If the app shows your M3 sensor as offline, work through the steps below in order. Most sensors reconnect after a router reboot or a power cycle; start there before trying anything more involved.
First: check the status light
Press the front button on the M3 sensor to check its current status. The light colour tells you exactly what is wrong and points you to the right fix.
Light shown | What it means | What to do |
Green | Sensor is actually online; the app may not have refreshed yet | Wait a few minutes and refresh the app. If still showing offline, reboot your router. |
White (circling) | Connecting; the sensor is reaching out to the Minut server | Wait up to 2 minutes. Do not turn the sensor off during this. |
White then red | On Wi-Fi but cannot reach the Minut server | Reboot your router. Check other devices on the same network have internet access. |
No light | Sensor is off or battery is completely flat | Connect via USB-C for 10–15 minutes then try again. |
For the full LED reference, see LED indicator lights - M3 sensor.
Wifi troubleshooting
If the sensor has power but is not connecting, work through these steps in order.
Reboot the router
Turn the router off, wait 20 seconds, then plug it back in. Once it has fully restarted, press the front button on the sensor to check if it reconnects.
This resolves most offline sensor issues
Power cycle the sensor
Remove the sensor from its mounting plate. Hold the front button until the sensor turns off. Wait a few minutes, then press the button to turn it back on. Wait 30 seconds and press the front button to check the status light.
Check the sensor is within range of the router
Move the sensor closer to the router temporarily to test signal strength. If it reconnects when close, the mounting location may be too far. You can check the Wi-Fi signal strength rating in the app under the sensor’s detail view.
Weak Wi-Fi signal also increases battery drain
Confirm the network is 2.4 GHz
The M3 sensor supports 2.4 GHz Wi-Fi only; it does not work on 5 GHz networks. If your router broadcasts both frequencies under the same name, rename them so the sensor can connect to the correct band. Then update Wi-Fi settings.
Check other devices on the same network
If other devices also have no internet access, the issue is with your router or internet connection not the sensor. Contact your internet provider.
The M3 has no power switch. Unlike the M2, there is no physical on/off switch to check. If the sensor is unresponsive, the battery is most likely flat — charge via USB-C before doing anything else.
Update wifi settings
If your router’s Wi-Fi name or password has changed, the sensor will go offline because it can no longer authenticate with the network. Updating Wi-Fi settings restores the connection without deleting any data.
Open the Minut app:
Open the Minut app
Click on Properties in the bottom menu
Select the rental unit
Scroll down and under Devices, tap the Minut sensor you want to update Wifi settings for
Tap on the gear icon in the top right corner (This is important as there are many settings menus)
Tap on Advanced
Towards the bottom, you will find Update Wifi settings
Follow the instructions in the app
For full Wi-Fi requirements and additional troubleshooting, see Wi-Fi and connectivity.
Battery issues
A critically low battery will cause the M3 to go offline. If you received a low battery notification and the sensor subsequently dropped offline, charge it first via USB-C before attempting any other troubleshooting.
Full charge time: approximately 2–5 hours from empty via USB-C. The charging indicator lights on the back of the sensor blink while charging and turn solid when fully charged. Make sure the sensor is removed from the mounting plate to access the USB-C port.
For full battery information see M3 charging and battery information
If the sensor drains unusually fast, going from full to flat within a few days, this may indicate a hardware issue rather than normal battery consumption. Contact support with your serial number and a description of the drain pattern.
If nothing has worked
If the sensor is still offline after all the steps above, try a reinstall first, it does not delete any of your data. Move to a factory reset only if reinstalling does not resolve it.
Reinstall the sensor
Delete the sensor from the rental unit in the app, then go through the installation flow again. All rental unit settings and event history are preserved.
Factory reset the sensor
Only if reinstalling does not resolve the issue. A factory reset wipes the sensor completely, all stored Wi-Fi credentials and account associations are removed. Rental unit data in your account is not affected.
For full instructions on both, see Reinstalling and factory resetting the M3 sensor.
Contact Support
If you have worked through all the steps above without success, contact the Minut support team.
Email hello@minut.com with:
Your Minut account email address
The MAC address of the sensor
Make and model of your router
What colour the sensor shows when you press the front button
Which steps you have already tried from this article
Whether other devices on the same network have internet access