WP4387503 - Genuine OEM Whirlpool Refrigerator Defrost Thermostat

SKU : WP4387503
$49.40
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WP4387503 – Genuine OEM Whirlpool Refrigerator Defrost Thermostat

The WP4387503 Genuine OEM Whirlpool Refrigerator Defrost Thermostat is a factory-designed bi-metal temperature control component used in Whirlpool, Kenmore, KitchenAid, and other compatible refrigerators and freezers. Available across Canada from Appliance Kingdom, this OEM defrost thermostat ensures reliable defrost cycle regulation and consistent cooling performance in your refrigerator system.

This part is critical for preventing ice buildup on the evaporator coils and is commonly replaced when refrigerators begin showing cooling imbalance, frost accumulation, or defrost cycle failure. It is a Genuine OEM Whirlpool component, engineered to meet original manufacturer specifications for safety, precision, and long-term durability.

Function & Importance of the Defrost Thermostat

The defrost thermostat acts as a safety temperature sensor mounted on the evaporator coil inside the refrigerator’s freezer section. Its primary role is to monitor coil temperature during the defrost cycle and shut off the defrost heater once the frost has melted.

This precise temperature control is essential because:

  • It prevents overheating of the evaporator system
  • It ensures efficient and complete defrost cycles
  • It maintains proper airflow across cooling coils
  • It protects surrounding components from heat damage

When working correctly, the thermostat allows the refrigerator to alternate smoothly between cooling and defrost cycles, ensuring stable temperature performance.

Common Symptoms of a Faulty Defrost Thermostat

A failing WP4387503 thermostat can disrupt the entire defrost system. Common issues include:

  • Excess frost or ice buildup on evaporator coils
  • Refrigerator or freezer not cooling properly
  • Freezer too warm or inconsistent temperature
  • Refrigerator section warming while freezer appears cold
  • Defrost cycle not completing properly
  • Reduced airflow due to ice blockage
  • Refrigerator running continuously without stabilizing temperature

If these symptoms are present, replacing the defrost thermostat often resolves defrost-related failures when correctly diagnosed as the root cause.

Compatibility Guidance

This defrost thermostat is designed for Whirlpool refrigerator and freezer systems, including select models from related brands under the Whirlpool manufacturing group.

Before purchasing:

  • Always verify your appliance model number
  • Confirm that WP4387503 is listed as the correct replacement part for your unit
  • Ensure proper diagnosis of the defrost system (heater, timer/control board, thermostat)

Proper model verification ensures correct fitment and avoids unnecessary replacement.

Replaces Part Numbers

  • 4387503
  • 2221677
  • 61002113
  • 4343917
  • 2183072
  • 2182380
  • 2172694
  • 2163894
  • 2149643
  • 2149641

Key Features & Benefits

  • Genuine OEM Whirlpool replacement part
  • Engineered for precise evaporator temperature control
  • Helps restore proper defrost cycle operation
  • Prevents frost buildup and airflow blockage
  • Designed for durability and long service life
  • Meets original manufacturer electrical and safety standards
  • Suitable for homeowners and professional appliance technicians

Installation Overview

Installation is generally considered moderate difficulty, depending on refrigerator design.

Typical steps include accessing the evaporator compartment inside the freezer, removing the old thermostat from the coil, and installing the replacement clip-on unit.

Because this part is part of the electrical defrost system:

  • Always disconnect power before servicing
  • Handle wiring connections carefully
  • Professional installation is recommended if you are not experienced with appliance repair

Canada-Wide Availability & Supplier Trust

Appliance Kingdom supplies genuine OEM Whirlpool appliance parts across Canada, supporting homeowners, landlords, and appliance repair professionals nationwide.

  • Fast Canada-wide shipping
  • Reliable OEM quality assurance
  • Support for compatibility confirmation before purchase
  • Trusted source for refrigerator repair components

Buyer Confidence & Assurance

  • Genuine OEM Whirlpool manufacturing quality
  • Designed for accurate fit and performance
  • Helps restore proper defrost system operation
  • Backed by dependable Canadian supplier support
  • Confidence in long-term refrigeration performance

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