Omron HeatTens HV-F311-E - Display and Operation Problems; Battery Indicator Issues

Troubleshooting
30
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The battery may be depleted. Recharge the battery fully.
Is the battery properly charged? Check if the AC Adapter is properly
connected to the unit.
Check if AC Adapter is connected to a
power outlet.
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The battery charge may be extremely
low.
Recharge the battery fully.
The cord with pads may be broken. Refer to the warranty conditions.
Are you using only 1 pad?
(pad icon) is displayed.
Put the other pad on your skin. You
must use both pads for therapy to work.
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The battery is empty or close to empty. Recharge the battery fully.