Omron M1 Plus Instruction Manual page 28

5.Handling Errors and Problems
Error Display
Note: The irregular heartbeat symbol may also be displayed with error messages.
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Cause
Device error.
Pressure is too low.
Remedy
Contact your OMRON retail outlet
or distributor.
Refer to Chapter 8.
Press the inflation bulb to inflate
the arm cuff until the reinflation
symbol goes out. Or, deflate the
arm cuff and repeat measurement
after checking that the heartbeat
symbol has been displayed.
Refer to section 3.3.