Kenmore 31633 (Top Load – Whirlpool-made) – Rotor position sensor Repair Guide

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🔩 Rotor position sensor Repair Guide for Kenmore 31633 (Top Load – Whirlpool-made)

💡 Don’t panic! Rotor position sensor on your Kenmore 31633 (Top Load – Whirlpool-made) is a common issue that many DIY enthusiasts can fix themselves. This comprehensive guide will walk you through the repair process step by step.

📋 What You’ll Need

  • Rotor position sensor
  • Sensor cleaning kit
  • Multimeter

    • ⚠️ Safety First

    Before you begin, always:

    • Unplug the washing machine from power
    • Turn off water supply valves
    • Allow the machine to cool down if it was recently running
    • Have a clean, well-lit workspace

      • 🔧 Step-by-Step Repair Instructions

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      🔧 Step 1: Won’t spin or agitate

      1. Unplug the washing machine power cord from the wall outlet completely.
      2. Turn off both hot and cold water supply valves located on the wall behind the machine by rotating them fully clockwise.
      3. Pull the washer away from the wall approximately 3 feet to access the rear panel and create working space.
      4. Open the washer lid and select the “Normal” cycle setting on the control panel.
      5. Close the lid and observe whether you hear any motor humming sounds – listen for 10-15 seconds.
      6. Open the lid again and look inside the drum – press down on the agitator (the center post) with both hands using 15-20 pounds of force, then try rotating it clockwise and counterclockwise.
      7. Note if the agitator rotates freely in both directions (indicates stripped agitator dogs – part #285770), moves slightly with resistance (normal), or doesn’t move at all (indicates drive block or transmission issue).
      8. Grab the inner drum with both hands at the 3 o’clock and 9 o’clock positions and attempt to rotate the entire drum manually.
      9. If the drum rotates freely without resistance, the motor coupling (part #285753A) or drive belt is likely broken.
      10. If the drum doesn’t rotate at all or makes grinding sounds, the transmission or clutch assembly requires inspection.
      11. Locate the model and serial number plate on the back panel, 8-10 inches down from the top edge, centered horizontally – write down these numbers for parts ordering.
      12. Based on your observations: motor humming but no movement indicates a mechanical failure; no sounds at all indicates an electrical or lid switch problem; grinding sounds indicate transmission damage.

      🛠️ Step 2: Clean sensor area

      1. Locate the moisture sensor strips inside the dryer drum – these are two parallel metal bars mounted vertically on the inside front drum wall, positioned 3 inches from the right edge and approximately 8 inches up from the bottom of the drum opening.
      2. Dampen a clean white cloth with white vinegar (not water) and wring it out so it’s moist but not dripping.
      3. Wipe each sensor bar firmly in a vertical motion, making 5-6 passes up and down the full length of each bar. The bars are approximately 4 inches long.
      4. Check for residue buildup – run your fingernail along the sensor surface. You should feel smooth metal, not a waxy or rough coating. If you feel resistance, repeat step 3.
      5. For stubborn buildup, apply undiluted white vinegar directly to a section of the cloth, then scrub the sensors using circular motions with moderate pressure for 15-20 seconds on each bar.
      6. Use a dry section of the cloth to wipe both sensor bars completely dry, removing all vinegar residue.
      7. Inspect the sensor bars under good lighting – they should appear shiny silver metal without white mineral deposits, brown residue, or fabric softener film. The surface should reflect light evenly along the entire length.
      8. Run your dry finger along each sensor bar – it should glide smoothly without catching on buildup or feeling slippery from residue.
      9. Check the drum interior walls within 6 inches surrounding the sensors for lint accumulation. Use the same vinegar-dampened cloth to wipe this area clean.
      10. Verify sensor cleanliness by looking at an angle toward a light source – no hazy film should be visible on the metal bars.

      ⚙️ Step 3: Test sensor operation

      1. Locate the defrost sensor, which is a white cylindrical probe approximately 2 inches long, positioned on the evaporator coil at the rear wall of the freezer compartment, 8 inches up from the bottom and 4 inches left of center.
      2. Set your multimeter to the ohms (Ω) setting at 20K range by rotating the dial clockwise to the ohm symbol.
      3. Touch the black multimeter probe to one terminal of the sensor connector and the red probe to the other terminal – the metal contacts are inside the white plastic connector housing you unplugged in the previous step.
      4. Read the resistance value displayed on the multimeter screen:
      5. If the reading shows “OL” (open loop) or infinite resistance, the sensor has failed and requires replacement (part number 5303918314).
      6. If the reading shows 0 ohms or less than 1,000 ohms, the sensor is shorted and must be replaced.
      7. Fill a glass with ice water and submerge just the sensor probe tip (not the connector) for 90 seconds while keeping the multimeter probes connected.
      8. Watch the resistance reading drop to approximately 16,800 ohms within that 90-second period – this confirms the sensor responds to temperature changes correctly.
      9. If the resistance value does not change or changes erratically (fluctuating more than 500 ohms up and down), replace the sensor.
      10. Remove the sensor from the ice water and dry the probe tip completely with a clean cloth by wiping from connector end toward tip in one direction three times.
      11. Mark the sensor status on your notepad: “PASS” if readings were within range and changed appropriately, or “REPLACE” if any test failed.

      🔩 Step 4: Replace sensor if needed

      1. Locate the defrost sensor, which is a small black cylindrical component approximately 1 inch long with two wire leads, positioned on the evaporator coils behind the back panel in the freezer compartment.
      2. Grip the sensor body firmly between your thumb and forefinger, then pull it straight out from its rubber grommet mounting on the evaporator fins—it requires approximately 3-5 pounds of pulling force to release.
      3. Identify the wire connector approximately 8 inches up from the sensor body—it’s a white plastic two-pin connector measuring roughly 0.5 inches wide.
      4. Press the locking tab on top of the connector with your thumbnail while pulling the two halves apart—you’ll feel a distinct release when the tab disengages.
      5. Remove the old sensor completely and set it aside.
      6. Retrieve your new defrost sensor (Kenmore part number 5303918301 or compatible WR55X10025).
      7. Route the new sensor’s wire leads through the same path as the old sensor, following the wire harness along the left side of the evaporator assembly.
      8. Push the two-pin connector halves together until you hear an audible click—the connector is fully seated when the locking tab snaps into place and you cannot pull it apart without pressing the release tab.
      9. Insert the sensor body into the rubber grommet on the evaporator fins by aligning it with the mounting hole and pushing firmly until the sensor sits flush against the grommet—the sensor should protrude no more than 0.25 inches beyond the grommet surface.
      10. Verify the sensor makes direct contact with the evaporator fin surface by gently wiggling it—there should be no movement or gaps between the sensor tip and the metal fin.

      đź“‹ Step 5: Test motor operation

      1. Locate the motor assembly at the bottom rear of the washer tub, positioned centrally beneath the drum basket.
      2. Identify the motor’s wire harness connector—a white plastic rectangular plug approximately 2 inches wide with 6 wires (typically red, black, white, blue, yellow, and green).
      3. Verify the motor connector remains firmly attached by pressing it until you hear an audible click.
      4. Set your digital multimeter to the resistance (Ω) setting at 200 ohms.
      5. Touch the multimeter’s red probe to the red wire terminal and the black probe to the black wire terminal inside the motor connector. The reading should display between 4-6 ohms resistance for the Kenmore 31633 motor windings.
      6. Move the red probe to the blue wire terminal while keeping the black probe on the black wire. You should see 6-8 ohms resistance.
      7. Touch probes to the yellow and white wires. A reading of 10-15 ohms indicates proper hall sensor operation.
      8. Reconnect the motor wire harness to the control board connector located on the left side panel, 8 inches down from the top edge.
      9. Plug the washer power cord into the wall outlet.
      10. Rotate the control dial to the “Normal Wash” cycle position.
      11. Press the “Start” button and listen for the motor to engage within 3-5 seconds. The drum should begin rotating clockwise at approximately 50 RPM during the initial agitation phase.
      12. Allow the motor to run for 30 seconds, then press “Pause.” The drum should coast to a stop within 5-8 seconds.
      13. Advance the dial to the “Spin” cycle position and press “Start.” The motor should accelerate the drum to high speed (800-900 RPM) within 15-20 seconds, producing a steady humming sound.
      14. Press “Cancel” to stop the test cycle and unplug the power cord from the wall outlet.

      đź’ˇ Pro Tips

      Take photos as you disassemble components – they’ll be invaluable when putting everything back together. If you encounter resistance or something doesn’t seem right, stop and reassess rather than forcing it.

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