20 Most Recent Omron Healthcare Omron Hem-712c 712 Blood Pressure Monitor Free Ship Questions & Answers

Depends on where you are in the world, however it is quite likely that repair will not be economical given the cost of a new one, with a warranty as well. .

Unless you are the manufacturer, otherwise you are not able to adjust the measurement value

To delete all the records :

1. Press the MEMORY button
2. And while holding the MEMORY and the START/STOP button simultaneously for more than 2 seconds all records will be deleted.

To set date/time :

1. Press the Date/Time Setting button to adjust the date and time (the year flashes on the display)
2. Press the MEMORY button to advance by increaments of one year and press the Date/Time Setting button,
   
3. Press the MEMORY button to advance by increaments of one month and press the Date/Time Setting button,
4. Press the MEMORY button to set the current day and press the Date/Time Setting button,
5. Press the MEMORY button to set the current hour and press the Date/Time Setting button (the time is set using AM/PM)
6. And finally, press the MEMORY button to set the current minute and press the Date/Time Setting button.

I'm assuming you are using it the way its manual recommends - in the correct position on the arm, the band firmly attached - and that the batteries are new and the contacts clean.
In that case the error appears either because the bladder doesn't inflates or the detector is faulty - in either way it will cost you more to fix it than to buy a new unit.  But since this unit is destined to the scrapheap you can try to fix it yourself: open the casing and check that the pump works, that the air pipes leading to the band are in good order (no leaks), that the wires to the sensor on the band are continuous and that the sensor itself is still attached to the wires. If not then try to fix what is broken.