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Google Nest Protect alarm showing a green ring: alarm over: meaning and exact next steps

a green ring: alarm over means Conditions are returning to normal. Google says the smoke or carbon monoxide level is decreasing. This answer applies only to Google Nest Protect smoke and carbon monoxide alarms, battery-powered and wired, as described in Google's Nest Protect lights-and-sounds article. Light ring colors and messages apply to Protect; the same words on another brand's alarm do not.

On the covered Google Nest Protect alarm, a green ring: alarm over means conditions are returning to normal. Google says the smoke or carbon monoxide level is decreasing. First, make sure you are safe and have put out the source of smoke, or dealt with the source of the carbon monoxide.

Part of Google Nest Protect alarm error codes guide

Differential

Likely causes of “Google Nest Protect alarm showing a green ring”, and how to tell them apart

  1. 1

    The smoke level is decreasing

    What separates it The ring turns green after an alarm

    How to confirm Make sure the source is out

  2. 2

    The carbon monoxide level is decreasing

    What separates it The ring is green after a CO alarm

    How to confirm Deal with the source of the carbon monoxide

  3. 3

    A false alarm clearing

    What separates it Cooking vapour has passed

    How to confirm Ventilate the room

  4. 4

    A real hazard not yet resolved

    What separates it The cause is still present

    How to confirm Do not relax until the source is dealt with

  5. 5

    A reading that may return

    What separates it The level could rise again

    How to confirm Stay alert

Before you touch a setting

Record this first — changing settings destroys the evidence

  • What happened before the alarm
  • The source of smoke or CO
  • Whether anyone feels unwell
  • The alerts in the app

Try in this order

0 of 8 completed

  1. What to do first

    Reversible

    Make sure you are safe and have put out the source of smoke, or dealt with the source of the carbon monoxide.

  2. Correct only the documented fault domain

    Reversible

    Google says to make sure you are safe before you relax, because this message only means the level is decreasing.

  3. Make sure you are safe

    Reversible

    First.

  4. Put out the source of smoke

    Reversible

    If there is one.

  5. Deal with the CO source

    Reversible

    Or leave.

  6. Ventilate

    Reversible

    The room.

  7. Watch the app

    Reversible

    For further alerts.

  8. Have appliances checked

    Reversible

    If CO was involved.

Model-specific

What is true of this model and not of its siblings

Decreasing, not zero
Google says this message means the smoke or carbon monoxide level is decreasing. It is not an all clear, and the cause may still be present.
Google's advice
Make sure you are safe, and that you have put out the source of smoke or dealt with the source of the carbon monoxide.
Prevention
Keep cooking vapour away from alarms and have fuel-burning appliances serviced yearly.

Stop boundary

When this stops being a self-service repair

  • !Make sure you are safe before you relax
  • !For carbon monoxide, leave and call emergency services if anyone is unwell
  • !Have fuel-burning appliances checked

Evidence ledger

Sources behind this answer

01
Google Nest Help Nest Protect lights and sounds
02
Google Nest Help Nest Protect lights and messages

Exact questions

Common questions

What does a green ring: alarm over mean on a Google Nest Protect alarm?+

Conditions are returning to normal. Google says the smoke or carbon monoxide level is decreasing.

Is it all clear?+

Only that the level is decreasing.

What about carbon monoxide?+

Find and fix the source.

Wrong device or version?

Match the path before repeating the steps.

Match another device