Home blood pressure monitoring (BPM) allows people to track their cardiovascular health easily. These automated devices use oscillometry to detect pressure pulses in the artery and calculate a reading. While this technology simplifies measurement, it occasionally displays error codes when it cannot obtain a reliable result. The common E2 error signals that the device encountered interference, preventing an accurate measurement.
The Meaning of the E2 Error Code
The E2 error code signifies a “Measurement Error Due to Motion” or an “Artifact Error.” This indicates the monitor detected too much variation or interference in the pressure signals during the inflation and deflation cycle. The internal algorithm relies on consistent pressure fluctuations to determine systolic and diastolic values, and it aborts the measurement when the data is compromised. Displaying the E2 code warns that the attempted reading is unreliable and should be disregarded.
Identifying the Source of the Error
This artifact error occurs because the monitor’s sensitive sensors pick up movements that distort the pressure wave being measured. Talking or laughing is a frequent cause, as these actions create muscle tension that interferes with the blood flow signal. Moving the arm, hand, or shifting posture while the cuff is inflating or deflating will also generate enough noise to trigger the E2 code. Stillness is a fundamental requirement because the oscillometric method is highly susceptible to movement.
The error can also stem from issues related to the cuff, which acts as the primary sensor. If the cuff is applied too loosely, the monitor may struggle to detect pressure pulses, or if it is excessively tight, it could impede blood flow. Taking a reading over thick, bundled clothing will dampen the pressure waves and prevent the monitor from sensing the subtle arterial oscillations it needs to calculate a result. A loose connection in the air hose or a low battery level can also contribute to the measurement failure interpreted as an E2 error.
Immediate Steps to Resolve E2
The most effective step to resolve the E2 error is ensuring complete stillness and a proper pre-measurement rest period. The American Heart Association recommends resting quietly for three to five minutes before attempting to re-test. During this time, sit with your back fully supported by a chair, your feet flat on the floor, and your legs uncrossed.
When ready to take the reading, verify the cuff is placed directly on your bare arm, avoiding restrictive clothing. The cuff should be snug enough that you can comfortably slip two fingertips between the material and your skin. Position your arm so the cuff is at the level of your heart, often achieved by resting your forearm on a table.
Once the inflation process begins, remain completely silent and motionless until the reading is finalized and the cuff has fully deflated. Avoid any conversation, chewing, or flexing of the arm muscles during the measurement cycle. If the E2 error persists despite perfect technique, inspect the air hose for kinks or leaks, and ensure the hose connection to the monitor is secure. If the problem continues after multiple attempts, the issue may be a hardware malfunction, requiring professional advice or monitor replacement.