Omron HEM-9210T Instruction Manual page 25

4.2 Troubleshooting
If any of the below problems occur during measurement, check to make sure
that no other electrical device is within 12 inches (30cm). If the problem
persists, please refer to the table below.
No power.
No display appears on the monitor.
Measurement values appear too high
or too low.
Problem Cause and Solution
Replace all batteries with new ones.
Check the battery installation for
proper placement of the battery
polarities.
Refer to chapter 2.
Blood pressure varies constantly.
Many factors including stress, time of
day, and how you wrap the cuff, may
affect your blood pressure.
Review the section 1.3, 3.2 and 3.3.
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