Maytag MFI2570FEZ (French Door) – Temperature control problems Repair Guide

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🔧 Temperature control problems Repair Guide for Maytag MFI2570FEZ (French Door)

💡 Don’t panic! Replace main control board; verify thermistor readings

📋 What You’ll Need

  • Main control board
  • Thermistor
  • Multimeter

🔧 Step-by-Step Repair Instructions

🔧 Step 1: Test thermistor readings

  1. Unplug the refrigerator from the wall outlet and wait 5 minutes to allow electrical components to discharge.
  2. Open the refrigerator door and remove all items from the top shelf to access the refrigerator air tower.
  3. Locate the white plastic air tower assembly on the back wall of the fresh food compartment, centered horizontally and extending from top to bottom.
  4. Use a flathead screwdriver (1/4-inch width) to release the two clips at the top of the air tower cover by inserting the screwdriver into the slot and prying outward 1/4 inch.
  5. Pull the air tower cover forward and lift it up to remove it completely, exposing the evaporator fan and thermistor assembly.
  6. Identify the refrigerator thermistor: a small white or gray cylindrical sensor (approximately 1/4 inch diameter, 1 inch long) with two wires attached, located on the right side of the air tower, 8 inches down from the top.
  7. Disconnect the thermistor by pressing the locking tab on the wire harness connector and pulling straight back to separate the connection.
  8. Set your digital multimeter to the resistance (Ohms) setting at 20K ohms range.
  9. Touch the multimeter’s red probe to one thermistor terminal and the black probe to the other terminal (polarity doesn’t matter for resistance testing).
  10. Read the resistance value: at 60°F room temperature, the reading should be between 9,000-11,000 ohms; at 40°F (refrigerator temperature), expect 15,000-17,000 ohms; at 0°F (freezer temperature), expect 30,000-35,000 ohms.
  11. If readings fall outside these ranges by more than 2,000 ohms, the thermistor (part number W10316760) requires replacement.
  12. If readings are within specification, reconnect the wire harness until you hear an audible click, confirming proper connection.

🛠️ Step 2: Check control board operation

  1. Locate the main control board mounted vertically on the upper right interior wall of the refrigerator compartment, approximately 2 inches below the ceiling and 3 inches from the right side wall.
  2. Press any button on the control panel display (temperature up, temperature down, or ice dispenser) and observe whether the display illuminates with numbers or symbols.
  3. Listen for a beep sound when pressing buttons – a functional control board produces an audible confirmation beep within 1 second of button press.
  4. Check the display readout: it should show current temperature settings (typically 37°F for refrigerator, 0°F for freezer) in bright blue LED digits.
  5. Press and hold the “Refrigerator” and “Freezer” buttons simultaneously for 3 seconds to enter diagnostic mode.
  6. Watch the display panel – in diagnostic mode, all LED segments should illuminate fully, showing “88” on both temperature displays and activating all indicator lights (ice maker, water filter, alarm).
  7. Press the “Refrigerator” button once to cycle to error code display – if the screen shows “Er” followed by any numbers (Er dH, Er 1F, Er SH), note these codes as they indicate specific board failures.
  8. If the display remains completely dark with no response to button presses, use a Phillips #2 screwdriver to remove the single screw securing the control panel cover, located at the top center of the panel.
  9. Pull the control panel forward 2 inches to expose the wire harness connector – a white 12-pin rectangular connector attached to the back of the display module.
  10. Inspect the connector for corrosion (green or white deposits), moisture, or burn marks on the plastic housing.
  11. Press the “Light” button and verify the interior LED lights activate – this confirms the board is receiving power through the main harness.

⚙️ Step 3: Verify temperature sensors

  1. Locate the refrigerator air sensor on the upper left side of the fresh food compartment, behind a small white plastic cover approximately 2 inches wide by 1 inch tall, positioned 8 inches from the top and 3 inches from the left wall.
  2. Remove the single Phillips-head screw #2 securing the sensor cover and pull the cover straight off.
  3. Disconnect the white 2-pin connector from the sensor by pressing the small release tab on top and pulling straight out.
  4. Set your digital multimeter to the ohms (Ί) setting at 20K range.
  5. Touch the multimeter probes to both metal pins on the sensor itself (not the wire harness). At 32°F, the reading should be 16,600 ohms. At 68°F (room temperature), expect 5,000 ohms.
  6. Open the freezer door and locate the freezer air sensor on the back wall, centered horizontally, 4 inches down from the top, behind an identical white plastic cover.
  7. Remove the single Phillips-head screw #2 and pull off the cover.
  8. Press the release tab on the white 2-pin connector and disconnect it from the sensor.
  9. Test resistance across the sensor pins with your multimeter. At 0°F, expect 32,560 ohms. At room temperature (68°F), expect 5,000 ohms.
  10. If either sensor reads “OL” (overload/infinite resistance), the sensor has failed and requires replacement (part number WPW10384183).
  11. If readings vary by more than 1,000 ohms from expected values at room temperature, replace that sensor.
  12. If both sensors read within 500 ohms of expected values, reconnect both 2-pin connectors by pushing firmly until they click into position, then reinstall both covers with their screws.

🔩 Step 4: Replace main control board if faulty

  1. Unplug the refrigerator from the wall outlet and wait 5 minutes for capacitors to discharge.
  2. Open the refrigerator door and locate the control panel housing on the ceiling of the fresh food compartment, centered front-to-back.
  3. Remove the 4 Phillips-head screws (#2 bit) securing the control panel cover—two screws at the front edge, two at the rear edge.
  4. Lower the control panel housing 2-3 inches and slide it forward to release the rear mounting tabs.
  5. Identify the main control board—a green circuit board measuring approximately 8 inches by 5 inches with “W10219462” or similar part number printed on it.
  6. Disconnect the wire harness on the left side by squeezing the locking tab with your thumb and index finger while pulling straight out until it separates.
  7. Disconnect the wire harness on the right side using the same squeeze-and-pull method.
  8. Disconnect the smaller white connector at the bottom center of the board by pulling straight down.
  9. Remove 3 quarter-turn screws securing the control board to the mounting bracket by rotating them 90 degrees counterclockwise with a flat-head screwdriver.
  10. Lift the old control board straight up and away from the mounting posts.
  11. Align the new control board’s three mounting holes with the posts on the bracket and press down until it seats flush.
  12. Rotate the 3 quarter-turn screws 90 degrees clockwise until they lock—you’ll feel resistance when fully engaged.
  13. Connect the bottom white connector by pressing straight up until it clicks audibly.
  14. Connect the right-side wire harness by pushing straight in until you hear a click.
  15. Connect the left-side wire harness by pushing straight in until you hear a click.
  16. Position the control panel housing against the ceiling, slide it rearward to engage the mounting tabs, then push upward.
  17. Install the 4 Phillips-head screws and tighten until snug—approximately 8-10 inch-pounds of pressure.

📋 Step 5: Calibrate temperature settings

  1. Locate the control panel at the top of the fresh food compartment, centered on the ceiling approximately 2 inches back from the front edge.
  2. Press and hold the “Refrigerator” and “Freezer” buttons simultaneously for 5 seconds until the display shows “Sb” (Service Board mode).
  3. Release both buttons and wait for the digital display to show the current refrigerator temperature reading.
  4. Place a glass thermometer in a cup of water on the middle shelf, centered front-to-back, approximately 12 inches from the left wall.
  5. Close the refrigerator door and wait 4 hours without opening it.
  6. Open the door, read the thermometer immediately, and note the temperature difference from the display reading.
  7. Press and hold both temperature buttons again for 5 seconds to re-enter Service Board mode.
  8. Press the “Refrigerator” button repeatedly to cycle through adjustment values from -5°F to +5°F in 1-degree increments.
  9. Select the offset value that matches your temperature difference (if thermometer reads 2°F warmer than display, select +2).
  10. Press and hold the “Lock” button for 3 seconds to save the refrigerator calibration setting; the display will flash twice.
  11. Repeat steps 4-10 for the freezer compartment, placing the thermometer in the center of the top freezer basket, 6 inches from the back wall.
  12. After calibrating the freezer, press and hold both temperature buttons for 5 seconds, then press “Freezer” to adjust the offset value.
  13. Press the “Lock” button for 3 seconds to save; the display will flash twice and exit Service Board mode automatically.
  14. Set the refrigerator display to 37°F and freezer display to 0°F using the standard temperature buttons.
  15. Wait 24 hours, then verify temperatures again with the thermometer; readings should match display within 1°F, confirming successful calibration.

⚠️ Safety Reminders

  • Always unplug the refrigerator before beginning any repair work
  • Allow the unit to warm up if working with frozen components
  • Use proper tools and safety equipment
  • If you’re unsure about any step, consult a professional

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