CareSens N Meter Error Codes: A Comprehensive Guide
Table of Contents
CareSens N Meter Error Codes are diagnostic alerts displayed by your device when a test cannot be completed accurately. Common codes like Er1 (Used Strip) or Er4 (Sample Error) act as essential safeguards to ensure the reliability of your glucose readings. For a broader look at compatible supplies and comparisons, read our complete guide to CareSens Test Strips.
In this guide, we break down every error code, explain what it means, and provide the solution. We have also added Error 8 (Er8), which frequently appears on newer models like the CareSens Dual.
⚠️ Troubleshooting Alert: Most Errors = Bad Strip
Updated February 2026: Confirmed solutions for Er1–Er5.
Data shows that 90% of error codes (specifically Er1, Er2, Er4, and Er5) are caused by a compromised, used, or bent test strip. The only reliable fix is to discard the damaged strip immediately and retest with a fresh one.
🩸 Shop Fresh CareSens N Test Strips (50 Count) →
Quick Chart: CareSens N Meter Error Codes
| Code | Meaning | Solution | Action |
|---|---|---|---|
| Er1 | Used Test Strip Or strip is damp/expired. | Discard. Retest with new strip. | Shop 50 Strips → |
| Er2 | Blood Applied Early Before the "Drop" symbol. | Discard. Wait for symbol. | Shop 50 Strips → |
| Er3 | Temp Out of Range | Move to 50°F – 104°F area. | -- |
| Er4 | Sample Error Blood drop too small/thick. | Discard. Retest with larger drop. | Shop 50 Strips → |
| Er5 | Wrong Test Strip Non-CareSens N strip used. | Use only CareSens N strips. | Verify Correct Strip → |
| Er6 | Meter Failure | Call Support: 1-800-429-5001. | -- |
| Er8 | Strip/Signal Error Strip moved during test. | Discard. Do not touch strip during test. | Shop 50 Strips → |
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Since most errors require a fresh test strip, keeping a healthy stock is the best way to avoid interruption. Buying in bulk unlocks Free Shipping and lowers your price per box significantly.
| Pack Size | Total Price | Price Per Box | Action |
|---|---|---|---|
| Single Box (50 Strips) | $9.99 (+ $4.99 Shipping) | $9.99 | Shop Single Box → |
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Detailed Breakdown: CareSens N Meter Error Codes
Unlike complex meters, the CareSens N system uses a limited set of codes (Er1–Er8) to diagnose problems. Here is the detailed meaning of each.
Error Code 1 (Er1) - Used Test Strip
Meaning: The meter detected blood or control solution on the strip before the test officially began. This often happens if you reuse an old strip or if the strip was exposed to moisture (left out of the vial).
Solution: Remove the used strip and replace it with a new one. Shop CareSens N Test Strips here.
Error Code 2 (Er2) - Strip Inserted Too Early
Meaning: The blood or control solution sample was applied before the "Insert Strip" symbol appeared on the screen.
Solution: Remove the strip and discard it. Insert a new strip and wait until the flashing symbol appears before applying your sample.
Error Code 3 (Er3) - Temperature Out of Range
Meaning: The ambient temperature is either too hot or too cold for the meter to function accurately.
Solution: Move to an area where the temperature is within the operating range (50 - 104˚F). Wait 10–15 minutes for the meter and strips to adjust to the new temperature before testing.
Error Code 4 (Er4) - Blood Sample Issue
Meaning: The blood sample has abnormally high viscosity or, more commonly, insufficient volume (the blood drop was too small).
Solution: Do not try to add more blood to the same strip. Repeat the test using a new test strip and ensure a large, round blood drop is applied.
Error Code 5 (Er5) - Wrong Test Strip
Meaning: The meter does not recognize the strip. This usually means you are using a strip from a different brand or a different CareSens model (like CareSens PRO).
Solution: Ensure you are using CareSens N Test Strips. Insert the strip with the contact bars facing up and push in gently until the meter turns on.
Error Code 6 (Er6) - Hardware Problem
Meaning: There is an internal electronic failure with the meter.
Solution: Do not use the meter. Contact Customer Service: 1-800-429-5001.
Error Code 8 (Er8) - Electronic Signal Error
Meaning: Commonly seen on the CareSens Dual or Premier models, this indicates the strip was removed during the test or there was a communication error.
Solution: Retest with a new strip and ensure you do not touch or wiggle the strip while the meter is counting down.
CareSens N Meter Error Codes: General Troubleshooting Tips
The display is blank even after inserting a test strip
- Check whether the test strip is inserted with the contact bars facing up.
- Check if the strip has been inserted completely into the test strip port.
- Check if the batteries are inserted correctly or need replacing.
The test does not start even after applying blood
- Check if the confirmation window on the strip is filled completely.
- Repeat the test after inserting a new test strip.
How to Avoid Errors
- Use Fresh Strips: 90% of issues are caused by expired or damaged strips. Buy fresh strips here.
- Store Properly: Keep test strips in their original vial with the cap closed tightly. Exposure to humidity causes Er1 errors.
- Wash Hands: Residue on your fingers can affect the blood sample and cause Er4 errors.
Contacting CareSens Customer Service
If you have persistent issues, contact CareSens Customer Service at 1-800-429-5001. Have your meter model number and the expiration date of your test strips ready when you call.
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Frequently Asked Questions
How do I reset my CareSens N meter?
If your meter is acting strangely or showing Er6, you can perform a "hard reset" by removing the batteries for at least 30 seconds. Reinsert them (or replace them with fresh coin cell batteries) to reset the internal system. If errors persist, contact support.
What does Er4 mean on a CareSens meter?
Er4 indicates that the blood sample was too small or too thick (high viscosity) to generate a reading. Do not attempt to add more blood to the same strip, as this will result in an inaccurate reading. You must discard the strip and start over with a fresh one and a larger blood drop.
Can I reuse a CareSens N test strip if I get an error?
No. Once blood or control solution touches a test strip, the chemical enzymes are activated. You cannot reuse a strip, even if the meter gave an error code like Er2 or Er4. Attempting to reuse a strip will trigger Er1 (Used Strip).
Why do I keep getting Er1 errors with new strips?
If you are seeing Er1 on unused strips, your vial may have been left open, allowing humidity to damage the remaining strips. Test strips are sensitive to moisture. If a vial has been open for a long time or the cap wasn't sealed tight, the entire batch may be compromised. We recommend replacing the box immediately.
Do CareSens N strips work with the CareSens N Premier or Dual?
Yes. CareSens N Test Strips are compatible with the CareSens N, CareSens N Plus, CareSens N Voice, CareSens N Premier, and CareSens Dual meters. They are not compatible with the older CareSens II or the CareSens PRO systems.
