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If the rest timer did not make a sound or vibration, start with the device settings. The exact labels depend on the operating system and the release you installed.

Check notifications

Open the device notification settings for Rackd and confirm that notifications and sound are allowed. If the app exposes a Rest timer or Workout channel, leave that channel enabled.

Check interruption settings

Do Not Disturb, Focus, Sleep, and similar modes can silence a timer. Add Rackd to the allowed list for the mode you train under, or turn the mode off for one test session.

Check battery rules

Some devices pause background work to save power. If the screen locks before the timer ends, allow Rackd to run in the background for a test, then run the timer again.

If the timer still fails, send the device model, operating system, and the session state to support. The useful detail is what the phone did, not a guess about why.