SOURCE: WITH AUTOMATIC CUFF BLOOD PRESSURE MONITOR GETTING ERROR
E might represents insufficient inflation for your mom. For automatic inflation monitors usually there is a mechanism to keep inflating the cuff to higher pressures for people with higher BP. Check how is done. In some auto monitors,while cuff is inflated you keep pressing on START button until pressure reaches to some 15 to 20 mmHg higher than the pressure that auto usually stops and displays E.
SOURCE: mabis automaic blood pressure cuff, pressure monitor
Dear Edward: Likely, either cuff not tight enough or not in correct location on your arm or not holding device at correct height. Make sure you use Lithium Ion batteries. Try it on someone else. Dr Ron Grassi,Jupiter,Florida.USA. www.DrGrassi.com 
SOURCE: My blood pressure monitor is
Contact the HoMedic's Consumer Relations Dept @ 800-466-3342 Mon - Fri, 8:30am - 5:00pm ET, they can help you.
Keep in mind, that improper placement of the wrist cuff can cause higher or lower readings, than what they truly are. Also, not keeping your arm at heart level can cause an inaccurate reading.
SOURCE: Lumiscope Model 1157 Deluxe Digital
In all most all cases, the manufacturer has to do the recalibration. This is because it has to be certified as correct. Contact the manufacturer for instructions on how to return it. Most charge little or nothing for this service.
SOURCE: My Omron blood pressure monitor does not give me a
BEFORE TAKING THE READING DONT USE IT BEFORE COMING UP FROM STEPS OR SUDDENLY WALKING AND TAKING READING
IF YOU TAKE READING IT WILL COME HAZARDIOUS
SIMPLY RELAX FOR 10 MINUTES AND STAY CALM WITHOUT TALKING
AND FOLLOW AS PER MANUALS TO TAKE READING
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