KitchenAid Microwave Repair

KitchenAid microwaves come as over-the-range units with an exhaust fan and lights, built-in models that pair with wall ovens, and some with convection capability. The core of each is the same: a magnetron powered by a high-voltage transformer, capacitor and diode, a set of door interlock switches, a turntable motor and an electronic control. Over-the-range models add a vent fan and light that run off the same control.

A microwave that lights and turns but leaves food cold usually has a high-voltage fault: a failed magnetron, diode, capacitor or transformer. Door switches wear out and can stop the microwave from starting or blow a fuse. Keypads and touch panels can become unresponsive, sometimes from steam or grease. On over-the-range models, the vent fan motor wears out, and a failed thermostat can leave the fan running constantly. Convection models add a heating element and fan behind the cavity, and either can fail independently of the microwave side.

Some checks are safe. Make sure the door closes firmly and the latch is not damaged. Reset the microwave at the breaker for a minute after a storm. Clean the grease filters on an over-the-range unit. Do not try to repair the internals yourself; the capacitor can hold a dangerous charge even after the power is off. If you see sparking inside, stop using it.

Our diagnosis starts by safely discharging the high-voltage circuit, then testing the magnetron, diode, capacitor, transformer and door switches. We check the control board and keypad. For over-the-range models, we test the vent fan and thermostat. Built-in and over-the-range units may need to be removed from the wall or cabinet for repair.

Door switches, fans and keypads are usually reasonable repairs. A failed magnetron or board on an older over-the-range model may cost a large share of a replacement, while a built-in or convection model usually justifies more repair.