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4387503 Refrigerator Bimetal Defrost Thermostat Compatible with Whirlpool Kenmore KitchenAid Maytag, Replaces WP4387503 AP6009317 2149641 4343917 61002113
  • 4387503 Refrigerator Bimetal Defrost Thermostat Compatible with Whirlpool Kenmore KitchenAid Maytag, Replaces WP4387503 AP6009317 2149641 4343917 61002113
  • 4387503 Refrigerator Bimetal Defrost Thermostat Compatible with Whirlpool Kenmore KitchenAid Maytag, Replaces WP4387503 AP6009317 2149641 4343917 61002113
  • 4387503 Refrigerator Bimetal Defrost Thermostat Compatible with Whirlpool Kenmore KitchenAid Maytag, Replaces WP4387503 AP6009317 2149641 4343917 61002113
  • 4387503 Refrigerator Bimetal Defrost Thermostat Compatible with Whirlpool Kenmore KitchenAid Maytag, Replaces WP4387503 AP6009317 2149641 4343917 61002113
  • 4387503 Refrigerator Bimetal Defrost Thermostat Compatible with Whirlpool Kenmore KitchenAid Maytag, Replaces WP4387503 AP6009317 2149641 4343917 61002113
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Showing 69 compatible models
Aftermarket Replacement · Factory Direct
OEM-compatible part built to original specifications. Not manufactured by or affiliated with the original equipment brand.

4387503 Refrigerator Bimetal Defrost Thermostat Compatible with Whirlpool Kenmore KitchenAid Maytag, Replaces WP4387503 AP6009317 2149641 4343917 61002113

SKU: 4387503
OEM RetailBranded
$43.99
Via distributor
Source: WhirlpoolParts.com · Jan 2025
OEM brand & packaging
Factory direct price
1-year warranty
Our PartBest Value
$28.99
Factory direct
OEM-Compatible
Meets OEM specifications
Factory direct price
1-year warranty
Save by going factory direct
OEM-compatible · no distributor markup
$15.00
34% less than OEM retail
Order within --:-- to ship today
Repair Time20-40 Minutes
DifficultyEasy
DIY FriendlyYes
Tools Needed
Phillips ScrewdriverFlathead ScrewdriverWire NutsMultimeterNeedle-Nose Pliers
Qty
Ships from China · 10–20 business days
No sales tax outside CA
or
4387503 Refrigerator Bimetal Defrost Thermostat Compatible with Whirlpool Kenmore KitchenAid Maytag, Replaces WP4387503 AP6009317 2149641 4343917 61002113
$39.99 Original price was: $39.99.$28.99Current price is: $28.99.
In Stock

This Part Fixes These Problems

Freezer Not Defrosting

If the bimetal thermostat fails open (no continuity when cold), the defrost heater never activates, causing heavy frost and ice to accumulate on the evaporator coils with no automatic defrost cycle.

Frost / Ice Buildup on Evaporator

Excessive ice buildup on the back wall of the freezer or on the evaporator coil fins, often leading to restricted airflow and reduced cooling performance throughout the refrigerator.

Fridge Too Warm

When ice blocks the evaporator, cold air cannot circulate properly into the fresh-food section, causing the refrigerator compartment to run warmer than the set temperature.

Freezer Section Too Warm

A shorted or stuck-closed bimetal can prevent the heater from shutting off, causing the freezer temperature to rise and food to thaw.

Water Leaking Into Refrigerator

When frost is not melted during the defrost cycle, meltwater backs up and overflows the drain pan, leaking from the freezer into the fresh-food compartment below.

Refrigerator Running Continuously

Insulating frost buildup forces the compressor to run non-stop trying to maintain temperature, dramatically increasing energy consumption and shortening compressor life.

Repair Guides

How to Extend Your Whirlpool Defrost Thermostat Life — Maintenance Guide
May 30, 2026
OEM vs Aftermarket Bimetal Defrost Thermostat for Whirlpool: Honest Comparison (4387503)
May 29, 2026
Whirlpool Refrigerator Bimetal Defrost Thermostat Parts — Models & Compatibility
May 29, 2026
Whirlpool Refrigerator Defrost Problems — 5 Causes & How to Fix Ice Buildup
May 27, 2026

Product Description

Why Choose Our 4387503 Bimetal Defrost Thermostat?

🔧
Built to OEM SpecificationsMatches OEM temp rating L43-27°F (L8.9-16.7°C). Clip-on body with two 7.9" inline leads — identical form, fit, and function to Whirlpool WP4387503.
🌡️
Precise Thermal Cut-Off ControlCloses at 18°F during the defrost cycle and opens at the L43 limit to shut off the defrost heater, protecting the evaporator coil from overheating.
🔌
Inline Wiring — Easy Splice ConnectionTwo pre-attached 7.9" leads connect inline with the defrost heater circuit. Simply splice with wire nuts (not included) — no soldering required.
🏷️
Wide Cross-Reference CoverageDirectly replaces WP4387503, AP6009317, 4343917, 2149641, 2149643, 2163894, 2172694, 2182380, 2183072, 2221677, 61002113, 586213, R0950042, PS11742474, WP4387503VP, LP11940 and more.
🏠
Multi-Brand CompatibilityCompatible with Whirlpool, Kenmore, KitchenAid, Maytag, Amana, Jenn-Air, Roper, Estate, Admiral, Norge, Magic Chef, and Caloric refrigerators and freezers.
✅
DIY-Friendly RepairNovice-level repair requiring only basic hand tools. Access the evaporator by removing freezer shelves and the rear panel — no special equipment needed.

💡 Pro Tip: How to Diagnose a Failed Bimetal Defrost Thermostat

Your part is likely the culprit if you notice any of the following:

⚠️ Thick frost or ice buildup on the back wall or evaporator coils of the freezer

⚠️ Refrigerator or freezer compartment running warm despite the compressor running continuously

⚠️ Water leaking from the freezer into the fresh-food compartment (blocked drain caused by unmelted frost)

⚠️ Appliance never completing a defrost cycle — defrost heater remains off even when frost is heavy

🔬 DIY Test: Use a multimeter set to continuity/ohms. When the bimetal is cold it should show zero resistance (closed circuit). Dip it briefly in warm water — it should then show open circuit (infinite resistance). If it fails either test, replace immediately. OEM reference price: ~$40–$44 from authorized Whirlpool parts dealers.

📦 What's in the Box

✅ 1× Bimetal Defrost Thermostat (L43-27°F / L8.9-16.7°C, clip-on, 7.9" leads)

Questions & Answers

Will part 4387503 fit my Whirlpool ET20DMXAW00 refrigerator?
Answered by Support Team  ·  Mar 15, 2024
Yes, the ET20DMXAW00 is a confirmed compatible model for this bimetal defrost thermostat. This part clips directly onto the evaporator tubing in the freezer compartment and connects inline with the defrost heater circuit using two wire leads. Always verify your model number on the label inside the fresh-food compartment door jamb before ordering.
What temperature does the 4387503 bimetal thermostat open and close at?
Answered by Support Team  ·  Nov 20, 2023
This thermostat closes (allows current to flow to the defrost heater) at approximately 18°F (-7.8°C) and opens (cuts power to the heater) at its L43 limit rating of approximately 27°F (-2.8°C). This rating is sometimes expressed as L8.9-16.7°C. If you need a different trip temperature for your model, please verify the correct spec using your appliance's full model number.
How do I test my old bimetal thermostat to confirm it is bad before ordering?
Answered by Support Team  ·  Jan 8, 2025
Use a digital multimeter set to the continuity or resistance (Ω) setting. Remove the thermostat from the evaporator while the freezer is cold. Touch the probes to the two terminals — a good cold thermostat should show zero or near-zero resistance (closed circuit). Next, place the thermostat in a cup of warm water; it should show open circuit (infinite resistance) when warm. If it fails either test, it is defective and should be replaced. A thermostat that shows open circuit even when cold will prevent the defrost heater from ever activating.
Does this part replace the original 4387503 OEM number, or do I need WP4387503?
Answered by Support Team  ·  Jul 22, 2024
The original Whirlpool part number 4387503 was superseded by WP4387503. Both numbers refer to the same component and our aftermarket replacement is fully cross-compatible with both. Other cross-reference numbers for this same part include AP6009317, AP3108454, PS11742474, PS371255, 4343917, 2149641, 2221677, 61002113, 586213, R0950042, and WP4387503VP.
My freezer has a thick block of ice on the back wall but the compressor runs fine — is this the right part?
Answered by Support Team  ·  Feb 10, 2026
Thick ice or frost accumulation on the freezer back wall or evaporator coils is the classic symptom of a failed defrost cycle, and the bimetal defrost thermostat is one of the three components that can cause this (along with the defrost heater and defrost timer/control board). We recommend also checking defrost heater part PS11740357 and defrost timer PS11723171. To isolate which component is faulty, manually advance the defrost timer into the defrost cycle — if the heater activates and melts the frost but the thermostat doesn't cut it off at the right time, the bimetal is the culprit.

We typically respond within 1 business day. Include your appliance model number for the fastest answer.




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    Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.

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