!
error Omron
Error Code Er
The monitor has malfunctioned.
? What Causes This
Internal monitor malfunction or error.
✓ How to Fix It
- Press the START/STOP button again.
- If Er still appears, contact customer service at 1-800-634-4350.
Source: page 37 of the official manual
From the manual
This error code appears in:
Omron BP7250 Blood Pressure Monitor