This article explains the difference between updating Wi‑Fi, reinstalling and factory resetting your Minut M3 sensor, when each one is needed, and how to do them. If you want to replace a sensor with another one on the same unit, use Sensor Swap instead: the new sensor keeps the same unit, settings and historical data.
Which option do you need?
Wi‑Fi changed: your router name or password has changed, or you want to use a different network. → Update Wi‑Fi without reinstalling (below).
Moving to a different unit: you are moving this sensor to another unit in your account or to a different organization. → Reinstall the sensor.
Persistent issues: the sensor is offline, won't connect or behaves unexpectedly after other troubleshooting. → Reinstall the sensor.
Used or second-hand sensor: the sensor was installed on another account and needs to be cleared. → Factory reset the sensor.
Decommissioning: you are permanently removing the sensor from service. → Factory reset the sensor.
Low battery or faulty sensor: you want to replace the sensor with a charged or working one on the same unit, without losing settings or data. → Use Sensor Swap.
A factory reset can be done without the Minut app; a reinstall can't.
Update Wi‑Fi without reinstalling
If only your Wi‑Fi name or password has changed, you don't need to reinstall or factory reset the sensor. Updating the Wi‑Fi settings keeps all your data and settings.
Open the sensor in the app. Tap Properties → select the unit → tap the sensor to open its detail view.
Open Advanced settings. Tap the settings icon (⚙) → Advanced → Update Wi‑Fi Settings.
Put the sensor into setup mode. Press and hold the button on the bottom of the Minut M3 sensor until it glows purple.
Select the new Wi‑Fi network. Follow the same Wi‑Fi flow as during installation. Select your 2.4 GHz network and enter the password.
No data is lost: all settings and history are kept.
Reinstall the sensor
To reinstall a Minut M2 or M3 sensor, delete it from its unit in the app, factory reset it, then install it again. You can reinstall it in the same unit or in a different one. A factory reset deletes the sensor's history and unlinks it from its unit.
💡 Replacing a sensor on the same unit? Use Sensor Swap instead. The new sensor takes over on the same unit with all its settings and historical data, without a reinstall.
Delete the sensor from the unit. Tap Properties → select the unit → tap the sensor → tap the settings icon (⚙) → scroll to Delete sensor → confirm. The sensor is removed from the unit; the unit stays in your account.
Factory reset the sensor. Follow steps 2–5 under Factory reset the sensor below: hold the button on the bottom of the sensor until it says "Factory reset" and the light turns red. The factory reset deletes the sensor's history and unlinks it from its unit.
Put the sensor into setup mode. Press and hold the button on the bottom of the sensor until it glows purple. Purple means the sensor is ready to install.
Install the sensor in the app. Open the unit you want to install it in → tap the + icon in the Devices section → follow the installation flow. See Installing the M3 sensor.
💡 Sensor won't enter setup mode? Make sure it has enough battery. Charge it via USB‑C for a few minutes and try again. If it still doesn't respond, factory reset it.
Factory reset the sensor
A factory reset wipes the sensor completely and removes all stored settings, Wi‑Fi credentials and account links. Use it as step 2 of a reinstall, when you've received a used sensor that is still linked to another account, or when you're decommissioning a sensor.
⚠️ A factory reset cannot be undone. All data stored on the sensor is permanently erased. A factory reset also deletes the sensor's history and unlinks the sensor from its unit.
Delete the sensor from the unit. Tap Properties → select the unit → tap the sensor → tap the settings icon (⚙) → scroll to Delete sensor → confirm.
Remove the sensor from its mounting plate. Take it off the wall or ceiling so you can reach the button on the bottom.
Press and hold the button on the bottom of the sensor. After about 15 seconds the sensor says "Factory reset in 3… 2… 1…". Keep holding — don't let go when you hear the countdown.
Hold until the light turns red, then release. When the sensor says "Factory reset" and the light turns red, release the button. Red means the reset worked.
Wait for the sensor to restart. It powers down briefly and restarts, wiped clean and ready to install as a new device.
💡 The Minut M3 sensor speaks during the reset. You'll hear a countdown from 3 and "Factory reset". If you hear nothing, the volume may be turned down or the battery may be too low. Charge the sensor and try again.
The sensor is now in the same state as a new one. Install it in a unit using the normal installation flow; see Installing the M3 sensor.
💡 Received a sensor that was linked to someone else's account? Factory reset it before installing. If it was never deleted from their account, you may not be able to install it until they delete it on their side. Contact hello@minut.com if you can't install a reset sensor.