On my Homedics BPA-110 the "E3" means there was an "error obtaining measurement data: measure again". When you measure, make sure the cuff hose is centered on your arm. I have noticed the placement of the hose cuff is quite critical. If the hose on the cuff is not centered, you will probably get some type of "Exx" error code. This has happened several times with my monitor. Hopes this helps.
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On my Homedics BPA-110 the "E3" means there was an "error obtaining measurement data: measure again". When you measure, make sure the cuff hose is centered on your arm. I have noticed the placement of the hose cuff is quite critical. If the hose on the cuff is not centered, you will probably get some type of "Exx" error code. This has happened several times with my monitor. Hopes this helps.