Whirlpool 4387478 Refrigerator Interior Light Socket Kit – OEM Replacement

Product Description
Restore illumination inside your refrigerator with the genuine OEM replacement light socket kit, part number 4387478, designed for many Whirlpool, Maytag, KitchenAid and affiliated-brand models. According to the parts listing, this socket houses the light bulb and ensures proper electrical connection when the door opens. Whirlpool Parts+2Reliable Parts+2
Because the socket configuration, wiring harness, mounting style and bulb type can vary by model and production year, please check with your maintenance technician prior to ordering to confirm that 4387478 is the correct socket for your particular appliance model.

Features & Benefits

• OEM quality fit & finish: Designed by Whirlpool for models that call for part 4387478, ensuring correct fit and secure mounting. Reliable Parts+1

• Includes socket kit components: The kit typically includes the socket housing, light shield, and wire terminals as needed (depending on model). Reliable Parts

• Restores interior lighting: If your refrigerator light bulb is fine but no light comes on when the door opens, the socket often is the cause—and replacing it can restore proper illumination.

• Cost-effective repair: Instead of replacing entire lighting harnesses or complicated modules, swapping the socket is a straightforward and affordable fix.

Common Symptoms That Indicate Replacement Is Needed

• The refrigerator interior light fails to come on when the door opens, despite bulb being replaced. eReplacement Parts+1

• Flickering light or intermittent lighting inside the fridge, suggesting a poor connection at the socket.

• Visible damage to the old socket housing (cracks, burnt terminals, loose wires) when inspected.

• You’ve checked the bulb, door switch and wiring, yet the light remains inoperative—socket is likely the next logical component.

Cross Reference / Alternate Part Numbers

• Replaces older or superseded part numbers: 1129370, 2162085, 200779, etc. Commercial Equipment and Parts+1

• Fits multiple affiliated brands including Whirlpool, Kenmore & KitchenAid (always verify model & part) Commercial Equipment and Parts+1

Compatibility Notes

• Confirm your refrigerator’s model number, existing socket part number, bulb type (incandescent/LED) and mounting arrangement. Even though 4387478 is widely used, some variations exist by model year and brand.

• If other lighting components (door switch, bulb housing, wiring) are damaged or corroded, replacing the socket alone may not restore the light—have your technician inspect the full lighting circuit.

• Installation typically requires removing the light bulb and housing, disconnecting the old socket, and installing the new socket kit—all with power off (unplug appliance) for safety. Reliable Parts

• Replacing the socket restores the light function but will not resolve unrelated problems (e.g., door gasket leaks, cooling issues, fan failures). Those require separate diagnosis.