Maytag Refrigerator MCB2256HEB 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.

This refrigerator defrost thermostat senses evaporator temperature and controls power to the defrost heater. It melts frost when needed and shuts the heater off at a safe temperature to protect components and keep cooling performance steady.

• Monitors coil temperature and opens/closes the defrost heater circuit
• Terminates the defrost cycle at a safe cutoff to prevent overheating
• Helps keep the evaporator clear of ice so air can circulate
• Common symptoms: heavy frost on the freezer back wall/evaporator, warm refrigerator section, fan noise from ice, long run times with little or no defrosting

• Disconnect power before service; use cut-resistant gloves
• Access the evaporator behind the freezer rear panel and fully thaw any ice using heat-safe methods—never chip or pry
• Reinstall the thermostat in the original location with firm metal-to-metal contact on the evaporator; route and secure wiring as originally
• After reassembly, verify defrost operation and confirm unobstructed airflow

This evaporator defrost heater melts frost from the evaporator coil during the automatic defrost cycle to restore airflow and stable temperatures. Replacing a failed heater helps prevent ice buildup that restricts cooling and leads to warm spots. What it does:

• Heats the evaporator coil to clear frost/ice during defrost
• Helps maintain proper airflow between freezer and fresh food sections
• Typical symptoms: heavy frost on the back panel/evaporator, weak cooling or rising temperatures
• Also cause evaporator fan noise from ice contact and longer run times

• 1 evaporator defrost heater

• Disconnect power before servicing; allow any ice to thaw
• Access the heater behind the freezer's rear panel; avoid damaging fins or refrigerant lines
• Secure the heater and route wires exactly as original, keeping them clear of the fan and sharp edges
• Restore power and verify the defrost cycle per the service procedure