No sound or very weak sound

No sound is the most common complaint at follow-up appointments and is almost always caused by one of a small number of easily corrected issues. Work through this checklist systematically before assuming a device fault:

• Battery check: Test battery voltage with a battery tester. Zinc-air batteries can show adequate voltage on a tester but fail under load — replace with a fresh battery and retest. For rechargeable devices, verify the device charged fully and the charging contacts are clean.
• Wax guard / cerumen filter: A blocked wax guard is the single most common cause of no sound or reduced output in RIC and ITE devices. Replace the wax guard and retest. Keep replacement wax guards in stock for all devices you fit.
• Receiver tube / dome: Check for moisture, cerumen, or debris in the receiver tube or dome. Clean or replace as needed. In BTE devices, check the earmold tubing for moisture or blockage.
• Program selection: Verify the device is in the correct program. Some patients inadvertently switch to a mute or telecoil program.
• Volume control: If the device has a volume control, verify it has not been turned down.
• Fitting software check: Connect to fitting software and verify the device is programmed correctly. Check that gain has not been inadvertently set to zero in any channel.
• Electroacoustic analysis: If the above steps do not resolve the issue, perform electroacoustic analysis in a 2cc coupler to verify the device is producing expected output. Compare to manufacturer specifications.

Acoustic feedback (whistling)

Acoustic feedback occurs when amplified sound leaks from the ear canal and is re-amplified by the hearing aid microphone. It is one of the most disruptive complaints and a common reason for hearing aid rejection. Systematic troubleshooting:

• Fit check: Verify the earmold, dome, or custom shell is properly seated in the ear canal. A loose fit is the most common cause of feedback. Try a larger dome size or a closed dome if the patient is using an open dome.
• Cerumen impaction: Cerumen in the ear canal can reflect sound back toward the microphone, causing feedback. Inspect the ear canal and remove cerumen if present before adjusting the hearing aid.
• Feedback manager calibration: Run the feedback manager calibration in the fitting software with the hearing aid properly seated in the ear. Recalibration is required after any change to the earmold or dome.
• Gain reduction: If feedback persists after recalibration, reduce gain in the high frequencies (above 2 kHz) where feedback most commonly occurs. Verify that the reduction does not compromise audibility of important speech cues.
• Earmold modification: For custom earmolds, consider adding a canal lock, lengthening the canal portion, or remaking the earmold with a tighter fit. For BTE devices, verify the earmold tubing is not kinked or cracked.
• Microphone placement: Feedback is more likely when the microphone is close to the ear canal opening. In RIC devices, verify the receiver wire length is appropriate — a wire that is too short pulls the receiver out of the canal.

Occlusion effect

The occlusion effect — the perception that one's own voice sounds hollow, boomy, or "in a barrel" — is caused by low-frequency bone-conducted sound being trapped in the occluded ear canal and amplified. It is most common with closed earmolds and custom ITE devices.

• Vent modification: Increasing vent size reduces the occlusion effect by allowing low-frequency sound to escape the ear canal. For custom earmolds, enlarge the vent. For RIC devices, switch to a more open dome.
• Deep canal fitting: Fitting the earmold or receiver deeper in the ear canal (past the bony-cartilaginous junction) significantly reduces the occlusion effect by reducing the volume of the trapped air space. IIC and deep-canal CIC styles are particularly effective.
• Low-frequency gain reduction: Reducing gain below 500 Hz can reduce the perception of occlusion without significantly affecting speech understanding.
• Own Voice Processing (OVP): Signia's OVP technology uses a separate processing path for the patient's own voice, specifically addressing the occlusion effect. For patients who are highly sensitive to their own voice, OVP-equipped devices may be worth considering.
• Acclimatization counseling: For mild occlusion, counsel the patient that the perception often diminishes over the first few weeks as the brain adapts. Set realistic expectations and schedule a follow-up to reassess.

Sound quality complaints

Sound quality complaints are among the most challenging to troubleshoot because they are subjective and highly variable. Common complaints and approaches:

• "Everything sounds tinny / too sharp": High-frequency gain is too high relative to the patient's acclimatization level. Reduce high-frequency gain and implement an acclimatization schedule. Verify that the fitting target is appropriate for the patient's degree of loss.
• "Sounds are too loud / uncomfortable": Check MPO settings and verify they do not exceed the patient's loudness discomfort levels. Reduce overall gain and recheck with real-ear measurement.
• "Speech sounds muffled": Insufficient high-frequency gain. Verify fitting against prescriptive targets with REM. Check for wax guard blockage or receiver failure affecting high-frequency output.
• "Background noise is overwhelming": Noise reduction settings may need adjustment. Verify directionality is functioning correctly. Counsel the patient on realistic expectations for noise environments and consider a remote microphone accessory for particularly difficult situations.
• "Music sounds distorted": Hearing aids are optimized for speech, not music. Music programs with reduced noise reduction and compression are available in most premium devices. Enable a dedicated music program and counsel the patient on its use.
• "Sounds echo / reverberant": Excessive reverberation perception can result from high gain in a reverberant environment. Verify that the hearing aid's reverberation reduction feature is enabled if available.

Connectivity and streaming problems

Bluetooth connectivity issues are increasingly common as more patients use streaming features. Systematic troubleshooting:

• Re-pair the devices: Delete the hearing aids from the phone's Bluetooth settings and re-pair from scratch. This resolves the majority of connectivity issues.
• App reinstall: Uninstall and reinstall the manufacturer app. Corrupted app data can cause persistent connectivity failures.
• Phone compatibility: Verify the patient's phone model and OS version are on the manufacturer's compatibility list. Older phones and some Android models have known compatibility issues.
• Hearing aid firmware update: Check whether a firmware update is available for the hearing aids. Firmware updates often include Bluetooth stability improvements.
• Interference: Bluetooth interference from other devices (other hearing aids, wireless headphones, smart home devices) can cause connectivity instability. Ask the patient to test in a different environment.
• Battery level: Low battery can cause Bluetooth instability in some devices. Verify the hearing aids are adequately charged before troubleshooting connectivity.

Persistent dissatisfaction despite technical correctness

When a hearing aid is technically correct — verified with REM, electroacoustically within spec, and programmed to target — but the patient remains dissatisfied, the issue is usually one of three things:

• Unrealistic expectations: Return to the counseling conversation. Use QuickSIN results to quantify the patient's SNR loss and explain why noise environments will remain difficult. Review the COSI goals and assess whether the patient's expectations align with what hearing aids can realistically achieve.
• Acclimatization: New hearing aid users, particularly those with long-standing untreated loss, need time to adapt to amplified sound. Implement a structured acclimatization schedule — start at a reduced gain level and increase over 4–8 weeks. Document the schedule and follow up at each stage.
• Underlying auditory processing issues: Some patients have central auditory processing difficulties that limit their ability to benefit from amplification even when the peripheral hearing loss is well-managed. Consider referral for central auditory processing evaluation if benefit is consistently below expectations.