Maytag Refrigerator MBF2256HEB Freezer not defrosting

The Electronic Control Board is an OEM replacement part for Whirlpool refrigerators. This Electronic (JAZZ) Control Board manages various functions of your refrigerator, ensuring proper temperature control and operation. After installation, the board will need to be programmed. An instruction sheet is included.

Causes of a bad Electronic Control Board can include electrical surges, which can damage components on the board, age-related wear and tear affecting its functionality, and exposure to moisture or extreme temperature fluctuations. These factors can lead to a malfunctioning fridge with erratic behaviors.

Symptoms of a bad Electronic Control Board include:

• The refrigerator not cooling properly
• Irregular defrost cycles leading to frost buildup or thawing issues
• Unresponsive controls or display issues
• The ice maker or water dispenser not working as expected

This OEM Whirlpool part can also be used on Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore/Sears brand appliances.

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 evaporator defrost heater melts frost from the freezer's evaporator coil during the automatic defrost cycle, restoring proper airflow and cooling. Replacing a failed heater helps prevent recurring ice buildup and temperature swings.

• Heats the evaporator coil at set intervals to clear ice
• Maintains airflow so the fresh food section and freezer cool consistently
• Common signs of failure: heavy frost on the back freezer panel or evaporator
• Other symptoms may include warm refrigerator temperatures, reduced airflow, or fan noise from ice contact

• Disconnect power before servicing; wear appropriate PPE
• Access the heater behind the freezer's rear panel; defrost ice with warm air/steam—avoid sharp tools
• Reinstall in the original position; keep wiring clear of the fan and moving/hot parts; ensure secure harness connections
• After reassembly, verify the defrost cycle per service instructions; if frost returns, also check the defrost thermostat/bi-metal and control