Question edited to add full 'make model (what it is)'.
Question moved from Larry's computer category to Omron HEM-650.
First off Anonymous, we are FIXYA do com, we are not Omron. We are not who you think we are! Not all 'Simple Questions' get answered, purely because a Fixya Expert doesn't see them. This site is open 24 hours, and the experts working for free are only here 8 to 10 hours a day. We get 12 million views a year and 4 million questions! I have answered nearly 42,000 of them.
The manual on Page 31 and 32 tells you what the errors are. If you get 2 x E, it tells you to claim on the Warranty.
https://www.omronhealthcare.ca/wp-content/uploads/hem-650-instruction-manual.pdf
for warranty, you have to PHONE them, not post to a random, non-relevant website.
https://www.omronhealthcare.ca/service-and-support/warranty-repair-information/
Hope that helps. :>D