Google's article on sound and motion detection explains that Nest cameras look for activity and classify it; on subscription plans they can tell people, animals, vehicles and packages. If a camera misses something or alerts too much, Google's alert troubleshooting page splits it: something happened but the camera did not detect it, or the camera detected something but you got no alert. For accuracy, check the camera is on, online and pointed where you expect, with a clear view and light.
The checks in more detail
Set up Activity Zones so the camera looks only in areas you choose, which cuts alerts from roads and trees; the zones article notes that Nest Cam Indoor and Outdoor models need a Google Home Premium subscription to use them. Package alerts work better with person detection turned on. Use Home and Away modes so the camera alerts only when you are out. Familiar face detection, a subscription feature, builds a library of faces.
Check the camera's sensitivity and the detection types you enabled under Camera and doorbell alerts, and check the lens for dirt, spider webs and glare, especially at night when infrared bounces off close objects. Wind, insects and headlights can trigger false alerts. If the camera is battery powered, a low battery can limit detection. Restart it if it stops detecting altogether. Walk the route a visitor would take and check event history afterwards, since a test at one distance says little about the driveway.
Check again at a different time of day, since sun glare, shadows and headlights change what triggers detection. Adjust one zone at a time and check the result after a day of activity. Treat detection tuning as a two-week project: adjust, wait, review event history and adjust again, since one busy day and one quiet day give very different pictures. Compare what the camera saw with what happened by reviewing a clip frame by frame if the app allows, since a subject that fills only a corner of the frame may be missed even when detection works.
Differential
Likely causes of “Nest cameras and doorbells misses motion or records too many events”, and how to tell them apart
- 1
A blocked view
What separates it The camera misses activity because something blocks its view
How to confirm Reposition the camera, and clear away anything that blocks its view of the area
- 2
Zones too tight
What separates it The camera misses a spot because the Activity Zones are too tight around it
How to confirm Adjust the Activity Zones, so the spot you care about is included in the detection
- 3
Person detection off
What separates it You get no package alerts because person detection is switched off
How to confirm Turn on person detection, since package alerts work best when it is on
- 4
Glare or a dirty lens
What separates it You get false or missed events because the lens is dirty or glare falls on it
How to confirm Clean the lens and reposition the camera, so that glare does not spoil the picture
- 5
Away mode not set
What separates it You get alerts while you are at home because Home and Away modes have not been set up
How to confirm Use Home and Away modes, so that alerts change depending on whether anyone is home
Before you touch a setting
Record this first — changing settings destroys the evidence
- What the camera missed, or what it wrongly reported
- Which detection types are switched on for the camera
- How the Activity Zones are set up in the app
- The lighting at the time that the problem happened
Try in this order
0 of 7 completedCheck power and online state
ReversibleCheck the power and the online state in the app, since an offline camera detects nothing.
Check the view
ReversibleCheck the view and clean the lens, since dirt and glare are common causes of bad detection.
Turn on person detection
ReversibleTurn on person detection and the other detection types that you want, in the camera settings.
Set Activity Zones
ReversibleSet Activity Zones to include the areas that matter and to exclude the ones that do not.
Use Home and Away
ReversibleUse Home and Away modes to reduce alerts, so you are not told about movement when you are home.
Check for glare
ReversibleCheck for glare at night, since infrared light bouncing off close objects can cause false events.
Restart the camera
ReversibleRestart the camera if it stops detecting, which keeps your settings and often clears the problem.
Model-specific
What is true of this model and not of its siblings
- Indoor
- Indoor cameras need a subscription for some zone features.
- Battery
- Battery models save power between events.
Stop boundary
When this stops being a self-service repair
- !If nothing is detected with a clear view, contact Google Nest support
- !If the alerts are false, refine the Activity Zones until they cover only the area you need
Evidence ledger
Sources behind this answer
Detection.
Alerts, zones and delays.
Zones.
Plans and features.
The company and its products.
Exact questions
Common questions
Why does my Nest miss motion?+
The usual reasons are a blocked view, tight zones, or detection settings that are switched off.
Do zones need a subscription?+
On some models zones need a subscription, so check what your model and plan include.
Do package alerts need person detection?+
Package alerts work better with person detection switched on, since it helps classify the activity.
Can lights cause false alerts?+
Yes, lights and glare can cause false alerts, particularly at night with infrared.
Does a battery matter?+
Yes, a low battery can limit how the camera detects activity, so keep it charged.
What is event video history?+
Event video history means short clips that are saved when the doorbell detects activity, kept for a set time by your plan.
Can a network extender cause drops?+
Yes, it can, if the doorbell joins a weak extender, so check which access point the doorbell is actually connected to.
What is bandwidth adaptation?+
It is the doorbell lowering the video quality when the connection is slow, to keep the picture moving instead of freezing.
Can I remove the doorbell from my account?+
Yes, remove it in the Google Home app before you sell it or give it away, so the new owner can set it up.