Why is my Nest not getting power?

If your Nest Thermostat won’t turn on, the batteries could have drained or there could be a power issue. If there’s a power issue, your thermostat’s battery will drain and it’ll turn off Wi-Fi, the display, and other features to preserve battery life.

How do I fix my Nest wiring problem?





Quote from the video:
Quote from Youtube video: Sitting in between the on and off locations flip that offending breaker off and then back on again and then check to see if your system has power.

How do I know if my Nest Thermostat is wired correctly?

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.

Does Nest Thermostat require special wiring?

Not all systems have a C wire installed, but Nest thermostats were engineered to use as little power as possible for their display and internal circuitry. So in many cases, they don’t need a C wire. But if you find that you need a C wire with a Nest thermostat, you can install the Nest Power Connector.

Why does my Nest say no power to R wire?

This is by far the most common error to encounter and if you get the error message “E195 – No power to R detected”, there can be a variety of causes but is most likely caused by a tripped float switch and you don’t want to ignore it!

How do I fix no power to Rc wire?





The E73 error on your Nest thermostat indicates that there is no power detected to the Rc wire. To fix this error, check your wiring, air filter, drain tubes/drip pans, and HVAC fuse and ensure that all of them are working correctly.

How do I know if my Nest thermostat is bad?

8 Common Nest Thermostat Problems

  1. Bad battery life.
  2. Thermostat motion sensing won’t work.
  3. Your thermostat occasionally disconnects from Wi-Fi.
  4. Your system suddenly turns on or off, or won’t turn off.
  5. Your system is making strange noises, including chattering, stuttering, clicking or thumping.

What is the Rh wire on a thermostat?

red heating

The RH wire refers to “red heating” which means that this is the connection you need in order to power the heating system of your air conditioning unit. Yes, even your air conditioning unit has a heating system to keep the temperature in balance.

Where do thermostat wires go?



Thermostat Wiring Tips



The W wire is connected to your heating system. If your thermostat controls your heat, you will have a white wire. The Y wire is yellow and connects to your air conditioning compressor. The G wire is green and connects to the fan.

How do I connect the wires to my Nest Thermostat?

Quote from the video:
Quote from Youtube video: Simply hold down the connector button and push the wire all the way.

How many wires should my thermostat have?

2 wires



The most basic thermostat has 2 wires; usually a red and a white wire. Two wire thermostat wiring is used for furnaces only and usually doesn’t need a “C” or “Common” wire. That’s why we only need two wires: Red wire for power (24h).

How many wires are needed for a Nest thermostat?

How Many Wires Does Nest Learning Thermostat Need? Typically, four. This is parallel to the standard four wires that most standard thermostats use.

Does Nest work with 4 wires?

Quote from the video:
Quote from Youtube video: Now our C in RH in a four wire nest. System are typically basically the same thing they're just inputs for power. So you can have the our terminal. Power going to either RH or RC.

Can I use a Nest Thermostat with only 2 wires?

The Nest Thermostat is compatible with 2 wire low voltage HVAC systems that are either heat only systems or cooling only systems.

What color is C wire on thermostat?



Blue wires

Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.

Is RC and C wire the same?

Hi there! The C and Rc wires are not the same. To install this thermostat you should follow the exact same wiring of the previous thermostat.

How do you identify C wire?

When you open your thermostat, you can quickly identify your C-wire among five coloured wires by locating the wire (usually blue) connected to ‘terminal C. You may find there are fewer than five wires, or there is no wire attached to terminal C. It’s possible that the wires are tucked inside the wall.