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The lights underneath my microwave hood combo model 721.80592 won’t work. I was in the middle of replacing the bulbs when one broke and the glass bulb tore off from the base. There was a pop and the other light went out. Now even replacing both bulbs, they won’t work. I’m wondering if there is a fuse I can replace to fix them. The microwave and fan and inside lights all still work, it’s just the underneath lights that light up your cooktop. Thank you!
Hi, There is no separate fuse for the cooktop lights. Didn’t you have the power disconnected from the microwave oven when replacing the lamps? Looking at the wiring diagram for the oven series (see below), it appears as though a back to back diode, associated with relay RY14 on the control board, may have been damaged. Be safety aware when working in microwave ovens. The HV capacitor can store >5000V DC for months, even if the power has been disconnected for this length of time. This amount of voltage can seriously injure you. The power needs to be disconnected from the oven and then the HV capacitor needs to be correctly discharged as soon as it is accessible after the removing the cover from the oven and before commencing any further work in the oven.
(click on image). If you don’t know how to check for and replace damaged electronic components, contact a reputable, professional appliance repair service and ask for a quote.
