Blood Glucose Meter Giving Error Readings — What to Do

Hello. If your blood glucose meter is showing an error code instead of a reading, don't panic. Most errors are easy to fix once you know what they mean. Error: E-1 or "Err" — Test strip problem. This is the most common error. It usually means the strip was inserted incorrectly, the strip is expired, or the blood sample was applied before the meter was ready. Remove the strip, insert a new one, and wait for the meter to signal it's ready before applying blood. Error: E-2 or temperature symbol — Out of range temperature. Your meter only works correctly between about 50 and 104 degrees Fahrenheit. If you've left it in a cold car or a hot room, bring it to room temperature and wait 15 minutes before testing. Error: E-3 or battery symbol — Low battery. Replace the battery. Use only the battery type specified in your manual — typically a lithium coin cell or a standard AAA. Error: E-5 or blood drop with arrow — Insufficient blood sample. You didn't apply enough blood to the strip. Lance a new site, squeeze gently from the base of the finger, and apply blood to the side of the test strip. Consistently inaccurate readings: If your meter reads significantly higher or lower than how you feel, run a control solution test. Control solution comes with your meter kit. If the control reading falls outside the range printed on the test strip vial, the strips may be bad — replace the entire vial. Test strip storage matters. Always store strips in their original container with the lid tightly closed. Exposure to air, heat, or humidity degrades the strips. If your meter is malfunctioning or no longer covered, your DME provider can help you get a replacement, often at no cost with Medicare coverage. Find diabetic supply providers near you using the button below.