More Info; Troubleshooting - oticon Opn Instructions For Use Manual

Troubleshooting

Symptom
No sound
Intermittent or
reduced sound
Squealing noise
Beeping/LED
flashing (optional)
Pairing issue with
Apple device
60 About Start-up Handling Options Tinnitus Warnings
Possible causes
Dead battery
Clogged earpieces (dome, Grip Tip, mould or Micro mould)
Hearing aid microphone muted
Clogged sound outlet
Moisture
Hearing aid earpiece inserted incorrectly
Earwax accumulated in ear canal
Ear has grown
If your hearing aid plays 8 beeps, 4 times consecutively, and/or
repeatedly flashes red 4 times with small pauses, your hearing aid
needs a microphone service check
Bluetooth connection failed
Only one hearing aid paired

More info