Ensure that the battery door is closed.
Replace the battery.
Make sure the tip/dome is not clogged.
Make sure the amplifier case and tubing are clean and dry.
Make sure that the amplifier case is positioned properly behind the ear, and that the tip/dome is positioned properly in the ear canal.
Make sure the volume is turned up, by tapping the upper portion of the rocker switch.
Remove the sleeve tip and attach one of the dome tips. Try the vented dome first, and if still not enough sound, try the closed dome. Be sure to secure the tip. (See page 11 in the user manual.)
Excessive ear wax can prevent sound from entering the ear. Contact your physician.
Changes in your hearing can affect how you hear with The Tweak. Contact a hearing healthcare professional if you suspect any change in your hearing condition.