1. Press the RESET / Rucksetzen button. 2. Turn on the hot tub at the control panel. 3. Press the TEST button on the current protector - the light on the protector must turn off and the motor part of the PureSpa hot tub will stop. If this does not happen, the protector is defective. 4. If the test is correct, press the RESET button - the light should come back on. If the protector is faulty, you can claim it from your dealer (if the hot tub is under warranty) or purchase it as a replacement part from us.