Xiaomi Smart Band 9 Not Tracking Heart Rate Properly [How to Fix?]
Heart rate tracking on the Xiaomi Smart Band 9 relies on optical sensors that detect blood flow through the skin. These sensors need proper skin contact, correct software instructions, and uninterrupted data syncing with the Mi Fitness or Zepp Life app. When any of these elements fail, the band may show inaccurate or missing heart rate readings.
In this detailed guide, you will learn why the Xiaomi Smart Band 9 may fail to track heart rate accurately and how to fix it step by step.
How to Fix Xiaomi Smart Band 9 Not Tracking Heart Rate Properly?
If your Xiaomi Smart Band 9 is not tracking heart rate properly, the issue is usually caused by incorrect band positioning, disabled heart rate monitoring settings, outdated firmware, sensor blockage, or app sync problems. Fixing the problem involves wearing the band correctly, enabling continuous heart rate monitoring, cleaning the sensor, updating firmware, recalibrating the band, and ensuring proper app permissions. Following these steps can restore accurate heart rate tracking in most cases.
Below are detailed steps to diagnose and fix the issue systematically. Follow them for the best results.
Step 1: Wear the Xiaomi Smart Band 9 Correctly
One of the most common reasons for heart rate tracking issues is incorrect wearing style. The Xiaomi Smart Band 9 must sit properly on your wrist for the sensors to work accurately.
The band should be worn about one finger width above your wrist bone. It should fit snugly but not too tight. If the band is too loose, light enters the sensor area and interferes with readings. If it is too tight, blood circulation may be restricted, also affecting accuracy.
Make sure the sensor area on the back of the band is in full contact with your skin. Avoid wearing the band over tattoos, scars, or areas with thick hair because optical sensors struggle in these conditions. If possible, try wearing the band on the other wrist and check if heart rate tracking improves.
Step 2: Enable Heart Rate Monitoring in Settings
Sometimes the heart rate sensor is working fine, but the monitoring feature is turned off or limited by settings.
Open the Mi Fitness or Zepp Life app on your smartphone and connect your Xiaomi Smart Band 9. Go to device settings and locate the heart rate monitoring section. Ensure that heart rate tracking is enabled.
If you want continuous tracking, select automatic or all-day monitoring instead of manual mode. Also, check the monitoring frequency. A longer interval may make it seem like the band is not tracking heart rate, while it is actually measuring less often.
After enabling the correct settings, wait a few minutes and check the band display or app to confirm that heart rate data is being recorded.
Step 3: Clean the Heart Rate Sensor and Your Skin
Dirt, sweat, oil, or residue on the sensor can block the optical signal and cause inaccurate readings.
Remove the Xiaomi Smart Band 9 from your wrist and gently clean the sensor area on the back using a soft, dry cloth. If needed, slightly dampen the cloth with clean water. Avoid using alcohol, soap, or chemical cleaners, as these may damage the sensor coating.
Also, clean your wrist, especially if you have been sweating or using lotions. Dry your skin completely before wearing the band again. Once cleaned, put the band back on correctly and check if heart rate tracking improves.
Step 4: Restart the Xiaomi Smart Band 9
Temporary software glitches can interfere with sensor performance. Restarting the band often resolves these minor issues.
To restart the Xiaomi Smart Band 9, open the settings menu on the band itself. Scroll until you find the restart or reboot option and confirm it. If your band does not show a restart option, you can power it off and turn it back on if supported.
After restarting, wait for the band to reconnect with the app. Check the heart rate section to see if new readings appear.
Step 5: Update Firmware and App
Outdated firmware or app versions can cause compatibility issues and sensor bugs.
Open the Mi Fitness or Zepp Life app and check for firmware updates for your Xiaomi Smart Band 9. If an update is available, install it and keep the band close to your phone during the process. Make sure your phone has sufficient battery and a stable internet connection.
Also, update the companion app from the Google Play Store or Apple App Store. App updates often include bug fixes and performance improvements that directly affect heart rate tracking.
Step 6: Check App Permissions on Your Phone
If the app does not have the necessary permissions, it may fail to read or display heart rate data correctly.
Go to your phone settings and open the app permissions section for Mi Fitness or Zepp Life. Ensure that permissions such as Bluetooth, background activity, battery usage, and notifications are allowed.
Disable battery optimization or power saving restrictions for the app. These restrictions can stop the app from syncing heart rate data in real time, making it appear as if the band is not tracking properly.
Step 7: Re-sync the Xiaomi Smart Band 9 with the App
Sync errors between the band and the app can result in missing or outdated heart rate data.
Open the app and manually refresh or sync the device. Keep the band close to your phone and ensure Bluetooth is turned on. Wait until the sync process completes fully.
If syncing fails repeatedly, turn Bluetooth off and on again, then retry syncing. In many cases, this restores proper data transfer.
Step 8: Unpair and Pair the Band Again
If syncing issues persist, re-pairing the band can reset the connection and fix deeper software conflicts.
First, back up your data if the app provides an option. Then unpair the Xiaomi Smart Band 9 from the app and from your phone’s Bluetooth settings. Restart both your phone and the band.
After restarting, open the app and pair the band again as a new device. Follow the on-screen instructions carefully. Once paired, re-enable heart rate monitoring and check if readings are accurate.
Step 9: Check Workout Mode Settings
Heart rate tracking behaves differently during workouts compared to normal daily monitoring.
If the band fails to track heart rate during exercise, ensure you have started a workout mode manually. Some workout modes activate continuous heart rate monitoring automatically, while others require proper sensor contact and movement patterns.
Make sure the band is snug during workouts, especially for activities like running or cycling. Excessive movement can loosen the band and affect sensor accuracy.
Step 10: Allow Time for Sensor Calibration
New devices or recently reset bands may require some time to calibrate heart rate tracking.
Wear the Xiaomi Smart Band 9 continuously for at least 24 hours with heart rate monitoring enabled. This allows the device to adapt to your skin and usage patterns.
During this period, avoid frequently removing the band and ensure it remains properly positioned. Over time, readings usually become more consistent.
Step 11: Rule Out Environmental Factors
External conditions can influence heart rate sensor accuracy.
Cold weather reduces blood flow near the skin surface, making it harder for optical sensors to detect heart rate. Warm up your wrist before checking readings.
Very dark tattoos or thick body hair can also interfere with the sensor. If possible, test the band on a different wrist or slightly reposition it to find a clearer area of skin.
Step 12: Reset the Xiaomi Smart Band 9 to Factory Settings
If none of the previous steps work, a factory reset may be necessary.
Open the band settings and select factory reset. Confirm the action. This will erase all data stored on the band, so ensure your data is synced or backed up if possible.
After resetting, pair the band with your phone again, update the firmware, and enable heart rate monitoring. Test the sensor to see if the issue is resolved.
Step 13: Check for Hardware Issues
If heart rate tracking still does not work after all troubleshooting steps, the problem may be hardware-related.
Inspect the sensor area for cracks, scratches, or discoloration. If the band has been exposed to water beyond its rating or has suffered physical damage, the sensor may be faulty.
In this case, contact Xiaomi customer support or visit an authorized service center. If the band is under warranty, you may be eligible for repair or replacement.
FAQs
Why is my Xiaomi Smart Band 9 showing inaccurate heart rate readings?
Inaccurate readings are usually caused by loose-fitting, dirty sensors, disabled monitoring settings, or environmental factors like cold weather or tattoos. Correct positioning and proper settings usually fix the issue.
Does the Xiaomi Smart Band 9 track heart rate continuously?
Yes, it can track heart rate continuously if automatic monitoring is enabled in the app. You can adjust monitoring frequency based on battery usage preferences.
Can software updates improve heart rate tracking accuracy?
Yes, firmware and app updates often include sensor optimizations and bug fixes that improve heart rate accuracy and stability.
Is it normal for heart rate tracking to stop occasionally?
Occasional gaps can occur due to movement, loose contact, or temporary syncing issues. Frequent or constant failures indicate a settings or hardware problem.
What should I do if heart rate tracking works only during workouts?
Check all day monitoring settings and ensure the band fits snugly during normal wear. Also, review app permissions and battery optimization settings.
Can tattoos affect Xiaomi Smart Band 9 heart rate tracking?
Yes, dark or dense tattoos can interfere with optical sensors. Wearing the band on a non-tattooed area usually improves accuracy.
Ending Up……
When your Xiaomi Smart Band 9 is not tracking heart rate properly, it can feel like the device has failed its most important function. Fortunately, most heart rate issues are easy to fix with the right approach. From wearing the band correctly and cleaning the sensor to updating firmware and adjusting app settings, each step plays a crucial role in restoring accurate tracking.
By following this complete guide, you can identify the root cause of the problem and apply the right solution without unnecessary frustration. If all software fixes fail, checking for hardware damage and contacting Xiaomi support is the final step.