A sensor error on the FreeStyle Libre 3 means your glucose readings are paused for the moment. The system has detected a condition where it cannot give a reliable result, so it holds back numbers rather than show one it does not trust. This guide explains the safe, practical steps, and it is general information, not medical advice.
Quick answer
Do not remove the sensor. A sensor error is usually temporary, so wait about ten minutes and keep your phone or reader close and still. Most sensor errors clear on their own. If you have symptoms or need to make a treatment decision, use a backup fingerstick meter, and if the error keeps returning, contact Abbott Customer Care and follow your healthcare provider guidance.
| Error snapshot | |
|---|---|
| Exact error code | Sensor Error |
| Error message | Sensor Error. Your glucose reading is not available. Check back in 10 minutes. |
| Applies to | Abbott FreeStyle Libre 3 sensor with the app or reader |
| Environment | Continuous glucose monitoring on phone or reader |
| Severity level | Medium readings paused, check glucose another way if needed |
| Quickest fix | Leave the sensor on, wait about ten minutes, and keep your phone or reader nearby. |
What the error actually means
In plain English
The sensor briefly cannot produce a trustworthy glucose value, so it shows a sensor error and pauses readings to keep you safe. In most cases it sorts itself out within a short wait.
The FreeStyle Libre 3 measures glucose continuously through a small filament under the skin. A sensor error appears when the system temporarily cannot get a valid signal. Common, harmless reasons include the sensor being too cold or too hot, pressure on the sensor, for example lying on it, or a brief signal interruption between the sensor and your phone or reader.
Because the device is making a safety decision, it withholds the number instead of guessing. That is the intended behaviour. The important thing is to give it a short window to recover and to have a backup way to check your glucose if you need a value right away.
Before you start
Prerequisites and warnings
- Do not remove or replace the sensor just because of a single sensor error, since it usually clears by itself.
- Keep a backup fingerstick glucose meter available, and use it if you feel unwell or need to act on a reading now.
- This article is general guidance only, and any decision about your glucose, insulin, or treatment should follow your healthcare provider instructions.
Step by step fixes
These are gentle, safe steps. Your health comes first, so check your glucose another way whenever you are unsure.
| # | Step |
|---|---|
| 1 | Wait about ten minutes. A sensor error is typically temporary. Leave the sensor in place and check the app or reader again after roughly ten minutes. |
| 2 | Keep your phone or reader close and still. Stay within range and avoid moving the device away. A brief signal gap between the sensor and the phone or reader can cause the error. |
| 3 | Relieve pressure on the sensor. If you were lying or pressing on the sensor, change position so nothing presses on it, which can interfere with readings. |
| 4 | Let the sensor reach normal temperature. If you came from a very hot or cold environment, give the sensor time to return to a normal skin temperature. |
| 5 | Make sure the app is updated and Bluetooth is on. Confirm the FreeStyle Libre app is up to date and Bluetooth is enabled so the sensor can connect properly. |
| 6 | Check glucose with a backup meter if needed. If you have symptoms or need a value before the error clears, use a fingerstick meter and act on that, following your care plan. |
| 7 | Note repeated errors and contact Abbott. If the error keeps returning or does not clear, note when it happens and contact Abbott Customer Care, who can advise on a replacement if the sensor is faulty. |
The technical context (the why)
Continuous glucose monitors are designed to fail safe. When the sensor cannot read a clean signal, whether from temperature, pressure, a momentary connection drop, or an internal check, it shows a sensor error and pauses the reading. Showing no number is safer than showing one that might be wrong, because people make real decisions from these values.
Most temporary sensor errors resolve once the cause passes, which is why a short wait is the standard first step. If a sensor produces errors repeatedly, it may be faulty or nearing the end of its wear, and Abbott can review it. Throughout, a backup fingerstick meter remains the reliable way to confirm your glucose when you need certainty.
Key points to remember
- A sensor error pauses readings on purpose, to keep you safe.
- It is usually temporary and clears within about ten minutes.
- Do not remove the sensor over a single error.
- Always keep a backup meter and follow your healthcare provider guidance.
Still broken? Your safety net
If a sensor error does not clear after waiting, or it returns again and again, the sensor may be faulty. Contact Abbott Customer Care to report it and ask about a replacement, and keep using a fingerstick meter in the meantime. For anything about how to manage your glucose, insulin, or symptoms, speak with your doctor or diabetes care team, who know your individual plan.
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TLDR
- A sensor error means readings are temporarily paused for safety.
- Leave the sensor on, wait about ten minutes, keep the device close.
- Relieve pressure and let the sensor reach normal temperature.
- Use a backup fingerstick meter if you need a reading now.
- Repeated errors warrant contacting Abbott, and follow your care team advice.
Written and maintained by: Freddy John, founder of Wings Infotech and editor at Seminarsonly. This guide is reviewed and updated as vendors ship new patches. Last reviewed: 26 June 2026.
