LG LRMVS3006S (French Door) – Smart diagnosis errors Repair Guide

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🔧 Smart diagnosis errors Repair Guide for LG LRMVS3006S (French Door)

💡 Don’t panic! Run diagnostics; check control board and sensor connections

📋 What You’ll Need

  • Control board
  • Sensor kit

🔧 Step-by-Step Repair Instructions

🔧 Step 1: Run smart diagnosis mode

  1. Locate your smartphone and ensure it has the LG ThinQ app installed and your refrigerator registered, OR prepare to use the audible tone method with LG’s customer service line at 1-800-243-0000.
  2. Open both refrigerator doors fully to access the control panel, located on the ceiling of the fresh food compartment, approximately 2 inches from the front edge.
  3. Press and hold the “Refrigerator” and “Ice Plus” buttons simultaneously for 3 seconds until you hear a single chime sound.
  4. Watch the display panel – the temperature readings will disappear and be replaced by “SmartDiagnosis” or blinking indicators, confirming diagnostic mode is active.
  5. If using the app method: Open LG ThinQ app, select your refrigerator model, tap “Smart Diagnosis,” then tap “Start Smart Diagnosis” and follow the on-screen countdown (typically 10 seconds).
  6. Position your smartphone’s microphone within 1 inch of the control panel speaker grille (small perforated section on the right side of the control panel).
  7. Press the “Freezer” button once to start the diagnostic tone transmission – you’ll hear a series of beeps and data tones lasting approximately 6-10 seconds.
  8. Keep the phone stationary until the transmission completes and the app displays “Diagnosis Complete” with error codes, or if calling customer service, maintain phone position until the representative confirms they’ve received the full transmission.
  9. Record any error codes displayed – they appear as two-letter codes (like “Er dH” or “Er FF”) on the control panel or in the app.
  10. Exit diagnostic mode by pressing and holding “Refrigerator” and “Ice Plus” buttons simultaneously for 3 seconds again, or simply unplug the refrigerator for 10 seconds then plug back in.
  11. The display will return to normal temperature readings when diagnostic mode has successfully exited.

🛠️ Step 2: Check control board connections

  1. Locate the main control board inside the refrigerator compartment at the top right corner, approximately 2 inches from the right wall and 4 inches back from the front edge of the ceiling.
  2. Remove the control board cover by pressing the two plastic tabs on the front edge downward while pulling the cover forward and down. The cover measures approximately 8 inches wide by 4 inches deep.
  3. Identify the main control board—a green rectangular circuit board measuring approximately 6 inches by 3 inches with multiple wire harness connectors attached.
  4. Examine connector CN1 (white plastic connector with 8 wires, located on the left side of the board). Press the locking tab down with your index finger and pull the connector straight out from the board socket using a rocking motion.
  5. Inspect the metal pins inside both the connector and board socket for any corrosion, discoloration, or bent pins. The pins should be shiny silver and aligned straight.
  6. Push connector CN1 back into its socket until you hear and feel a distinct click. The locking tab should snap upward into the locked position.
  7. Locate connector CN2 (black plastic connector with 6 wires, center position on the board). Squeeze the side release tabs together and pull straight out.
  8. Check for any blackened or melted plastic around the terminals. The plastic should be uniform black with no brown or white discoloration.
  9. Reinsert CN2 firmly until the side tabs click into place on both sides.
  10. Examine connector CN3 (white connector with 4 wires, right side of board). Depress the top locking lever and disconnect.
  11. Verify all wire terminals inside the connector are fully crimped onto their wires by gently tugging each wire. None should pull free.
  12. Reconnect CN3 until the locking lever clicks upward.
  13. Reinstall the control board cover by aligning the rear tabs first, then pressing the front edge upward until both front tabs snap into place.

⚙️ Step 3: Test sensor readings

  1. Set your digital multimeter to DC voltage mode, 20V range.
  2. Locate the defrost sensor on the evaporator coil in the freezer compartment – it’s a small white or blue cylindrical component, approximately 1 inch long, attached to the refrigerant tubing with a metal clip on the left side of the evaporator.
  3. Trace the two wires (typically white and brown) from the defrost sensor to the wire harness connector located 8 inches below the sensor.
  4. Disconnect the 2-pin white plastic connector by pressing the locking tab on top and pulling the halves apart.
  5. Touch the black multimeter probe to the brown wire terminal and the red probe to the white wire terminal on the sensor side of the connector.
  6. Record the voltage reading – it should display between 0.5V and 3.5V at normal freezer temperature (0°F to -10°F).
  7. Locate the refrigerator temperature sensor on the right interior wall, 14 inches from the top, behind a small white plastic housing secured by 1 Phillips-head screw.
  8. Remove the Phillips-head screw using a #2 screwdriver and pull the housing straight out.
  9. Disconnect the 2-pin connector (white and red wires) from the sensor by squeezing the sides of the connector.
  10. Set your multimeter to resistance (ohms) mode, 20K range.
  11. Touch the multimeter probes to both metal terminals on the sensor itself – polarity doesn’t matter for resistance testing.
  12. The reading should display between 4,000-6,000 ohms at 40°F refrigerator temperature, or 8,000-12,000 ohms if the compartment is warmer than 50°F.
  13. Write down both readings – defrost sensor voltage and refrigerator sensor resistance – for comparison with diagnostic values in Step 4.

🔩 Step 4: Reset smart features

  1. Locate the control panel on the inside of the refrigerator’s fresh food section, positioned on the ceiling approximately 2 inches back from the door frame, centered left to right.
  2. Press and hold the “Settings” button (marked with a gear icon) for 3 seconds until the display screen illuminates with a menu.
  3. Use the down arrow button to scroll through the menu options until “Wi-Fi” appears on the display screen.
  4. Press the “OK” button (center button on the control pad) to enter the Wi-Fi settings submenu.
  5. Scroll down using the arrow button until you see “Reset Connection” displayed on the screen.
  6. Press “OK” to select Reset Connection—the screen will display “Resetting…” for 5-10 seconds.
  7. Wait for the display to show “Reset Complete” with a checkmark icon, indicating the Wi-Fi module has been cleared.
  8. Press and hold both the “Refrigerator” and “Freezer” temperature buttons simultaneously (located on the left and right sides of the control panel) for 5 seconds to perform a full smart diagnostics reset.
  9. Watch for the display to cycle through a sequence showing “—” dashes on all temperature displays, then return to normal temperature readings (refrigerator 37°F, freezer 0°F).
  10. Navigate back to the main menu by pressing the “Settings” button once, then scroll to “Smart Diagnosis” using the arrow buttons.
  11. Press “OK” on Smart Diagnosis—the display will show “Ready” with a speaker icon, confirming the smart features have successfully reset and are ready for reconnection.
  12. Exit the settings menu by pressing the “Settings” button one final time, returning to the standard temperature display screen.

📋 Step 5: Replace control board if needed

  1. Locate the main control board behind the front panel at the top center of the refrigerator compartment, directly below the ice maker housing.
  2. Identify the control board – a green or black circuit board approximately 6 inches wide by 4 inches tall, enclosed in a clear plastic cover.
  3. Remove the plastic cover by pressing the two side tabs inward simultaneously and lifting the cover straight up and off.
  4. Take a clear photo of all wire harness connections before disconnecting – this board typically has 6-8 multi-wire connectors in different colors.
  5. Disconnect each wire harness connector by pressing the locking tab on top of each connector with your thumb while pulling the connector straight out from the board – you’ll feel each one release with slight resistance.
  6. Remove the 4 Phillips-head screws (using a #2 Phillips screwdriver) securing the control board to the mounting bracket – two screws at the top edge and two at the bottom, spaced approximately 3 inches apart.
  7. Lift the old control board straight up and out of the mounting bracket.
  8. Position the new replacement control board (part number EBR85303303) into the mounting bracket, aligning the four screw holes.
  9. Install the 4 Phillips-head screws finger-tight, then tighten each one-quarter turn more – do not over-tighten as the plastic mounting points can crack.
  10. Reconnect each wire harness connector to its corresponding port on the new board, matching wire colors and connector shapes from your reference photo – each connector will click audibly when fully seated.
  11. Verify all connectors are firmly attached by gently tugging on each wire bundle – properly connected harnesses will not pull free.
  12. Snap the plastic cover back onto the control board by aligning the bottom edge first, then pressing down on the top until both side tabs click into place.

⚠️ 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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🛒 Recommended Products

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