How do I know if my defrost heater is bad?

Common signs include excessive frost buildup in the freezer, the refrigerator not cooling properly, or the freezer thawing. A multimeter can be used to test the heater for continuity; no continuity indicates a faulty heater.

Can a refrigerator work without a defrost heater?

A refrigerator can run without a working defrost heater, but it will eventually develop severe ice buildup on the evaporator coils. This ice will block airflow, leading to poor cooling performance in both the freezer and fresh food compartments, and could damage other components.

Is it safe to replace a defrost heater myself?

Replacing a defrost heater is a manageable DIY repair for those comfortable with basic tools and following instructions. Always disconnect power before starting. If unsure, consult a qualified appliance technician.

Refrigerator Defrost Heater: Symptoms & Replacement

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🏆 RECOMMENDED PART

JCYPMING Refrigerator Defrost Heater Assembly WP67004188 67004188 Compatible with Whirlpool Jenn-Air Kenmore KitchenAid Maytag Fridge Rear H

Compatible With Multiple Refrigerator Brands: Fits Whirlpool, Jenn-Air, Kenmore, KitchenAid, Maytag, Amana, Magic Chef, Admiral, Norge, and Roper Refrigerator models, including ASB2623HRQ, MSD2651HEW, MCD2257HEB, MCD2...
Package Contents: You will receive 1 unit of 67004188 WP67004188 Defrost Heater Assembly
High Quality Construction: This 67004188 WP67004188 Defrost Heater Assembly is an OEM part with a professional production line and upgraded manufacturing process for extended service life, with performance tested befo...
Easy Installation Process: Can be easily installed on your refrigerator or freezer by simply removing the old or damaged heater and replacing it with the new one, with installation videos available online for reference
Replacement Part Number: This defrost heater assembly replaces part number 67004188 and WP67004188, designed to keep cooling coils from frosting over and maintain optimal refrigerator performance

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What the WP67004188 does

The defrost heater melts frost and ice that accumulates on the evaporator coils during the refrigerator's defrost cycle. This prevents ice buildup from obstructing airflow and cooling.

Symptoms when this part fails

Excessive frost buildup on freezer walls
Refrigerator not cooling effectively
Food in freezer thawing
Water leaking from the freezer compartment
Refrigerator running constantly

Compatibility

Fits the Maytag family. Specifically:

Any unit originally equipped with OEM part number(s): 67004188.
Check the model/rating plate inside your appliance and compare it against the fitment table on the product listing before ordering — this guide does not list specific compatible models because Amazon does not provide verified fitment data through this pipeline.

Also replaces: 67004188

Tools you'll need

Screwdriver set
Nut driver set
Pliers
Multimeter

Difficulty: Moderate · Time: 1-2 hours

How to install the WP67004188, step by step

Unplug the refrigerator from the power outlet.
Empty the freezer compartment and remove shelves.
Remove the rear freezer panel to access the evaporator coils.
Locate the defrost heater and disconnect its wiring.
Carefully remove the old defrost heater assembly.
Install the new defrost heater, ensuring secure connections.
Reassemble the freezer panels and shelves.
Plug in the refrigerator and monitor its operation.

Related troubleshooting

If swapping this part doesn't fix the issue, check these next:

What is Refrigerator Defrost Mode and How it Works