!
error Omron
Error Code Blinks or appears continuously
Indicates low battery.
? What Causes This
Battery power is exhausted.
✓ How to Fix It
- Replace all four “AAA” batteries with new ones.
- Ensure the correct polarity is used.
Source: page 23 of the official manual
From the manual
This error code appears in:
Omron M2 Basic Automatic Upper Arm Blood Pressure Monitor