Why a hearing aid stops working, and what to check first
Quick answer
A blocked wax guard is the commonest reason a hearing aid appears to have died, well ahead of an actual device fault. Check the guard first, then a dead or unactivated battery (zinc-air cells need about a minute after the tab is removed), then whether the dome is fully seated, before assuming anything is broken.
"My hearing aid stopped working" is one of the most common calls an audiology clinic gets, and in a large share of those cases the device is not actually broken. It has a blocked wax guard, a dead or newly-installed battery that has not been given a moment to activate, or a dome that has come loose. All three take under a minute to check and none of them require a repair.
This page is built as a diagnostic checklist, in the order that actually fixes the most devices the fastest, before it gets to the point where a real repair is the right call.
What is the single commonest reason a hearing aid appears dead?
A blocked wax guard. Earwax is drawn into the receiver end of the device during normal wear, and the guard exists specifically to catch it before it reaches the internal components. Once it is blocked, sound is muffled or cut off entirely, and the device looks and feels exactly like it has failed, right down to going completely silent. This is also the cheapest and fastest fix on this entire list: a fresh guard, popped in with the tool that comes in the box, and most "dead" devices come right back.
The diagnostic checklist, in order
Check the wax guard first, then the battery, then the dome or tip; a blocked guard and a battery issue together account for most reported failures.
| Symptom | Likely cause | What to check | Fix |
|---|---|---|---|
| Muffled or noticeably weaker sound | Blocked wax guard | Look at the guard for visible wax or discolouration | Replace the guard with a fresh one |
| No sound at all, freshly installed battery | Battery not yet activated | How long ago the tab was removed | Wait about a minute after removing the tab before closing the door |
| No sound at all, older battery | Battery depleted or dead | Battery age and orientation in the door | Replace with a fresh battery |
| Whistling or feedback | Dome not fully seated, or a poor fit | Reseat the dome and check it is the correct size | Reseat, or size up if it keeps recurring |
| Intermittent cutting in and out | Loose dome, moisture, or a partially blocked guard | Check dome seating and guard condition together | Reseat dome and replace guard |
| Crackling or static | Moisture in the device | Recent exposure to sweat, rain or humidity | Run a full drying cycle before wearing it again |
| Rechargeable device will not hold a charge | Dirty charging contacts, or battery reaching end of life | Clean contacts on both device and charger | Clean contacts; if unresolved, the internal battery may need service |
Battery basics that get mistaken for a device fault
Zinc-air batteries, the type used in most hearing aids, are activated by air once the protective tab is peeled off. That reaction is not instant: giving the battery about a minute of open air before closing the door is enough to avoid a false "dead on arrival" diagnosis on a battery that is actually fine. Orientation matters too; a battery placed the wrong way round in its door will not make contact even though it looks correctly seated. A fresh Duracell Hearing Aid Batteries Size 312, 32 count and thirty seconds of patience rules out this entire category before anything else is touched.
How often should a wax guard actually be changed?
Most wearers change a wax guard every four to eight weeks; heavy wax producers need it every two to four weeks or the device repeatedly goes quiet.
| Earwax level | Typical interval | What it looks like |
|---|---|---|
| Light | 8 to 12 weeks | The device rarely sounds muffled and the guard looks clean when changed. |
| Average | 4 to 8 weeks | The usual case; most people land here. |
| Heavy | 2 to 4 weeks | The device goes quiet or dead repeatedly and a new guard restores it each time. |
| Very heavy | 1 to 2 weeks | Weekly changes; repeated blockage at this rate is itself worth raising with a clinician. |
When it really is a device fault
If the guard is fresh, the battery is confirmed good, the dome is properly seated, and the device has been thoroughly dried with no improvement, that is the point to stop troubleshooting at home and contact the manufacturer or the audiologist who provided the device. Internal faults, damaged microphones, and receiver failures are real, but they are also far less common than the four causes above, and ruling those out first saves a genuinely broken device the unnecessary trip.
Common questions
- What is the most common reason a hearing aid seems to stop working?
- A blocked wax guard, by a wide margin. Earwax collects at the guard during normal wear, and once it blocks, sound becomes muffled or cuts out entirely, mimicking a device failure exactly. Replacing the guard, a task that takes under a minute with the tool provided, resolves this cause on its own.
- Why does a brand new battery sometimes seem dead?
- Zinc-air hearing aid batteries are activated by exposure to air once the tab is removed, and that reaction takes a short time to complete. Closing the battery door immediately after removing the tab, before giving it about a minute, is a common reason a genuinely good battery appears dead on first use.
- How do I know if it is the dome and not the device itself?
- Whistling, feedback, or sound cutting in and out are the classic signs of a dome that is not fully seated or is the wrong size, rather than an internal fault. Removing the dome, checking it for damage, reseating it fully, and trying a different size if the problem repeats usually settles the question quickly.
- How often should I actually change my wax guard?
- Most wearers land in the four to eight week range, but the real signal is the device sounding weak or going quiet rather than a fixed schedule. Heavy earwax producers may need a change every two to four weeks, and repeated blockage at that rate is worth mentioning to a clinician.
- When should I stop troubleshooting and call for a repair?
- Once a fresh wax guard, a confirmed good battery, a properly seated dome, and a full drying cycle have all been tried without improvement, that is the point to contact the manufacturer or the audiologist who fitted the device. Those four causes account for the large majority of reported problems, so ruling them out first is worth the few minutes it takes.
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Last updated 2026-09-17.