Xiaomi’s smart thermometers are not just temperature-measuring gadgets, but full-fledged health-monitoring assistants. They integrate with the Mi Home ecosystem, sync with smartphones, and even send alerts at critical rates. However, many users face the problem that the thermometer they buy doesn’t turn on or respond to taps. The reasons can range from a dead battery to an application pairing error.
In this article, we will analyze all the current models of Xiaomi thermometers (including Mi Thermometer 2, Mi Smart Band 7/8 Pro with a temperature sensor and Xiaomi Mi Bunny Thermometer), explain how to turn them on, configure and fix typical problems. If your gadget is dead weight – do not rush to carry it into service: in 90% of cases, the problem is solved in 5 minutes.
What Xiaomi Thermometers Are and How to Distinguish Them
Xiaomi produces several types of thermometers, and the algorithm for turning them on may differ.
- 🔹 Mi Thermometer 2 (LYWSD02) — Classic Bluetooth-degree with display, works on a battery CR2032. Supports measurement of body temperature and environment.
- 🔹 Mi Smart Band 7/8 Pro fitness bracelets with built-in skin temperature sensors require constant synchronization with your smartphone.
- 🔹 Xiaomi Mi Bunny Thermometer (Viatom Checkme) - contactless infrared thermometer for forehead temperature. USB-C.
- 🔹 Aqara Temperature and Humidity Sensor, a smart home sensor that measures temperature and humidity. Not designed for medical purposes.
Before you try to turn on the device, check the model. Usually the name is indicated on the package or in the documentation. If there is no box, look at the back of the gadget: there should be a sticker with an article (for example, LYWSD02 for Mi Thermometer 2).
Important: Xiaomi thermometers are divided into medical (certified for measuring body temperature) and household (for indoor climate), using a household sensor for medical purposes can give an error of up to 1-2 ° C.
Preparation before inclusion: what to check first
If your Xiaomi thermometer is not showing signs of life, don't panic.
- Power. Make sure the battery (for models on the CR2032) not discharged or the battery charged (for USB-In Mi Thermometer 2, the display does not turn on at all when the battery is discharged.
- Power button. Some models (like the Mi Bunny) have a physical power button — press and hold it for 3-5 seconds.
- Application-based pairing: Xiaomi thermometers often require a connection to Mi Home or Zepp Life (for bracelets), without which they can operate in limited mode.
For models with batteries (Mi Thermometer 2, Aqara):
- 🔋 Check the polarity when installing the battery (plus should look upwards).
- 🔋 If the device does not respond, remove the battery for 10 seconds and insert it back in.
- 🔋 Use only new batteries. CR2032 (They are not fake!! cheap analogues may not give enough voltage.
☑️ Check before turning on the Xiaomi thermometer
⚠️ Warning: If you use the Mi Smart Band to measure temperature, make sure the bracelet has the latest firmware installed.Old software can block the sensor from working.
How to turn on Mi Thermometer 2 (LYWSD02) – step-by-step instructions
The Mi Thermometer 2 is the most popular model, but it's often questionable to include.
- Install the battery. Open the back cover (you'll need a coin or a flat screwdriver). Put the CR2032 battery upside down. Close the lid before you click.
- Activation. Once the battery is installed, the thermometer should automatically turn on: 🔄 Remove the battery for 15 seconds and insert it back in. 🔄 Press the small button on the side (if any) once.
Synchronization with Mi Home
Mi Home
+ → Add the device → Thermometer
If the thermometer is turned on but does not display the temperature:
- 📱 Reboot the Mi Home app.
- 📱 Make sure your smartphone has Bluetooth and geolocation enabled (required to find devices).
- 📱 Check if the thermometer has been added to another Mi Account (for example, if the gadget is used).
| Problem. | Possible cause | Decision |
|---|---|---|
| Not activated after the battery is installed | Battery discharged or incorrectly installed | Replace the battery, check for polarity |
| The display flashes and goes out. | Low battery charge | Install the new CR2032 battery |
| Not synchronized with Mi Home | The device is linked to another account | Reset the thermometer settings (hold the 10 sec button) |
| It's showing the wrong temperature. | Sensor contaminated or damaged | Wipe the sensor with alcohol, recalibrate in the settings |
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If the Mi Thermometer 2 doesn’t turn on even after you’ve replaced your battery, try waking it up by bringing it to the heat source (e.g. holding 1-2 minutes in your hand).
Infra-red thermometer Mi Bunny (Viatom Checkme)
Xiaomi Mi Bunny Thermometer (aka Viatom Checkme) is a contactless infrared thermometer that measures the temperature of the forehead. Unlike classical models, it has a battery and a battery. USB-Charging port. Here's how to turn it on correctly:
- Charge. Connect the thermometer to the charger (use a USB-C cable). Full charging takes ~2 hours. The charging indicator should burn red, and after completion, green.
- Turn on. Press and hold the power button (located on the back) for 3 seconds, and the sound will sound, and the Mi logo will appear on the display.
- Calibration: The thermometer may require calibration before first use. Follow the instructions on the screen (usually pointing at an object at a known temperature, such as a glass of room temperature water).
If the thermometer is not activated:
- 🔌 Check the charging: connect to another USB-port or charger.
- 🔌 Hold the power button for 10-15 seconds for forced reboot.
- 🔌 Update the firmware through the Mi Home app (Device Profile section) → Update of the PO).
⚠️ Attention: Xiaomi infrared thermometers are sensitive to lens contamination. If the readings are unstable, wipe the sensor with a soft napkin dipped in alcohol!
How to activate the temperature sensor in the Mi Smart Band 7/8 Pro
The Mi Smart Band 7/8 Pro fitness bracelets are equipped with a skin temperature sensor, but by default it can be turned off.
- Update your firmware. Make sure the bracelet has the latest version of the software installed. Open the Zepp Life app (formerly Mi Fit), go to Profile → Your device → Firmware Update.
- Turn on the sensor. In the same app, search Health → Skin Temperature and activate the option.
- Set up notifications. You can turn on fever alerts in the Notifications → Health Warnings section.
Important nuances:
- 📊 The temperature sensor in the bracelets measures the temperature of the skin, not the body.°C.
- 📊 For accurate data, wear the bracelet tightly attached to your wrist (but not too tightly!).
- 📊 Measurements are taken automatically every 5-10 minutes, but you can manually run them through the bracelet menu.
Why does the bracelet show a temperature lower than a mercury thermometer?
Frequent Mistakes and How to Avoid Them
Even after successfully turning on the Xiaomi thermometer, users are faced with typical problems, and here are the most common ones and ways to solve them:
- 🚫 The thermometer doesn't sync with Mi Home. Reasons: The device is tied to another account (reset needed). Bluetooth on the smartphone is disabled or unstable. An outdated version of the Mi Home app. Solution: Reboot your smartphone, update your Mi Home, try resetting your thermometer (hold the 10 sec button).
- 🚫 The readings are very different from the actual temperature. Causes: Sensor is contaminated or damaged. Thermometer is not calibrated (relevant to Mi Bunny); External factors (draught, direct sunlight). Solution: Wipe the sensor, recalibrate the device, measure the temperature in stable conditions.
- 🚫 Fast battery discharge. Reasons: Used non-original batteries CR2032. The thermometer is in the bad Bluetooth signal zone (constantly trying to connect).Solution: Buy quality batteries (like Duracell or Energizer), disable unnecessary notifications in Mi Home.
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If the Xiaomi thermometer shows a knowingly incorrect value (for example, 30 ° C at room temperature), the sensor is likely damaged, in which case the gadget must be replaced under warranty.
Resetting settings and flashing thermometer
If the Xiaomi thermometer is not working properly (e.g., permanently shutting down or not synchronizing), you may need to reset to factory settings or flash it over.
For Mi Thermometer 2 (LYWSD02):
- Remove the battery for 30 seconds.
- Insert the battery back and immediately press and hold the button sideways for 10 seconds.
- After resetting, the thermometer will flash - now it can be reconnected to the Mi Home.
For Mi Bunny (Viatom Checkme):
- Connect the thermometer to the charger.
- Press and hold the power button for 15 seconds until the double signal sounds.
- Turn off the charger and turn it back on.
If the reset does not help, try reflashing the device:
- Open Mi Home and go to the thermometer profile.
- Click Settings → Update the firmware.
- If the update is not available, check if it is blocked for your region (sometimes changing the region in your Mi Account settings helps).
⚠️ Warning: Don't interrupt the firmware update process! If the thermometer goes off during firmware, it can turn into a brick. Charge the device to 100% before upgrading.