Parts for KEMS378SSS04 — KitchenAid Microwave

We found 55 parts confirmed to fit the KitchenAid Microwave KEMS378SSS04.

Compatibility table

Prices shown are an informational reference range only, not an offer or an Amazon price — RepairKitHub does not sell parts directly. Each part links to an Amazon search so you can compare current listings yourself.

Common failure areas on this model

The confirmed parts above group into a handful of failure areas. Here is what each points to and how to check it before you order anything.

Heat control (thermostats, fuses, heating element)

Symptom: The appliance runs but heats or cools inconsistently, or shuts off partway through a cycle.

Check: With the appliance unplugged, check continuity across the part with a multimeter -- no continuity means it has failed.

Parts in this group on KEMS378SSS04: W10852735 (Thermostat), WP8304452 (Thermal Fuse 105C).

General hardware and mounting parts

Symptom: A small mechanical or mounting part has failed, cracked, or gone missing.

Check: Compare the physical shape and mounting points to the original piece, and confirm the exact part number against your model plate before ordering.

Parts in this group on KEMS378SSS04: W10131248 (Switch), W10755521 (Wall Oven Door Outer Glass), 8303692 (Latch), W11126044 (SHAFT-TURN), W10754409 (SEAL), W10120229 (Inverter), WPW10776938 (Turntable Coupler), WP8303972 (Blower, 60mm), 8285593 (COVR-WIRE), 9760768 (Bake Element), 8205683 (Interlock), 8304603SS (Range Nameplate), 9760774 (Range Broil Element), W10660052 (Microwave Steamer), 261900 (Range Touch-Up Paint), WP9760774 (Element, Broil), W11346197 (MAGNETRON), W10217711 (Microwave Inverter), W11214480 (ARM), W10794022 (Motor Fan), W10131825 (Wall Oven Temperature Sensor), 8304588BL (Oven Plug Button), 4375348 (Oven Baseless Lamp), W11238401 (Transformer), W11110134 (Microwave Turn Ring), WPW10120235 (Release Rod), W10911403 (Turntable Motor), W11607085 (THRMST-FIX), 4375321 (Fuse (Black)), W10758272 (Convection Fan), 423107022541 (Reflector), W11193483 (Lamp Lens), 8186589 (Meat Probe Receptacle), 350930 (Spray Paint - 12 oz. - White), 72017 (Touch-Up Paint - White).

Storage, trim and cosmetic hardware

Symptom: A cracked shelf, broken door bin, worn hinge, or missing trim piece -- cosmetic and storage wear rather than a functional breakdown.

Check: Match the physical dimensions and mounting tabs of the old part before ordering; these pieces are often model-specific even between visually similar models.

Parts in this group on KEMS378SSS04: W10105790 (6-32 SCREW AND BUMPER AS), W11512489 (TRAY-COOK), W11724411 (GRILL SUPPORT), W11715912 (SPRING CAM CB), W11175831 (RACK), 461967825971 (Screw), W10874474 (Door Hinge), 8205707 (Support), W11684510 (SUPPORT OBI), W10915651 (Cover), W11700292 (Door Torsion Spring), W11373838 (Microwave Turntable Tray), WP4455606 (Range Door Receiver Hinge Right Side), 5304505353 (Dryer Lint Screen Housing), 4450800 (SCREW,8-32 X.375 MTR SC).

Controls, timers and wiring

Symptom: A cycle that doesn't advance, an unresponsive display, or the unit not starting at all.

Check: Look for burn marks or a burnt smell near the board or terminals, and check whether buttons and knobs respond -- a unit that powers on but won't cycle often traces back to this group.

Parts in this group on KEMS378SSS04: W11209404 (Range Wire Harness).

Door, lid switches and latches

Symptom: The appliance won't start, or stops, unless the lid or door is fully latched shut.

Check: Listen for an audible click when the lid or door closes. No click, or a visibly cracked plastic tab on the latch, points to this part.

Parts in this group on KEMS378SSS04: W11029221 (Door Latch).

Interior lighting

Symptom: The interior light doesn't turn on when the door opens.

Check: Confirm power is reaching the socket, then check the door-activated light switch before assuming the bulb itself is at fault.

Parts in this group on KEMS378SSS04: WPW10440740 (Microwave Halogen Bulb).

Before you buy

Match KEMS378SSS04 exactly against the model and serial plate on the appliance itself before ordering anything — a single mismatched character can point to a different production run with different parts. Then check the part number printed or stamped on the part you are replacing against the part numbers in the table above; the printed number is the most reliable way to confirm fitment when a model has gone through multiple production runs. RepairKitHub does not sell parts directly — every part link above routes to an Amazon search for that part number so you can compare current listings and sellers yourself.

How to confirm this is your model

On most microwaves, the model and serial plate sits inside the door frame. Match every character exactly, including letters and dashes at the end — appliance model numbers often have similar prefixes but different suffixes for different production runs.

Neighbouring KitchenAid Microwave models

These model numbers sort next to this one in the catalog and are usually the same product family.

• KEMS378SWH00 — 50 parts
• KEMS378SWH02 — 57 parts
• KEMS378SWH04 — 53 parts
• KEMS378XBL1 — 13 parts
• KEMS378XBL2 — 14 parts
• KEMS378SSS02 — 59 parts
• KEMS378SSS00 — 53 parts
• KEMS378GWH2 — 39 parts
• KEMS378GWH1 — 43 parts
• KEMS378GSS3 — 35 parts

Still not sure?

Use the model lookup tool to search by model or part number, or start from the symptom your appliance is showing.