Mmv4250ba Parts

This thermistor is a refrigerator temperature sensor that monitors internal air temperature so the control board can regulate cooling. Replaces a failed sensor to help restore accurate temperature readings and more consistent cooling. What it does:

• Senses internal refrigerator temperature and sends a variable resistance signal to the control board
• Helps the control system cycle the compressor and fans correctly for stable temperatures
• Commonly replaced when refrigerator runs too cold, too warm, or has irregular cooling cycles
• Can address temperature-error codes or defrost control issues when the sensor is faulty

• Disconnect power to the appliance before inspecting or replacing the sensor
• Handle the sensor and wiring harness carefully to avoid damage to the probe or connectors
• Install in the original sensor mounting location and secure wiring away from moving parts

This base is the appliance's lower cabinet section that supports internal components and helps stabilize the unit. It restores a solid foundation so the appliance sits level and protects internal parts from floor contact and debris. What it does:

• Provides structural support for the appliance's internal assemblies and controls
• Helps stabilize the unit and reduce excessive vibration or rocking
• Protects wiring, motors and other components from contact with the floor
• A damaged or cracked base can cause noisy operation, misalignment, or uneven sitting

• Disconnect power (and gas if applicable) before beginning any repair
• Follow the OEM service manual for disassembly and reassembly steps
• Replacement may require removing the cabinet and/or drum; having a second person helps with lifting and alignment
• Inspect and reuse original fasteners only if undamaged; replace any worn mounting hardware

This grill vent replaces the front vent grille that directs airflow and covers the oven/range vent opening for a clean appearance. It restores proper airflow routing and keeps debris out of the vent area. What it does:

• Covers and protects the appliance vent opening while directing exhaust airflow
• Helps prevent grease and food debris from entering internal vent passages
• Worn, cracked or missing vents can cause visible gaps, rattling or trapped odors
• Restores the appliance's finished appearance and helps maintain proper ventilation

• Disconnect power to the appliance before starting any repair
• Handle part carefully to avoid scratching the finish; a non-marring tool may be helpful
• Installation usually requires removing the lower access panel or front trim—keep fasteners organized

This fan wheel spins inside the appliance to move air through the system, restoring proper airflow for heating and cooling. It replaces a cracked, worn, or unbalanced wheel to reduce noise and improve performance. What it does:

• Circulates air through the appliance to support heating, cooling, or ventilation
• Helps maintain consistent temperatures and prevents motor overload from restricted airflow
• Reduces rattling or grinding noise caused by a warped or broken wheel
• Restores proper airflow when the original wheel is damaged or missing

• One fan wheel

• Disconnect power to the appliance before starting any repair
• Access may require removing an access panel or cabinet components; follow the manufacturer's service instructions
• Inspect the blower housing and mounting for damage; replace any damaged clips or fasteners
• Ensure the wheel spins freely and is seated correctly on the motor shaft before reassembly

This control transformer provides the low-voltage power needed for the appliance's control board and user interface, restoring reliable operation of displays, timers, and electronic controls. What it does

• Steps appliance line voltage down to the control circuit voltage so electronic controls and displays can operate.
• Commonly replaced when controls, displays, or touchpads lose power or behave intermittently.
• Helps resolve symptoms like dim or blank control displays, non-responsive touch controls, or intermittent electronic operation.
• Designed to match mounting and wiring of the original part for straightforward replacement.

• One transformer assembly as shown.

• Turn off and unplug the appliance (or shut off circuit breaker) before servicing to avoid electrical shock.
• Verify wiring locations and take a photo before disconnecting; reconnect matching each terminal.
• Inspect associated fuses and connectors; replace any damaged wiring or connectors during installation.

This air deflector redirects airflow inside the appliance to help maintain proper circulation and protect components from direct airflow. Replacing a damaged deflector restores intended air paths and can reduce uneven temperature or noise. What it does

• Guides air where the manufacturer intended to ensure even circulation.
• Protects nearby components from direct airflow and wear.
• Helps reduce symptoms like uneven cooling/heating or unusual airflow noise.
• Works as a passive airflow-management part — no electrical connection.

• Disconnect power to the appliance before starting any repair.
• Handle the deflector carefully to avoid cracking plastic tabs during removal or installation.
• Installation typically requires basic hand tools; for exact steps.

This transformer provides the low-voltage power needed by the appliance's control and user-interface circuits so systems like the dispenser, ice maker, or control board can operate reliably. What it does:

• Steps down mains power to low-voltage power for control boards and user-interface components
• Restores power to dispensers, ice makers, timers or control modules that have lost low-voltage supply
• Commonly replaced when control circuits are unresponsive, displays are blank, or dispenser functions fail
• Matches OEM function for direct replacement of the failed transformer

• One replacement transformer

• Disconnect all power to the appliance before starting work to avoid shock hazard
• Handle wiring connections carefully; make secure electrical connections and restore grounding

This main damper assembly regulates airflow between compartments to help maintain proper refrigerator temperatures. It replaces a worn or stuck damper to restore controlled air delivery for more consistent cooling performance. What it does:

• Controls the amount of cold air flowing from the freezer into the fresh-food compartment
• Helps stabilize internal temperatures when opening/closing doors or during mode changes
• Commonly fails by sticking open or closed, causing warm fresh-food temps or overcooling
• Works with the refrigerator's control system to modulate airflow based on demand

• Disconnect power before beginning any service to avoid electrical shock
• Handle the damper flap and cable/gear gently to prevent damage during installation
• Inspect surrounding seals and mounting points; secure all fasteners and reconnect any harnesses
• After installation, restore power and verify proper operation across temperature settings

Color: Black

The Outer Door is an OEM part for Whirlpool built-in microwaves. It forms a sturdy outer shell that protects interior electronics and acts as the interface point when accessing the cooking chamber.

Causes of a bad outer door can include dents or cracks developing over time from repeated opening and closing, especially if subjected to excessive force. Surface damage from aggressive cleaning chemicals is also possible. 

Symptoms of a bad outer door include: 

• Gaps that compromise the sealed cooking environment
• Difficulty latching or having the door remain shut securely  
• Scratches, chips, or cracks that ruin the aesthetic
• Restricted access to interior components

Color: Black

Replacing with a genuine Whirlpool outer door ensures a perfectly fitted, long-lasting barrier. Compatible brands include KitchenAid, Jenn-Air, and select Kenmore built-ins.

This motor cover shields the motor assembly and nearby components from debris and accidental contact. Replacing a cracked or missing cover restores proper protection and can reduce noise caused by objects rubbing against moving parts.

• Covers the motor area to block dust, grease, and foreign objects
• Helps secure the motor housing and maintain proper clearances
• Can quiet rattling or scraping caused by a loose or broken cover
• Common signs: cracked, warped, or missing cover; scraping/rattling from the motor area; visible motor exposure

• Disconnect power at the breaker or unplug the appliance before servicing
• Access the motor compartment per your model's service/installation information
• Retain and reuse the original screws/fasteners unless damaged
• Do not overtighten fasteners to avoid cracking the new cover; verify clearances before testing

Color: White