Bose QuietComfort 25 Troubleshooting

Headphones are not responsive when the power switch is in the on position.

If the battery is installed and the battery life indicator does not light, remove, inspect, and replace the AAA battery. The battery terminal is located on the top of the right side earphone. Ensure the battery is inserted to the correct polarity, positive (+) pointing downward and negative (-) pointing upward. The power indicator should glow green when the headphones are in proper working condition.

If the battery is new and has been inserted with the correct polarity, and the headphones still do not power on, there may be excess dust or debris in the battery compartment. Use compressed air to blow any dust or debris out of the battery compartment. The power indicator should glow green when the headphones are in proper working condition; if the indicator light still does not glow green, use rubbing alcohol and cotton swabs to clean the contacts.

Audio is working well, but the noise cancelling feature is not functioning.

If the headphones are powered on, correctly plugged in, but the noise cancelling is not functioning, take care to make sure that the volume dial is not muted. If the in-remote is set to your desired volume yet still does not provide your preferred volume, ensure that the audio device is turned on and the volume of the audio device is not muted.

Ensure that the headphones are connected properly. The headphones may be improperly connected, or the connection may have come loose. Remove and reset both ends of the headphone connector. Ensure that the auxiliary cord ports are clear of debris that would hinder connection.

If the volume coming from the headphones is either too loud or too quiet, your first step should be to inspect the in-line remote. Set the in-line remote to the highest setting and use the volume controls on the audio device to set the volume to your desired setting.

Check the condition of the audio cable. If the cord is not in working condition (frayed), you may need to replace the cord or wrap it with electrical tape.

The audio from the headphones is only being emitted from one side.

If the audio is only being emitted from one side of the headphones, the balance level might be off. To determine this, you will have to check the balance level of the audio device. If the audio device has balance level adjustment, it may be adjusted incorrectly. Make sure to adjust it to a middle level.

Be sure that the headphones are connected properly. The cable cord may have come loose or is improperly connected. Ensure that there is do debris blocking the port and stopping the connection. Remove and reset the cable jacks on both ends.

The voice control feature on the in-remote is not responding.

If the voice control feature on the in-remote does not respond to your voice, you may not be using the headphones with compatible devices. Refer to the owner's manual of the Bose QuietComfort 25 to ensure that you are using a compatible device. If you are using a compatible device and the voice control still does not respond, the cable cord may have to be replaced.

If the microphone feature is not working, the connection of the cable cord may be incomplete. Check to make sure both ends of the cable cord are properly connected. Make sure there is no loose debris blocking the cable ports.

The audio is either not being emitted by the headphones or is intermittent.

If there is excessive static coming from the speakers, don't start taking apart your headphones just yet. The problem could be a problem with the audio jack on the headphones. The easiest way to test this is to plug the headphones into another device. If the static no longer occurs, the connection may be faulty. You may need to repair your speakers if the static remains.

If the speakers are broken but the audio is chopped or broken, the speakers may be broken; This can happen over time or occur due to high volume strains. To fix this problem, replacement speakers will have to be found and installed.