WP4387499 - Genuine OEM Whirlpool Refrigerator Defrost Thermostat

SKU : WP4387499
$120.86
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WP4387499 – Genuine OEM Whirlpool Refrigerator Defrost Thermostat

The WP4387499 Genuine OEM Whirlpool Refrigerator Defrost Thermostat is an original manufacturer bimetal safety control designed for Whirlpool refrigerators and compatible brands such as KitchenAid, Maytag, Amana, and Kenmore (select models). This OEM defrost thermostat is engineered to regulate the defrost cycle by sensing evaporator temperature and protecting the defrost heater from overheating.

Available from Appliance Kingdom (Canada-wide shipping from Edmonton, AB), this part is commonly used to resolve refrigerator cooling and frost-related defrost system failures and restore proper temperature regulation and airflow inside the freezer compartment.

Function & Importance of the Defrost Thermostat

The defrost thermostat is a critical safety and control component in Whirlpool refrigerator defrost systems. It attaches directly to the evaporator coil and monitors temperature during the defrost cycle.

When temperatures drop below a set threshold, it allows the defrost heater to operate. Once the evaporator reaches a safe upper limit, it shuts the heater off to prevent overheating and damage.

Using a genuine OEM part ensures:

  • Accurate temperature sensing
  • Safe defrost cycle operation
  • Proper evaporator protection
  • Stable long-term cooling performance

A failing thermostat can disrupt the entire defrost cycle, leading to ice buildup and restricted airflow.

Common Symptoms of a Faulty Defrost Thermostat

A failing WP4387499 defrost thermostat may cause the following Whirlpool refrigerator issues:

  • Excessive frost or ice buildup on evaporator coils
  • Refrigerator section becoming warm while freezer remains cold
  • Poor or inconsistent cooling performance
  • Frost blocking airflow to the refrigerator compartment
  • Refrigerator running continuously without proper temperature recovery
  • Intermittent cooling cycles or unstable freezer temperature

In many cases, replacing the defrost thermostat helps restore normal defrost operation when it is confirmed to be the faulty component. However, similar symptoms may also occur due to a defective defrost heater, thermistor, or control board, so proper diagnosis is important.

Compatibility Guidance

This part is compatible with Whirlpool refrigerator defrost systems and select models from related Whirlpool family brands.

Before ordering:

  • Always verify your refrigerator’s model number
  • Confirm compatibility with WP4387499 in your service documentation or parts lookup
  • Contact Appliance Kingdom support if you need assistance

Replaces Part Numbers (Verified)

WP4387499 is confirmed to replace multiple OEM and superseded part numbers, including:

  • 4387499
  • AP6009314
  • 0056496
  • 0056841
  • 0056939
  • 0057124
  • 0310631
  • 0311163
  • 0311642
  • 1100435 / 1100436
  • 1108164 / 1108165
  • 1108199
  • 1108574 / 1108575
  • 1110545 / 1110546
  • 1110762 / 1110763
  • 1113044 / 1113405
  • 1115456 / 1115457
  • 1118688 / 1118690 / 1118691
  • 1118824 / 1118826
  • 1127661 / 1127753 / 1127754 / 1127771
  • 2000528
  • 2151215 / 2154544
  • 483084
  • 942871 / 942872
  • 99989720
  • R0950190
  • Y0056496 / Y0056841 / Y0056939 / Y0057124
  • Y0310631 / Y0311163 / Y0311642

Key Features & Benefits

  • Genuine OEM Whirlpool replacement part
  • Designed for precise evaporator temperature control
  • Helps restore proper defrost cycle operation
  • Prevents overheating of defrost heater
  • Durable construction for long-term reliability
  • Ensures correct airflow and cooling performance
  • Trusted by technicians and appliance repair professionals

Installation Overview

Installation is considered moderate difficulty and typically requires access to the freezer evaporator assembly.

Steps generally involve:

  • Removing freezer interior panels
  • Locating and replacing the clipped-on thermostat
  • Ensuring proper wiring connections

Because this part is part of the electrical defrost system, professional installation is recommended unless the user has appliance repair experience.

Always disconnect power before servicing.

Canada-Wide Availability & Supplier Trust

Appliance Kingdom supplies genuine OEM appliance parts across Canada, including Ontario, Alberta, British Columbia, and other provinces.

Customers benefit from:

  • Fast Canada-wide shipping
  • OEM-quality parts from trusted manufacturers
  • Support for compatibility verification
  • Reliable sourcing for appliance repair professionals and homeowners

Buyer Confidence & Reassurance

When you choose WP4387499 from Appliance Kingdom, you get:

  • Genuine OEM Whirlpool engineering
  • Reliable defrost system performance restoration
  • Confidence in fit and compatibility (when model verified)
  • Support from a Canada-based appliance parts supplier

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