First, ensure that the MPS-24B is receiving power by checking the voltage across its terminals. If power is confirmed, check for any loose connections or damaged wiring. Next, inspect the device for any visible signs of damage or wear. If everything appears intact, try resetting the MPS-24B by disconnecting power for a few minutes and then reconnecting it. If the issue persists, it may require further diagnosis or potentially replacement. Remember to always follow proper safety precautions when working with electrical equipment.