Customer Questions and Answers for Latch Sister Board (Motorized Latch Control) by Whirlpool

Irving, The AP6012630 sister board supplies power to the door latch motor when the self-clean cycle is selected but has no effect on the oven or microwave interior lights. The light switch on the latch assembly signals the control when the door is opened, the control board completes the circuit and sends the 120 VAC to the light socket(s) and the bulb illuminates. The microwave interior light is controlled through the primary interlock door switch, when the door is opened, power is supplied to the control board, and the light supply transformer the voltage is converted to a DCV circuit and supplies power to the halogen light bulb and it illuminates. If you're sure the bulbs aren't defective or burnt out, you'll need to check the switches and wiring and replace the control board if all's OK.