Maytag Refrigerator ABB2221FEB2 Freezer not defrosting

The Defrost Thermostat is an OEM part for Whirlpool refrigerators. It monitors the temperature of the evaporator coil and signals the defrost heater to turn on when necessary, preventing frost buildup on the coil.

You should replace the defrost thermostat if it becomes faulty or damaged. Causes of a bad defrost thermostat can include electrical issues, exposure to moisture, or general wear and tear over time.

Symptoms of a bad defrost thermostat include:

• Frost buildup on the evaporator coil
• The refrigerator running constantly or not cooling properly
• Water leaks inside the refrigerator
• The defrost heater not activating during the defrost cycle

This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.

This refrigerator defrost timer automatically starts and ends the defrost cycle to melt frost from the evaporator coils. Replacing a failed timer restores consistent cooling performance and helps prevent frost buildup that can restrict airflow.

• Controls the timed switch between cooling and defrost to keep evaporator coils clear of frost
• Common symptoms of failure: heavy frost on the evaporator or back panel, fresh food section too warm, unit runs constantly, or won't resume cooling after defrost
• Restores proper frost removal and airflow for stable temperatures
• Designed to match the original timer's function and wiring connections for applicable models

• Disconnect power before servicing; wear cut-resistant gloves
• Access location varies by model—often in the fresh food control housing or rear machine compartment
• Photograph/label wire positions and transfer them to the matching terminals on the new timer
• Reuse original mounting hardware and install in the same orientation as the original