The E5 error on an Omron blood pressure monitor typically means that clothing is interfering with the arm cuff.
🔧 Common Meaning of “E5” Error on Omron Controllers
For most Omron temperature controllers:
❗ E5 = Sensor input error
→ The controller cannot detect a proper signal from the temperature sensor (thermocouple or RTD).
✅ Steps to Fix the E5 Error
1. Check the Sensor Wiring
Power off the controller.
Inspect wiring for:
Loose connections
Corrosion
Broken wires
Crossed polarity (especially for thermocouples)
Make sure the sensor is connected to the correct terminals.
2. Verify Sensor Type Matches Configuration
Ensure the sensor type (e.g., K-type thermocouple, Pt100 RTD) matches the settings in the controller.
Omron controllers must be told what type of input they’re receiving:
Access controller menu: [Setup Mode] → [Input Type] or similar
Compare the setting (e.g., “K”, “Pt”, etc.) to the actual sensor
3. Test the Sensor
Use a multimeter to check:
Resistance of RTDs (e.g., Pt100 should be ~100 ohms at 0°C)
Continuity and voltage on thermocouples
Swap with a known-good sensor to rule out damage.
4. Reset the Controller
Power-cycle the controller after checking/fixing wiring or settings.
Some models allow a manual reset by holding a front panel button (check your manual).
5. Check for Physical Damage
Look for signs of internal component failure: burnt smell, overheating, or cracked display.
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🛠️ Model-Specific Tips
📘 Omron E5CN/E5CSV/E5CS
Press and hold the Mode or Level button (depending on model) to enter configuration mode.
Scroll to
InporTYPEand confirm it’s correct (e.g., “K” for K-type thermocouple).After changes, exit and reboot the controller.
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Other possible causes for the E5 error:
- Incorrect cuff size: If the cuff is too small or too large, it may not be able to detect your pulse properly.
- Movement during measurement: Try to remain still and quiet while the measurement is being taken.
- Irregular heartbeat: In some cases, an irregular heartbeat can interfere with the measurement. If you have concerns about your heart health, consult with your doctor.
- Low batteries: Although less likely with an E5 error, ensure your device has fresh batteries.
If you continue to experience the E5 error after trying these troubleshooting steps, it may be helpful to consult the user manual for your specific Omron blood pressure monitor model or contact Omron customer support for assistance.
