The KitchenAid KMHS120ESS is a 1000-watt over-the-range microwave with convection cooking, sensor steam, and a three-speed ventilation system that does double duty as a range hood. It is one of KitchenAid’s most feature-rich OTR models and has been sold in several sub-variants. Repair Clinic stocks genuine KitchenAid OEM parts for all KMHS120ESS variants, including the 40-watt interior bulb, charcoal filters, grease filter, door switches, glass tray, and drive coupling. You can browse the full KitchenAid microwave parts catalog by entering your complete model number to filter to your exact sub-variant.
Genuine OEM Parts for the KitchenAid KMHS120ESS
The KMHS120ESS combines microwave, convection oven, and ventilation functions in a single cabinet, which means it contains more components with more distinct failure modes than a standard countertop microwave. Door switches, light bulbs, charcoal filters, and the turntable drive system all have independent service intervals. Because the KMHS120ESS is a Whirlpool-platform appliance, RepairClinic stocks OEM parts sourced directly from the factory for all KMHS120ESS sub-models. For repair guidance, the microwave repair help section includes model-specific guides for door switch replacement and light bulb access on over-the-range units.
Most Replaced Parts on the KitchenAid KMHS120ESS
Interior Light Bulb
The 40-watt cavity light bulb (part 8206232A) illuminates the interior cooking space. Access requires removing the vent grille at the top front of the unit, tilting it forward, and opening the bulb cover. Always unplug the microwave before starting as KitchenAid specifically calls this out in the service notes for this model. Using the OEM bulb prevents socket overheating from a mismatched wattage rating.
Charcoal Filter
The KMHS120ESS uses two charcoal filters (8206230A), each measuring approximately 5.5 by 5 inches, installed in the top vent assembly. A common service mistake is ordering only one. Replace both filters every six months under normal cooking frequency, or sooner when persistent odors continue after the vent fan runs. The grease filter (W10208631A) is a separate part that should be cleaned monthly.
Door Interlock Switch
The KMHS120ESS uses multiple interlock switches wired in series across the door latch assembly. All switches must confirm the door is closed before the magnetron can energize. A single failed switch prevents the unit from starting entirely. Accessing the switches requires removing the top vent cover and control panel. Note that the switch holder and cam actuator were revised during production to confirm the correct revision when ordering.
Glass Cooking Tray and Drive Coupling
The 14-1/8-inch glass turntable tray (W11402532) rotates on a three-roller support ring driven by the turntable motor through the drive coupling (W10337248). A tray that stops rotating or jerks instead of spinning smoothly usually points to a worn coupling rather than a failed motor. Inspect the coupling and roller ring before replacing the motor. If your original tray is 12-1/2 inches, a different replacement applies to your sub-model.
Grease Filter
The aluminum mesh grease filter (W10208631A) mounts on the underside of the KMHS120ESS and traps airborne grease before it reaches the blower and charcoal filters. A clogged grease filter reduces ventilation performance and accelerates charcoal filter saturation. It measures 12-15/16 by 5-3/4 inches and requires no tools to remove. KitchenAid recommends cleaning it monthly and replacing it when the mesh is damaged or visibly degraded.
Fuse
The KMHS120ESS ceramic fuse protects the microwave’s electrical circuit from overload damage. A blown fuse is almost always caused by a failed door switch that shorts the fuse during door closure rather than by a standalone fuse failure. Before replacing only the fuse, test all door switches for continuity. Replacing the fuse without addressing a failed switch will simply blow the new fuse at the next door closure.
KitchenAid KMHS120ESS Parts at Repair Clinic
- Genuine KitchenAid OEM parts for all KMHS120ESS sub-variants including the KMHS120ESS11, covering bulbs, filters, door switches, tray, and coupling
- Complete KitchenAid microwave parts diagrams and illustrated part lists available on every product page
- Same-day shipping on in-stock parts so light bulb and filter replacements arrive quickly
- 365-day returns on uninstalled parts with no restocking fees
KitchenAid KMHS120ESS FAQs
What light bulb does the KitchenAid KMHS120ESS use?
The interior cavity light uses a 40-watt appliance bulb, manufacturer part number 8206232A. The cooktop surface lights use a different 25-watt halogen bulb, part number W10709921. These are two separate bulbs with different sockets. Always unplug the microwave before replacing either bulb, as the manufacturer specifically recommends disconnecting power first.
How often should I replace the charcoal filter on the KMHS120ESS?
KitchenAid recommends replacing the charcoal filter every six months for average cooking frequency. The KMHS120ESS uses two charcoal filters, part number 8206230A, not one. If odors persist after the vent fan runs, the filters may be saturated and need replacement sooner. Grease filter W10208631A should be cleaned monthly.
My KMHS120ESS will not start at all. What should I check first?
A microwave that will not start is most often caused by a failed door switch. The KMHS120ESS uses multiple interlock switches wired in series. If any one switch fails open, the unit cannot energize. Test each switch with a multimeter for continuity. A blown fuse caused by a failed switch should also be checked and replaced.
What is the glass tray size for the KitchenAid KMHS120ESS?
The standard glass cooking tray for the KMHS120ESS measures 14-1/8 inches in diameter. If your original tray measures 12-1/2 inches, a different replacement tray applies to your specific sub-model. The turntable drive coupling is part number W10337248 and the tray itself is W11402532.
