E5
Omron Blood Pressure Monitor
Severity: MinorWhat Does This Error Mean?
E5 means the cuff pressure went above the maximum safe level (usually 299 mmHg) before the monitor could complete the reading. This is almost always caused by a cuff that is too small or applied incorrectly.
Affected Models
- Omron M2
- Omron M3
- Omron M6
- Omron HEM-7120
- Omron HEM-7156
Common Causes
- Cuff too small for the arm circumference
- Cuff applied too loosely — monitor keeps pumping to compensate
- Movement causing false pressure spike
- Kinked or blocked air tube
- Internal cuff pump fault (rare)
How to Fix It
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Check your arm circumference and use the correct cuff size.
Omron cuffs come in Small (17–22 cm), Medium (22–32 cm), and Large (32–42 cm). Using a small cuff on a large arm is the most common cause of E5.
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Ensure the cuff is applied snugly — not loosely.
A loose cuff causes the pump to over-inflate trying to get a seal. You should only be able to slip two fingers under the cuff.
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Check the tube for kinks.
Bend or blockage in the tube traps air and causes pressure to spike.
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Sit still and try again.
Movement during inflation can trigger E5 on some models.
Frequently Asked Questions
Could E5 mean my blood pressure is dangerously high?
Unlikely — E5 is a device error, not a blood pressure reading. It means the cuff over-inflated, not that your BP is above 299 mmHg. Fix the cuff issue and re-measure.