WP4387500 - Genuine OEM Whirlpool Refrigerator Defrost Thermostat

SKU : WP4387500
$119.66
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WP4387500 – Genuine OEM Whirlpool Refrigerator Defrost Thermostat

The WP4387500 Genuine OEM Whirlpool Refrigerator Defrost Thermostat is an original factory-engineered bi-metal safety control component designed for Whirlpool refrigerators and compatible refrigerator brands. This OEM defrost thermostat is used to regulate the defrost cycle by sensing evaporator temperature and preventing overheating during automatic defrost operations. It is available from Appliance Kingdom with Canada-wide shipping, making it a reliable replacement solution for restoring proper cooling performance in refrigerators that suffer from frost buildup and defrost system failures.

This part is widely used across Whirlpool ecosystem appliances, including Whirlpool, Maytag, KitchenAid, Jenn-Air, Amana, Kenmore, Roper, Estate, and others.

Function & Importance of the Defrost Thermostat

The defrost thermostat plays a critical role in the refrigerator’s defrost system. It is typically clipped to the evaporator coil and monitors temperature during the defrost cycle.

When temperatures drop below a specific threshold, the thermostat allows the defrost heater to activate and melt ice buildup on the evaporator coils. Once the coil reaches a safe temperature, it shuts off the heater to prevent overheating.

Using a genuine OEM part like WP4387500 ensures precise temperature sensing and electrical reliability. This is essential because incorrect defrost timing can lead to:

  • Excessive ice buildup on evaporator coils
  • Airflow blockage inside the freezer compartment
  • Compressor strain due to poor cooling efficiency
  • Long-term damage to the refrigeration system

OEM-grade accuracy ensures safe cycling and long-term appliance protection.

Common Symptoms of a Faulty Defrost Thermostat

A failing WP4387500 defrost thermostat can lead to several refrigerator performance issues, including:

  • Excessive frost or ice buildup on evaporator coils
  • Refrigerator section not cooling properly
  • Freezer cooling but fresh food section becoming warm
  • Inconsistent or fluctuating temperatures
  • Water leakage inside or under the refrigerator
  • Defrost cycle not activating correctly
  • Compressor running continuously without efficient cooling

In many cases, replacing a faulty defrost thermostat restores normal airflow and cooling performance once ice blockage is cleared.

Compatibility Guidance

This part is designed for use in Whirlpool-style refrigerator defrost systems, including select models from Whirlpool and affiliated brands.

Before ordering:

  • Always verify your appliance model number
  • Confirm the part number WP4387500 is listed for your unit
  • Ensure proper diagnosis of the defrost system (thermostat, heater, control board)

Appliance Kingdom recommends model verification before purchase to ensure correct fitment and performance.

Replaces Part Numbers

Verified cross-reference replacements for WP4387500 include:

  • 4387500
  • 1115192
  • 1115193
  • 1118825
  • 1121294
  • 1121295
  • 1127805
  • 1127867
  • 1127868
  • AP6009315

 

Key Features & Benefits

  • Genuine OEM Whirlpool-manufactured defrost thermostat
  • Bi-metal safety design for accurate temperature control
  • Prevents evaporator overheating during defrost cycles
  • Improves refrigerator cooling efficiency and airflow
  • Engineered for long-lasting durability and reliability
  • Designed for exact OEM fit and performance
  • Suitable for homeowners, landlords, and appliance technicians

Installation Overview

The WP4387500 defrost thermostat is typically installed on the evaporator coil inside the freezer compartment.

Installation considerations:

  • Moderate difficulty level
  • Requires access to freezer evaporator assembly
  • Electrical safety precautions required (disconnect power before servicing)
  • Clip-on installation design for secure coil attachment

Experienced DIY users may complete installation, but professional repair is recommended if diagnosis or wiring access is uncertain.

Canada-Wide Availability & Supplier Trust

Appliance Kingdom supplies genuine OEM appliance parts across Canada, ensuring fast and reliable delivery from within the country.

Customers benefit from:

  • Canada-wide shipping and support
  • OEM-grade replacement parts
  • Reliable sourcing for Whirlpool appliance repairs
  • Support for homeowners, property managers, and technicians

Buyer Confidence & Reassurance

  • Genuine OEM Whirlpool component
  • Tested compatibility within Whirlpool refrigerator systems
  • Reliable defrost performance restoration
  • Helps resolve frost-related cooling issues
  • Expert support available for compatibility confirmation before purchase

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