How to tell if your current doorbell system will work with Nest Hello

Google Nest Hello is designed to replace your home’s existing wired doorbell. But some doorbell systems can’t deliver enough voltage to Nest Hello. So you must first check that it’s compatible.

1. If you don’t already have a doorbell

If you don’t already have a doorbell, you’ll need to purchase and install the optional Indoor Power Adapter. The adapter lets you plug Hello into an indoor power outlet. You can get visitor notifications on your phone or Google Assistant-enabled speaker.


2. If you have an intercom, front gate control or other integrated device

Some advanced doorbell systems have a built-in intercom, gate control or a doorbell that’s located far from your home (such as an outside gate). These systems typically won’t work with Nest Hello if it’s wired to the system.

However, you can install Hello with the optional Indoor Power Adapter. The adapter lets you plug Hello into an indoor power outlet instead of wiring it directly to the system. You can get visitor notifications on your phone or Google Assistant-enabled speaker.

3. Check how your doorbell and chime are powered

 

Remove your doorbell chime’s cover. Some covers simply pull
off, but others may need to be unscrewed.

Tip: Doorbell chimes, which make the sound when someone
presses the doorbell button, are usually mounted on the wall
near the front door. Many are simply box shaped, but some
chimes have decorative covers or metal tubes hanging from them.

Chime cover being removed

 

If you see two or more wires 

Your doorbell will probably work with Nest Hello, but
you need to check the voltage. Go to step 4.

Mechanical chime
two wires chime box

If you see both wires and batteries 

 

Your doorbell will probably work with Nest Hello, but
you need to check the voltage. Go to step 4.

Electronic chime
battery in electric chimebox

If you see only batteries and no wires 

Doorbell chimes that use only batteries won't work with
Nest Hello out of the box, but you have a couple options:

  • In some cases, a battery powered chime and doorbell are
    installed over old doorbell wires. If there are wires under
    your battery powered chime and doorbell, the wires may
    work with Nest Hello. Contact a local Nest Pro to check
    that your wiring is compatible and install a new wired
    chime.
  • If there are no wires behind the chime, you can purchase
    and install the optional Indoor Power Adapter, which lets
    you plug Hello into an indoor power outlet.

    When you install Hello with the adapter, your chime won't
    ring when someone presses Hello's button. But you can
    get visitor notifications on your phone or Google
    Assistant-enabled speaker.

Wireless chime
no wire battery chime box

If you see wire labels that aren't T, F or R 

If your chime has wires that aren’t labeled T (Trans) F (Front) or R (Rear) it might be compatible, but you should contact a local Nest Pro for installation.

You could also purchase and install the optional Indoor Power Adapter, which lets you plug Hello into an indoor power outlet.

4. Check the wire voltage

Nest Hello needs to be powered by wires delivering 16 - 24 V AC, and at least 10 VA (in North America) or 12 - 24 V AC and at least 8 VA (in Europe).

Tip: A traditional doorbell system uses very little power, but Nest Hello has specific power requirements so the camera can continuously record video. You’ll need to check if your current doorbell system can deliver enough power for Hello to work.

Use a multimeter to measure the voltage (best way)

The most accurate way to see if your doorbell is Nest Hello compatible is to measure the voltage on the wires. Multimeters that can precisely measure voltage are relatively inexpensive.

Important: Use a multimeter that has metal probes. “No contact” voltage testers (often shaped like a pen) may not be sensitive enough to give you a correct reading.

Warning: To avoid risk of shock, injury or death, always use caution when working with electricity. Remember, if you’re uncomfortable working with electrical wiring, you can have a professional electrician or a local Nest Pro do it for you.

  1. Remove your doorbell button. You may need a screwdriver.

  2. Disconnect the wires from the button - voltage can’t be accurately measured while still connected to the button.

  3. Follow your multimeter's instructions and measure the voltage on the wires behind your doorbell.

  4. If the measured voltage is between 14 and 30 V AC, your wiring should work with Nest Hello.

    If the measured voltage is below 14 or over 30 V AC, contact an electrician in your area to upgrade your transformer so it can work with Nest Hello.

Contact an electrician or a Nest Pro (easiest way)

local Nest Pro or trained electrician will be able to measure your doorbell wire voltage, and upgrade your system if it’s not compatible. They can also install Nest Hello for you.

Find your doorbell transformer's voltage 

Electrical transformers are typically labeled with a voltage rating. It’s usually molded or etched into the transformer’s body.

However, transformers can be difficult to locate. Common places for transformers are inside your doorbell chime box, near your breaker or fuse box, or in the basement or crawl space under your home.

Tip: If you can see wires leading out of your chime or doorbell, you may be able to follow them to your transformer if it’s installed nearby.

  • If your transformer is labeled anywhere from 16 to 24 Volts AC and 10 VA in North America or 12 to 24 Volts AC and 8 VA in Europe: Your doorbell should be compatible with Nest Hello.

  • If there’s no label, it’s labeled below 16 Volts (or 12 Volts in Europe), or over 24 Volts: Your doorbell wiring isn’t compatible with Nest Hello out of the box, but you have a couple options.

    • You can contact a local Nest Pro to upgrade your transformer so it can work with Nest Hello.

    • You can purchase and install the optional Nest Hello plug-in adapter, which lets you plug Hello into an indoor power outlet. With this option, your existing chime won’t ring when someone presses Hello’s button. Instead, you’ll get a notification on your phone or Google Assistant-enabled speaker.

Install the chime connector when required 

 

The chime connector is included in the box with Nest Hello. It
helps make household doorbell systems compatible with
Hello.

You must install it if you're connecting Hello to a compatible
wired doorbell.

common final wiring chime image

Compatible wired doorbell

If your current wired doorbell is compatible with Hello, you must install the chime connector. The Nest app will walk you through installation as part of Nest Hello setup.

Note: The chime connector allows your existing wires to deliver constant power to Hello while protecting your chime, which might otherwise be damaged from the constantly flowing current. In addition, without the chime connector, you might experience chime buzzing or unexpected chimes. So be sure to follow the steps in the Nest app to install the chime connector.

Indoor Power Adapter

If you’re installing Hello with the optional Indoor Power Adapter, you won’t need to install the chime connector because Hello won’t be wired to your doorbell system. You can recycle the chime connector as you would other electronics.

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