire. This could be a problem with the HVAC system rather than the thermostat. If this is a new Nest installation verify the wiring to ensure it is correct.
What is the difference between Y1 and Y2 on Nest thermostat?
In conventional cooling systems, Y/Y1 controls the first stage of cooling and Y2 controls the second stage, which helps cool down the home faster. In heat pump systems, Y1 controls your compressor, which heats and cools your home.
Does Y wire go to Y1 or Y2?
Of the Y, Y1, and Y2 wires, Y or Y1 go to the Y terminal and Y2 to the Y2 terminal. The O/B wire can have many configurations. It can be W-O/B, O/B, W-O, W-B, or even separate O and B wires. If you have separate O and B wires, tape off the B wire so it doesn't make contact and connect the O wire to the O/B terminal.
What color is the Y1 wire?
YellowStandard Thermostat Wiring Labels, Wire Colors and Their Functions –LabelsColorsFunctionsBBlueReverse Valve For HeatingGGreenIndoor Fan/Air HandlerY1YellowCoolingY2Light Blue/Others2 Stage Cooling9 more rows•Aug 30, 2021
What are the Y1 and Y2 wires on thermostat?
In standard systems, Y/Y1 controls the first stage of cooling, and Y2 controls the second stage. The combination of these wires helps regulate the temperature of your home more efficiently.
What happens if you wire a thermostat wrong?
Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.
What is the Y2 wire on a Nest thermostat?
Y2 is the thermostat wire for second stage of cooling. Y wire is for the first compressor (air conditioner units) and Y2 wire is for the second compressors (air conditioner unit).
Where does the Y2 wire go on a Nest thermostat?
Correct, you have single-stage heating with two stages of cooling and the */OB terminal is where the Y2 would go. Correct, you have single-stage heating with two stages of cooling and the */OB terminal is where the Y2 would go.
What is the Y terminal on a thermostat?
Y - This is the terminal for cooling or air conditioning and goes to the compressor relay. Typically a thermostat wire pull is made to the air handler on split systems and then this wire is spliced for the separate wire pull which is made to the condenser.
What does Y1 mean on thermostat?
cooling systemY or Y1. In most systems, the Y or Y1 wire controls your cooling system. If you have a heat pump, your Y or Y1 wire controls your compressor. Your compressor is responsible for heating and cooling your home.
What color wires go on a Nest thermostat?
To wire up your Nest Thermostat, simply: Connect the Red wire from the transformer to either the Rc or Rh terminals (as they are connected internally) Run the White Wire from the furnace to the W terminal. Connect the Yellow Wire from the compressor to the Y Terminal.
What color wire is emergency heat?
whiteThe wires are typically arranged as follows: red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (although the common wire may be a different color).
What is the Y2 wire on a Nest thermostat?
Y2 is the thermostat wire for second stage of cooling. Y wire is for the first compressor (air conditioner units) and Y2 wire is for the second compressors (air conditioner unit).
How do I know if I have 2 stage cooling?
0:373:14How Do You Verify Second Stage? - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou will have a wire or Y to the Y to wire. Will essentially control whether you're at first stageMoreYou will have a wire or Y to the Y to wire. Will essentially control whether you're at first stage capacity. Or if you bump up to 100% capacity which will be second stage.
What is W2 and Y2 thermostat?
W2 wire – heat. Y wire – cooling compressor. Y2 wire – cooling compressor. RH (or) R wire – power. G wire – fan.
What do the letters mean on thermostat wiring?
The wires are typically arranged as follows: red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (although the common wire may be a different color). You can also refer to the Conductor Color Chart (see Chart 6, thermostat wire).
What is Y1 wire?
Y1 is the wire that goes to the outside A/C condenser.
Why is Y1 disconnected?
Y1 can be disconnected due to a safety switch. One safety is in the outside unit that is triggered when it senses low pressure/temperature. Another safety switch is usually attached to the furnace/air handler's condensate overflow switch.
How does a 24VAC nest work?
Refer to the diagram. The 24vAC comes into the nest on R. R connects to the internal battery. The battery needs a connection to C so by being inline it gets it's C from the air handler thru the contactor, thru the low pressure switch and to the Y1 connection. So as long as there is a wire in the Y1 terminal..... the charge is handled thru the Y1 line. If you have a low charge the pressure switch will open the Y1 circuit.
What does Y1 loss mean?
A Y1 loss means a break in the wiring somewhere from the stat to the contactor in the outside condenser.
When you add a direct C connection to the nest, does it need to steal power?
When you add a direct C connection to the nest it no longer needs to steal power.
What is Y1 and Y2 wire?from ifixit.com
Y1 and Y2 wires might be used instead if you have a two-stage system (i.e. a high level for extremely hot or cold days, and a low level for mild days). W, W1, W2: Just like the Y wire, the W wire (s) control the heating aspect of your system. O, B, O/B: These wires are responsible for switching the changeover valve in a heat pump system.
What is the RH wire on a Nest thermostat?from support.google.com
Note: Don't connect any Jumper wires to the Nest thermostat. Rh. If you don’t have an Rc wire, the Rh wire is the power wire for both your heating and cooling systems. If you have an Rh and an Rc wire, the Rh wire is the power wire for your heating system.
How to tell if a multistage system is a single stage?from support.google.com
Single stage systems will only have one wire for heating (in the W or W1 connector) and one wire for cooling (in the Y or Y1 connector). Single stage heat pumps only have Y1 for both heating and cooling.
How many fan speeds does a Nest thermostat have?from support.google.com
Multistage systems typically only have one fan speed while single stage systems sometimes have multiple fan speeds. 1st, 2nd and 3rd generation Nest Learning Thermostats can support systems with either multiple fan speeds or with multiple stages of heating and/or cooling.
How hot does the second stage of the Nest thermostat turn on?from support.google.com
Before your Nest thermostat has activated Time To Temperature, the second stage of heating or cooling will turn on when you adjust the set point 3.3°F beyond the current temperature, while the third stage will need a change of at least 7°F to activate.
Why does my Nest thermostat turn on?from support.google.com
If your system’s first stage of heating or cooling won’t reach your desired temperature in a reasonable amount of time, your Nest thermostat will turn on additional stages of heating or cooling to ensure that you’re kept comfortable.
Why is the common wire used in Nest thermostats?from support.google.com
Because the common wire is used to provide consistent power to the thermostat, it’s important to determine what function a wire labeled B serves before connect ing it to a Nest thermostat.
What is the G wire on a Nest thermostat?from smarthomeperfected.com
Check your Nest thermostat wiring and you’ll likely find a G-wire, conveniently in green. You have the option to use this for the C-terminal if you don’t have a C-wire in place. This is a convenient way to get the needed power to your thermostat. But it does have its caveats.
What type of fuel does a Nest thermostat use?from support.google.com
Google Nest thermostats are designed to work with most 24 V systems, even older systems. They work with all common fuel types including natural gas, oil, and electricity.
What is the ideal Voc, Vin & lin voltage on a Nest Thermostat?from smarthomeperfected.com
In the Device Information > Power section of Settings, you’ll find the Battery section. Here you’ll find Voc, Vin, and lin readings of your Nest thermostat. These indicate the flow of electricity through your wiring. Check that these readings don’t go below a certain level.
What if my Nest Thermostat is continually showing a low voltage?from smarthomeperfected.com
For most low voltage warnings you probably need a C-wire to provide the needed power.
Does Nest thermostat save energy?from support.google.com
Your Nest thermostat starts learning on day one, so it’s up to you to teach it good habits to help save energy. You can set your own heating or cooling schedules or have your thermostat Auto-Schedule for you.
Can you replace stranded wires in a Nest thermostat?from support.google.com
Note: If your wires are stranded, you may be able to contact a local pro to cap, solder or replace stranded wires with a solid core wire, which will work with the Nest thermostat. The method may depend on your local electrical code requirements.
Is Google Nest thermostat proprietary?from support.google.com
If your system only has two wires, but you have both heating and cooling, your system is likely proprietary. Proprietary systems aren’t compatible with Google Nest thermostats.
Does Nest thermostat have sunblock?
One nest is reading about 6-7 degrees higher during the day in a room that gets lots of natural light, but the new nest doesn't have a sunblock function. I get that I should have researched more in advance, but I didn't expect my newer thermostat to be a downgrade.
Is there any possibility to find Nest Protect smoke detectors on discount?
I know power companies discount the thermostats but wish we could grab dome protects for less than $120
What is Y1 wire?from doityourself.com
Y1 is the wire that goes to the outside A/C condenser.
Why is Y1 disconnected?from doityourself.com
Y1 can be disconnected due to a safety switch. One safety is in the outside unit that is triggered when it senses low pressure/temperature. Another safety switch is usually attached to the furnace/air handler's condensate overflow switch.
How to check if Nest thermostat is compatible?from support.google.com
Usually, you just remove your thermostat’s cover and enter the wires you find into the compatibility checker. The Nest app and Home app will also let you know if your system is compatible and give you a wiring diagram for installation.
What is the RH wire on a Nest thermostat?from support.google.com
Note: Don't connect any Jumper wires to the Nest thermostat. Rh. If you don’t have an Rc wire, the Rh wire is the power wire for both your heating and cooling systems. If you have an Rh and an Rc wire, the Rh wire is the power wire for your heating system.
Why is the common wire used in Nest thermostats?from support.google.com
Because the common wire is used to provide consistent power to the thermostat, it’s important to determine what function a wire labeled B serves before connect ing it to a Nest thermostat.
How does a 24VAC nest work?from doityourself.com
Refer to the diagram. The 24vAC comes into the nest on R. R connects to the internal battery. The battery needs a connection to C so by being inline it gets it's C from the air handler thru the contactor, thru the low pressure switch and to the Y1 connection. So as long as there is a wire in the Y1 terminal..... the charge is handled thru the Y1 line. If you have a low charge the pressure switch will open the Y1 circuit.
What does Y1 loss mean?from doityourself.com
A Y1 loss means a break in the wiring somewhere from the stat to the contactor in the outside condenser.
Why is Y1 disconnected?from doityourself.com
Y1 can be disconnected due to a safety switch. One safety is in the outside unit that is triggered when it senses low pressure/temperature. Another safety switch is usually attached to the furnace/air handler's condensate overflow switch.
How does a 24VAC nest work?from doityourself.com
Refer to the diagram. The 24vAC comes into the nest on R. R connects to the internal battery. The battery needs a connection to C so by being inline it gets it's C from the air handler thru the contactor, thru the low pressure switch and to the Y1 connection. So as long as there is a wire in the Y1 terminal..... the charge is handled thru the Y1 line. If you have a low charge the pressure switch will open the Y1 circuit.
How to eliminate a loop in a thermostat?from justanswer.com
2. You can eliminate a loop by disconnecting the yellow/red wire and connecting the thermostat wire to the blue/red wire direct. If that does not blow the fuse the short is in your yellow/red. If it still blows the fuse then its in your blue/red loop.
What to do if Y1 wire is broken?from justanswer.com
You might have a broken Y1 wire I suggest turning off power and picking a different color wiring. Switch it at the Nest thermostat and at the furnace or air handler.If this resolved the issue please rate your experience. It’s the only way I can close out the call. If you need further assistance let me know.
What is the voltage of the Y and C wires?from reddit.com
At the condenser, the voltage on the Y and C wires are 0, while connected to the contactor. If I undo the wires from the contactor, I get ~26v and the Nest does not give any errors and works as if the condenser is connected (but isn’t) If I push in the plunger on the contactor, the condenser starts until I let go.
When you add a direct C connection to the nest, does it need to steal power?from doityourself.com
When you add a direct C connection to the nest it no longer needs to steal power.
What is the yellow wire with a red stripe on the thermostat?from justanswer.com
OK so the yellow wire with a red stripe is your high pressure switch and the blue wire with a red stripe is the low pressure switch. The way this system works is the 24V call comes through the thermostat wire and links to the Yellow wire with a red stripe. The 24V travels though that wire past the high pressure switch and then on to the blue wire with red stripe loop and then goes through the low pressure switch and back to the contactor. If both switches are closed your contactor turns on.
1. Turn off the main power to your system at the breaker box
- Before you turn off the power, make sure each wire coming to your thermostat is a different colo…
Your system can have multiple breakers, so make sure to turn them all off before moving on. Once the power to your whole system is off, check your furnace and fan. Make sure there are no lights that might indicate your system still has power.
2. Test that power is off
- Try to turn on your system. If you have both heating and cooling, try to activate both as each co…
1. Turn the temperature up on your thermostat at least 5 degrees to try to turn on your furnace. - 2. Wait at least 5 minutes to check if your system turns on (you’ll need to wait because many sys…
3. Turn the temperature down on your thermostat at least 5 degrees to try to turn on your AC.
3. Remove your system's panel
- Once you’re sure you’ve turned off the power, look for a removable panel on your system. It may …
To learn more about removing your system’s panel, consult the user guide for your HVAC system or contact a local pro in your area.
4. Look for the wire connectors
- When you’ve removed the panel, look for the control board. It looks like a circuit board and usuall…
• If you need help finding your HVAC system’s control board, consult the user guide for your HVAC system or contact a local pro in your area. - Look for connectors that have labels that are the same as your thermostat. For instance, you mi…
Look at the labels where these wires connect to the control board to determine what each wire attached to your thermostat should be labeled.
5. Take a picture of the wire connectors
- Take a picture of the wires and connectors on your system’s control board. Make sure the connector labels are clearly visible.
6. Close your system's panel
- Some systems have a safety feature that will keep them from turning on unless the panel is fully closed. If your system doesn’t turn on after you’ve turned the power back on, double check that the panel is shut properly and that any latches are secured.
7. Use the Nest or Home app to get a wiring diagram
- The in-box instructions will let you know which app to use for setup: the Nest app or Google Home app. When you begin setup with the app, you’ll get a custom wiring diagram. Now that you have a picture of the wires connected to the control board, you can use it as a reference to enter wires into the app and help make sure that your wiring diagram is accurate for installation.
More help with wire labels
- Thermostat wires with two labels
• Some thermostats have wire connectors with two sets of labels: one for conventional systems, one for systems with a heat pump. You need to know whether you have a heat pump or conventional system so you know which thermostat labels to enter into the Nest compatibility c… - • If you put wires into the wrong thermostat connectors during setup can, this can cause your sy…
Important: The side that the wires come out of the connectors doesn’t matter. In the picture above, you might assume that this thermostat is connected to a conventional system because the wires are coming out of the conventional side of the connectors. In fact, this thermostat is actua…
What thermostat wire labels mean
- Below are some of the wire labels you might find on your thermostat and what they do.
The app will give you a custom wiring diagram to help you install the Nest thermostat. Refer to the following article for step-by-step installation instructions. - How to install your Nest thermostat
Note: If you don’t find your wiring labels in this article, contact a local pro.