If it is new ask manufacturer for a replacement. or at least a larger cuff. THe cuff you are using maybe too big or too small for your arm for it to function correctly
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: Omron hem-704C blood pressure monitor show down
If your HEM 704C fell hard, it is probably the pressure transducer that is faulty, broken. To my experience it is cheaper to buy a new one then to have it repaired by a technician
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SOURCE: looking for replacement arm cuff for my sunbeam
To get a replacement arm cuff call sunbeam at 1-800-394-2326
The cuff will cost you 12.95 there. If you need you can get the manual and order sheat on the link below. Page 10 of manual.
http://www.foodsaver.com/manuals/HAH/Manuals/7652.pdf
Good Luck
Testimonial: "i messed up you fix me thanks very much"
SOURCE: The Sunbeam blood pressure kit doesn't inflate the cuff.
You have the same problem I do. The hose socket to the machine is broken.
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