Asko D5894XXLFI – Turbidity sensor dirty Repair Guide

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Asko D5894XXLFI – Turbidity sensor dirty Repair Guide

Model: Asko D5894XXLFI
Brand: Asko
Model Number: D5894XXLFI

🔍 Problem Description

Clean sensor; run cleaning cycle; recalibrate if needed

📋 What You’ll Need

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  • Turbidity sensor
  • Cleaning tools

    • 🔧 Step-by-Step Repair Instructions

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    1. Locate and clean Turbidity sensor

      2. 🔧 Step 1: Run dishwasher cleaning cycle

      1. Open the dishwasher door fully until it rests at approximately 45 degrees from vertical.
      2. Remove all dishes, utensils, and racks from inside the dishwasher compartment.
      3. Inspect the bottom of the dishwasher tub for any large food debris, broken glass, or objects – remove anything you find by hand.
      4. Locate the cylindrical filter assembly in the center bottom of the tub (typically 4-6 inches in diameter).
      5. Twist the filter counterclockwise one-quarter turn and lift straight up to remove it.
      6. Rinse the filter under running tap water for 30 seconds, using your fingers to dislodge any trapped particles from the mesh screen.
      7. Reinsert the filter into its housing, press down firmly, and twist clockwise one-quarter turn until it stops rotating.
      8. Locate the spray arm at the bottom of the tub – it’s the propeller-shaped component with small holes.
      9. Spin the spray arm by hand – it should rotate freely with no grinding or resistance.
      10. Place one dishwasher cleaning tablet or pour 2 cups of white vinegar directly into the bottom of the empty tub (not in the detergent dispenser).
      11. Close the dishwasher door until you hear it latch completely.
      12. Press the power button on the control panel to turn on the unit.
      13. Select the hottest, longest wash cycle available – typically labeled “Heavy,” “Pots & Pans,” or “Sanitize” (usually 2-3 hours duration).
      14. Press “Start” or “Begin” to initiate the cycle.
      15. Wait for the cycle to complete – you’ll hear the dishwasher stop running and may see an indicator light change or hear a completion beep.
      16. Open the door 2 inches and let the interior air-dry for 1 hour before proceeding to the next repair step.

      🛠️ Step 2: Recalibrate sensor per manual instructions

      1. Press and hold the “Control Lock” button (top right of control panel) for 5 seconds until you hear two beeps and see “CAL” appear on the display.
      2. Release the button when the display shows “CAL” flashing and “00” on the right side.
      3. Press the “Start” button once – the display will change to show “SEN” and a number between 0-9.
      4. Remove all items from inside the appliance cavity and close the door fully until it clicks.
      5. Press the “+” button three times to set the display to “03” – this initiates the sensor test cycle.
      6. Press “Start” button – you’ll hear a single beep and the display will show “RUN” for approximately 4 minutes.
      7. Watch for the display to change from “RUN” to “END” with a corresponding three-beep pattern.
      8. When “END” appears, press the “-” button twice – the display will show a two-digit code representing the sensor reading (should read between 15-25 for proper calibration).
      9. If the number shows 14 or lower, or 26 or higher, press “Control Lock” for 3 seconds to exit, wait 10 minutes, then repeat steps 1-8.
      10. If the reading is between 15-25, press “Start” to save the calibration – you’ll hear four confirmation beeps.
      11. Press “Control Lock” for 3 seconds to exit calibration mode – the display will return to normal clock or standby mode.
      12. Place a cup of room-temperature water (approximately 70°F) on the center of the cavity floor.
      13. Run a 30-second sensor cycle – the appliance should recognize the item and complete without error codes.

      ⚙️ Step 3: Test sensor operation

      1. Set your multimeter to the ohms (Ω) setting at 20K range by rotating the dial clockwise to the Ω symbol.
      2. Touch the two multimeter probes together and verify the display reads 0.0 or close to zero, confirming the meter works properly.
      3. Locate the sensor’s wire connector—you’ll see 2 wires (typically white and brown) leading to a plastic connector housing approximately 0.5 inches wide.
      4. Insert the red multimeter probe into the left terminal of the connector where the white wire connects.
      5. Insert the black multimeter probe into the right terminal where the brown wire connects.
      6. Read the multimeter display at room temperature (68-72°F). You should see a reading between 50,000 and 60,000 ohms (50-60 on the 20K scale).
      7. Fill a glass with ice water and submerge the sensor tip (the metal probe end) for 60 seconds while keeping the connector dry.
      8. Watch the multimeter reading change. At 32°F (ice water temperature), the resistance should climb to 85,000-95,000 ohms.
      9. Remove the sensor from ice water and use a hair dryer on medium heat, holding it 3 inches from the sensor tip for 30 seconds.
      10. Observe the resistance drop. At approximately 100°F, you should see 35,000-45,000 ohms.
      11. If readings fall within these ranges and change smoothly without jumping erratically, the sensor functions correctly—proceed to reinstallation.
      12. If readings show “OL” (overload), stay at zero, or don’t change with temperature, the sensor has failed and requires replacement.
      13. If readings jump randomly (changing by more than 5,000 ohms per second), the internal wiring has degraded and replacement is needed.
      14. Write down your test results: room temperature reading, cold reading, and hot reading for future troubleshooting reference.

      🔩 Step 4: Replace sensor if cleaning and recalibration fail

      1. Unplug the appliance from the wall outlet and wait 5 minutes for residual electrical charge to dissipate.
      2. Locate the sensor mounting bracket—you’ll see 2 Phillips-head screws (typically #2 size) securing the sensor to the mounting surface, spaced approximately 1.5 inches apart.
      3. Remove both mounting screws by turning counterclockwise, placing them in a small container to prevent loss.
      4. Identify the wire connector attached to the back of the sensor—this will be a rectangular plastic connector housing 2 to 4 wires (commonly red and black, or red, black, and white).
      5. Press the locking tab on the connector housing (located on the top or side edge) with your thumb while pulling the connector straight away from the sensor terminals—you’ll feel it release with light resistance.
      6. Remove the old sensor from its mounting position by sliding it forward and out of any retaining clips or brackets.
      7. Hold the new replacement sensor and verify the connector terminal configuration matches the old unit by counting the metal pins and checking their spacing—they must align exactly.
      8. Position the new sensor into the mounting bracket, aligning the 2 screw holes with the threaded mounting points.
      9. Insert both mounting screws and hand-tighten clockwise until snug, then add 1/4 turn with your screwdriver—do not overtighten, as plastic mounting tabs can crack.
      10. Push the wire connector onto the sensor terminals—align the connector with the pins and press firmly until you hear an audible click, indicating full engagement.
      11. Gently tug the connector with 2-3 pounds of pulling force to verify it’s locked in place—it should not separate.
      12. Plug the appliance back into the wall outlet and run a test cycle to verify the new sensor responds correctly to the measured condition (temperature, moisture, or pressure depending on appliance type).
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