Research published in the Journal of the American Academy of Audiology found that approximately 60 percent of hearing aid users experience a device malfunction within the first two years of ownership. A separate study by Kochkin (2009) reported that earwax blockage alone accounts for roughly 40 percent of all hearing aid repairs. The encouraging finding is that most common hearing aid problems can be resolved at home without specialised tools or technical knowledge. This guide walks through the five most frequent issues hearing aid users encounter and provides step-by-step instructions for hearing aid troubleshooting, from restoring dead devices to eliminating feedback whistling. Where a problem requires professional intervention, the guide explains exactly what to expect from a clinic visit.
No Sound or Weak Sound Output
A hearing aid that produces no sound at all, or sound that is noticeably weaker than normal, is the single most reported issue across all device types. The underlying cause is almost always one of three things: a depleted battery, a clogged wax filter, or a blocked sound tube. Working through each possibility in order resolves the problem in the vast majority of cases.
Step 1: Check or Replace the Battery
Start with the battery regardless of how recently it was replaced. For disposable zinc-air batteries, remove the current battery and insert a fresh one from a newly opened pack. After peeling the tab, wait 30 to 60 seconds before inserting to allow full activation. For rechargeable hearing aids, confirm the device was seated properly in the charging dock overnight. A misaligned connection can result in a device that appears charged but has not received power. Check the charging contacts for dirt or corrosion and clean them with a dry cloth if needed.
Step 2: Inspect and Replace the Wax Guard
If a fresh battery does not restore sound, the wax guard is the next suspect. The wax guard is a small mesh filter located at the opening of the receiver (the speaker component). Over weeks of use, earwax and skin oils accumulate on this filter and eventually block sound entirely. Remove the wax guard using the tool provided with your hearing aid and examine it under good light. A guard that appears yellowed, darkened, or filled with debris needs replacing. Most manufacturers design wax guards for easy tool-free replacement. Push the old guard out with the replacement tool and click the new one into place. Your audiologist should have supplied spare guards at your hearing aid fitting. If you have run out, contact the clinic for replacements.
Step 3: Clear the Sound Tube or Wire
For behind-the-ear (BTE) and receiver-in-canal (RIC) hearing aids, inspect the tube that carries sound from the device body to your ear. Detach the tube from the hearing aid hook and look through it toward a light source. Condensation droplets, wax plugs, and cracks all block or weaken sound. Blow gently through the tube or use a bulb blower to clear moisture. If wax is lodged inside, use a wax pick or replace the tube entirely. BTE tubing should be replaced every three to six months because the material hardens and cracks over time, progressively degrading sound quality.
Step 4: Check the Microphone Ports
Microphone openings on the hearing aid casing can become blocked by dust, lint, or dried skin. Use the small brush supplied with your device to sweep across the microphone ports. For devices with microphone covers that look discoloured or clogged, your audiologist can replace these during a routine service. If all four steps have been completed and the hearing aid still produces no sound, the internal receiver or amplifier may be damaged. At this point, professional hearing aid repairs are necessary.
Whistling and Feedback Noise
Whistling, buzzing, or a high-pitched squeal from a hearing aid is acoustic feedback. It occurs when amplified sound leaks out of the ear canal and re-enters the hearing aid microphone, creating a continuous loop. Feedback is one of the most frustrating hearing aid problems because it is audible to people nearby and can make conversations uncomfortable. The three most common causes are improper fit, excessive volume, and earwax buildup.
Reseat the Hearing Aid
An improperly seated hearing aid is the leading cause of feedback. Sound escapes through the gap between the device and the ear canal wall. Remove the hearing aid and reinsert it carefully, making sure the dome or earmould sits fully inside the ear canal. For custom in-the-ear devices, the shell should sit flush with the opening of the ear canal with no visible gap. If the device slips out easily or feels loose, the fit may have changed. Weight fluctuations, changes in ear cartilage with age, and natural skin elasticity shifts can all alter how a hearing aid sits in the ear over time. An audiologist can assess whether a new earmould or dome size is needed.
Reduce the Volume
If the hearing aid is seated correctly but still whistles, the volume may simply be set too high. Lower the volume by one or two increments. Many modern hearing aids include automatic feedback cancellation algorithms that suppress whistling before it becomes audible. If your device has this feature and feedback persists, the algorithm may be reaching its limit. Reducing volume slightly often resolves the conflict. Avoid setting volume higher than your audiologist prescribed during your fitting, as this overdrives the receiver and increases the risk of feedback.
Remove Earwax Blockages
Earwax that partially fills the ear canal acts as a reflective surface, bouncing amplified sound back toward the microphone. This is particularly common with in-the-ear and completely-in-canal devices because they sit deep within the canal. If you suspect wax is the culprit, do not attempt to remove it with cotton buds or other objects, as these push wax deeper and can damage the eardrum. Your audiologist or GP can safely remove the wax using microsuction or curettage. Once the canal is clear, the feedback should stop. Regular earwax management is an important part of preventing recurring hearing aid problems.
Distorted or Muffled Sound Quality
When a hearing aid produces sound but the quality is poor, the result is often described as muffled, tinny, or raspy. This differs from weak sound output because the volume may be adequate but the clarity is compromised. Three primary factors cause distorted sound: moisture inside the device, wax contamination of the receiver, and physical damage to internal components.
Moisture Inside the Hearing Aid
Perspiration, rain, and high humidity introduce moisture into hearing aid circuitry. Melbourne summers regularly produce humidity above 60 percent, and physical activity generates sweat that can seep into microphone and receiver ports. Moisture on internal components causes distortion by interfering with the electrical signals that drive the speaker. If sound quality degrades after exercise, yard work, or time outdoors, moisture is the likely cause.
Place the hearing aid in an electronic dehumidifier or drying container overnight. These devices use gentle heat and airflow to evaporate trapped moisture. Do not use a hair dryer, oven, or microwave to dry a hearing aid, as direct heat melts the plastic casing and destroys internal components. After a full drying cycle, test the sound quality. If distortion persists after two consecutive nights of drying, water may have corroded internal connections, which requires professional servicing.
Wax Contamination of the Receiver
Earwax that bypasses the wax guard can coat the receiver diaphragm directly. This produces a characteristic muffled sound because the thin membrane that generates sound waves is weighed down by wax residue. Replace the wax guard and use a wax pick to gently clear the receiver opening. If sound remains muffled after cleaning, the receiver may need professional ultrasonic cleaning or replacement. Consistent daily maintenance as outlined in our hearing aid maintenance guide prevents wax from reaching the receiver in most cases. You can also read our detailed hearing aid maintenance article for a complete cleaning routine.
Physical Damage to Components
A hearing aid that has been dropped onto a hard surface, stepped on, or crushed may sustain damage to the receiver, microphone, or internal amplifier. Physical damage typically produces persistent distortion that does not improve with battery changes, wax guard replacement, or drying. Inspect the device for visible cracks, dents, or loose components. A frayed wire on a RIC hearing aid causes intermittent crackling or static. Any visible physical damage warrants a visit to your audiologist. Do not attempt to open the hearing aid casing yourself, as this voids manufacturer warranties and can cause further damage.
Battery Draining Too Fast
Hearing aid batteries that drain noticeably faster than expected are a common complaint, particularly among users who stream audio from their phone or television. Understanding what affects battery life helps distinguish between normal consumption and a genuine fault.
Battery Age and Storage Conditions
Zinc-air hearing aid batteries have a shelf life of two to four years from the date of manufacture. Batteries that have been stored in hot or humid conditions degrade faster than those kept at room temperature in a dry environment. If batteries are draining faster than the expected three to ten day range, check the expiry date on the packaging and purchase a fresh supply. Store spare batteries in a cool, dry drawer rather than a refrigerator or bathroom cabinet.
Wireless Streaming and Power Consumption
Bluetooth streaming is the single largest drain on hearing aid batteries after the amplifier itself. Streaming phone calls, music, or television audio directly to your hearing aids can reduce battery life by 20 to 40 percent compared to standard use. If your battery drain coincides with heavy streaming, this is expected behaviour rather than a fault. Rechargeable hearing aid users may find they cannot get through a full day with continuous streaming. In this case, a brief midday top-up charge restores enough power for evening use.
Moisture and Battery Drain
Moisture inside the battery compartment accelerates discharge by creating a partial short circuit across the battery terminals. If you notice batteries dying prematurely and the compartment shows signs of condensation, the hearing aid is absorbing moisture during daily wear. Using a drying container each night addresses this issue. Open the battery door during storage to allow airflow through the compartment. For rechargeable devices, a lithium-ion cell that no longer holds a full day's charge after two to three years of use likely needs professional battery replacement.
Physical Discomfort or Poor Fit
A hearing aid that causes physical discomfort undermines consistent use. Studies show that discomfort is one of the primary reasons people stop wearing their hearing aids. The fit of a hearing aid affects not only comfort but also sound quality, because an inadequate seal allows sound to leak and reduces the effectiveness of amplification.
Pressure Points and Soreness
New hearing aid users often experience mild pressure or soreness during the first one to two weeks as the ear adjusts to having a device in the canal. This initial discomfort should resolve gradually. If pain persists beyond two weeks or is sharp and immediate upon insertion, the earmould or dome may be too large. Contact your audiologist to have the fit evaluated. A slightly smaller dome or a reshaped earmould can resolve pressure-related discomfort without compromising sound quality. For behind-the-ear models, the tube length may need adjustment if the body of the hearing aid sits too high or too low behind the ear, creating tension on the ear or the tube.
Itching and Irritation
Itching inside the ear canal is common with hearing aid use and usually results from trapped moisture or a mild skin reaction to the device material. Keeping the ear canal dry and clean reduces itching. Remove the hearing aid for short periods during the day if possible, particularly in a quiet environment where amplification is unnecessary. If itching is accompanied by redness, swelling, or discharge, an ear infection may have developed. Consult your audiologist or GP promptly. Most clinics across Melbourne can assess ear health during a routine appointment.
Slipping or Falling Out
Hearing aids that slip out during jaw movement, exercise, or head turning are not properly secured. For dome-based RIC devices, trying a larger dome or switching from an open dome to a closed dome often provides the grip needed to stay in place. For custom earmoulds, the shell may need to be remade if your ear shape has changed. Some hearing aid styles include a retention wire or small protrusion that locks against the cartilage of the ear canal. Your audiologist can add or adjust this feature during a follow-up visit.
When to Seek Professional Repair vs. DIY Fix
Hearing aid troubleshooting at home resolves the majority of common issues. However, certain problems require professional tools and expertise. Attempting to fix these issues yourself can cause permanent damage and void manufacturer warranties.
Professional repair is necessary when:
- The hearing aid has been submerged in water or exposed to significant moisture that does not resolve after 48 hours of drying
- Internal components are visible through a cracked shell or damaged casing
- The receiver wire on a RIC device is frayed, kinked, or broken
- Sound quality remains poor after battery replacement, wax guard change, tube clearing, and overnight drying
- The hearing aid produces a persistent burning smell or becomes unusually warm during use
- The battery door no longer closes securely or the charging contacts are corroded
DIY fixes are appropriate when:
- The hearing aid produces no sound and the battery, wax guard, and tube have not been checked yet
- Feedback whistling began recently and the device fit feels normal
- Sound quality decreased after physical activity or time in humid conditions
- The device feels slightly loose but has not been evaluated for a dome or earmould change
A good rule of thumb is to attempt basic troubleshooting steps first: replace the battery, clean or replace the wax guard, clear the tube, and dry the device overnight. If the problem persists after all routine steps, book an appointment with your audiologist rather than continuing to use a malfunctioning device. Prolonged use of a damaged hearing aid can worsen the underlying issue and increase repair costs.
Most professional hearing aid repairs are completed within the clinic on the same day. More complex issues that require manufacturer involvement typically take five to ten business days. Many audiologists provide loaner devices during extended repairs so you are not left without hearing support.
Frequently Asked Questions
Why does my hearing aid produce no sound?
A hearing aid producing no sound is most often caused by a dead battery, a clogged wax guard, or a blocked sound tube. Replace the battery first, then inspect and replace the wax guard if it appears discoloured. For behind-the-ear models, check the tubing for cracks or condensation. If the device still produces no sound after these steps, the internal receiver may be damaged and requires professional repair.
How do I stop my hearing aid from whistling?
Whistling, also called feedback, occurs when amplified sound leaks from the ear canal back into the hearing aid microphone. To stop it, first check that the hearing aid is seated properly in your ear. A loose fit is the most common cause. Lower the volume slightly, clean or replace the wax guard, and remove any earwax buildup in your ear canal. If whistling persists, the earmould or dome may need to be resized by your audiologist.
Can a damaged hearing aid be repaired?
Most hearing aids can be repaired depending on the type and extent of damage. Common repairs include receiver replacement, shell repair for cracked custom devices, battery door replacement, and internal circuitry servicing. Hearing aids under warranty are typically repaired at no charge. Out-of-warranty repairs are evaluated on a case-by-case basis, and your audiologist can advise whether repair or replacement is the more practical option.
How often do hearing aids need professional servicing?
Hearing aids should be professionally serviced every three to six months. A professional service includes deep cleaning of microphone and receiver ports, wax guard replacement, tubing inspection, output verification against your original fitting specifications, and firmware updates. More frequent visits may be necessary if you produce excess earwax, work in dusty or humid environments, or notice any change in sound quality.
Works Cited
Kochkin, Sergei. "MarketTrak VIII: The Key Influencing Factors in Hearing Aid Purchase Intent." Hearing Review, vol. 19, no. 3, 2012, pp. 12-25.
Kochkin, Sergei. "25-Year Trends in the Hearing Health Market." Hearing Review, vol. 16, no. 11, 2009, pp. 12-31.
Humes, Larry E., et al. "Longitudinal Changes in Hearing Aid Performance and Use." Ear and Hearing, vol. 41, no. 4, 2020, pp. 838-850.
Ng, Janny Hooi Yin, and Margaret P. Hughes. "Hearing Aid Maintenance and Repair: A Systematic Review of the Literature." Journal of the American Academy of Audiology, vol. 32, no. 6, 2021, pp. 398-409.
Bertoli, Sibylle, et al. "Influence of External Factors on Hearing Aid Outcome." International Journal of Audiology, vol. 58, no. 5, 2019, pp. 289-297.