Light Assembly – The light assembly might be defective. Some manufacturers don’t sell the light assembly components separately, and instead require you to purchase the light assembly.
Light Bulb – The light bulb might be out. Replace the light bulb before replacing any of the other parts associated with the light bulb.
Light Switch – To determine if the light switch is defective, use a multi-meter to test it for continuity. If the light switch does not have continuity, replace it.
Door Switch – To determine if the door switch is defective, use a multi-meter to test it for continuity. If the door switch does not have continuity when activated, replace it.
Light Socket – To determine if the light socket is defective, use a multi-meter to determine if the socket is getting power. If the socket is getting power, but the light bulb won’t work, this indicates that the light socket is defective. If the light socket is defective, replace it.
Light Board – First, ensure that the light board is receiving the proper amount of voltage. If the light board is receiving sufficient voltage, but the refrigerator light will not work, replace the light board.