IHS Troubleshooting Hearing Instruments 4 — Questions and Answers
Question 1: A patient returns saying their hearing aid randomly reboots during the day. The battery checks out fine. What is the most probable cause?
- Normal firmware update cycle
- Moisture or sweat infiltration causing intermittent short circuits (Correct answer)
- Excessive compression limiting
- Telecoil interference
Correct answer: Moisture or sweat infiltration causing intermittent short circuits
Moisture ingress from sweat or humidity is a leading cause of random reboots and erratic behavior in hearing aids.
Question 2: When a hearing aid produces distorted sound even at low volumes and a new battery does not help, which component failure is most likely?
- Receiver (speaker) damage (Correct answer)
- Incorrect NAL-NL2 target
- Excessive vent size
- Low-battery indicator activation
Correct answer: Receiver (speaker) damage
A damaged or partially failed receiver produces distorted output across all volume levels because it can no longer accurately transduce the electrical signal.
Question 3: A patient's BTE hearing aid suddenly has very reduced output. The tubing appears cloudy and rigid. What should the hearing care professional do?
- Reprogram the aid to higher gain
- Replace the hardened, moisture-filled tubing (Correct answer)
- Adjust the vent size
- Switch to omnidirectional mode
Correct answer: Replace the hardened, moisture-filled tubing
Over time, earmold tubing becomes brittle, cloudy, and acoustically dampening; replacing the tubing restores proper sound transmission.
Question 4: A pediatric patient's parent reports the hearing aid produces feedback only at school but not at home. What environmental factor should be investigated first?
- School has higher humidity
- Reflective surfaces like classroom walls cause more acoustic feedback (Correct answer)
- The school has FM interference
- Classroom batteries differ from home batteries
Correct answer: Reflective surfaces like classroom walls cause more acoustic feedback
Hard, reflective classroom walls increase the amount of amplified sound that re-enters the microphone, making feedback more likely in that environment.
Question 5: A patient using a telecoil in a loop system reports noisy, buzzing sound. The microphone mode is fine. What is the most likely cause?
- Telecoil sensitivity set too high picking up electrical interference (Correct answer)
- Feedback from the loop antenna
- Damaged receiver coil
- Incorrect compression attack time
Correct answer: Telecoil sensitivity set too high picking up electrical interference
Telecoils can pick up electromagnetic interference from lighting, motors, or other electronics when sensitivity is high, producing a buzzing or humming artifact.
Question 6: Which step should be performed FIRST when a patient presents with a non-functioning hearing aid?
- Send the aid to the manufacturer for repair
- Perform a systematic check: battery, wax guard, earmold/tubing, then electrical function (Correct answer)
- Reprogram the hearing aid software
- Perform a full audiological re-evaluation
Correct answer: Perform a systematic check: battery, wax guard, earmold/tubing, then electrical function
A systematic basic check—battery, wax guard, physical pathway—resolves the majority of non-functioning aids before advanced diagnostics or repair are needed.
Question 7: A patient reports they can hear sound from their hearing aid only when they press on the battery door. What does this indicate?
- The microphone is loose
- Poor battery contact due to a warped or worn battery door (Correct answer)
- The volume control is stuck
- The receiver tubing is kinked
Correct answer: Poor battery contact due to a warped or worn battery door
Sound only when pressure is applied to the battery door indicates the contacts are not making reliable electrical contact, likely due to a deformed or worn door mechanism.
IHS Troubleshooting Hearing Instruments 4
A patient returns saying their hearing aid randomly reboots during the day.
The battery checks out fine.
What is the most probable cause?