LG CordZero Robot Error Codes - Complete Troubleshooting Guide

Your LG CordZero robot stopped cleaning and shows an error code on the display or flashes a light pattern you don't recognize.

LG uses alphanumeric error codes (E1-E9, P1-P5) combined with LED indicators and voice alerts. 79% of LG errors clear in under 10 minutes with the right fix.

Works for all LG CordZero robot models: R9 (R9MASTER), R5 (R5MASTER), A9 ThinQ, CordZero ThinQ series.

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Quick Error Finder

• E1-E3: Wheel & Motor Issues
• E4-E6: Brush & Suction Issues
• E7-E9: Sensor & Navigation
• P1-P5: Power & Battery Issues
• LED Patterns: Light Indicators

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E1-E3: Wheel & Motor Issues

E1: Left Wheel Stuck

Voice: "Left wheel is stuck"

Fix:

1. Flip robot over
2. Locate left drive wheel
3. Remove hair wrapped around wheel and axle
4. Spin wheel manually—should rotate freely
5. Clean wheel housing with dry cloth
6. Reinstall if wheel was removable (pull-out design on R9)

Time: 4 minutes | Success Rate: 89%

E2: Right Wheel Stuck

Voice: "Right wheel is stuck"

Fix: Same as E1, but for right wheel.

Time: 4 minutes | Success Rate: 89%

E3: Drive Motor Error

Voice: "Drive motor error"

Fix:

1. Power off robot completely
2. Check both wheels for obstructions
3. Clean wheel axles thoroughly
4. Wait 5 minutes, power back on
5. If persists: Motor may need service

Time: 6 minutes | Success Rate: 72%

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E4-E6: Brush & Suction Issues

E4: Main Brush Stuck

Voice: "Main brush is stuck"

Fix:

1. Press brush release lever (varies by model)
2. Remove main brush roller
3. Cut and remove ALL tangled hair
4. Clean brush bearing ends
5. Check brush motor shaft for debris
6. Reinstall brush until clicks

LG-Specific: R9 uses dual counter-rotating brushes—check BOTH.

Time: 6 minutes | Success Rate: 85%

E5: Side Brush Error

Voice: "Side brush error"

Fix:

1. Remove side brush (pull straight off or unscrew)
2. Clear hair from brush and mounting post
3. Inspect brush for damage (bent bristles = replace)
4. Reinstall firmly

Time: 3 minutes | Success Rate: 91%

E6: Suction Motor Error

Voice: "Suction motor error" or "Clean the dustbin"

Fix:

1. Remove and empty dustbin completely
2. Clean filter (tap against hard surface)
3. Check suction inlet for blockages
4. Inspect dustbin seal (rubber gasket)
5. Reinstall dustbin, ensure clicks into place

Time: 5 minutes | Success Rate: 78%

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E7-E9: Sensor & Navigation Issues

E7: Cliff Sensor Error

Voice: "Cliff sensor error"

Fix:

1. Flip robot over
2. Locate 4 cliff sensors (small windows on bottom edge)
3. Wipe each sensor with dry microfiber cloth
4. Check for scratches on sensor windows
5. Ensure robot isn't on extremely dark or reflective surface

Time: 3 minutes | Success Rate: 88%

E8: Bumper Stuck

Voice: "Bumper is stuck"

Fix:

1. Press bumper firmly around entire perimeter
2. Check for debris under bumper edge
3. Remove any stuck objects
4. Bumper should spring back smoothly
5. Clean bumper sensors (small windows in bumper)

Time: 2 minutes | Success Rate: 93%

E9: Camera/LiDAR Error

Voice: "Camera error" or "Navigation error"

Fix:

1. Clean camera lens (top front of robot) with microfiber
2. For R9: Clean 3D dual camera array
3. Check for bright lights pointing at camera
4. Move robot to different starting location
5. Delete maps and remap if problem persists

Time: 5-15 minutes | Success Rate: 74%

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P1-P5: Power & Battery Issues

P1: Low Battery

Voice: "Battery low, returning to charging station"

Note: Normal behavior—not an error. Robot will resume after charging.

P2: Battery Overheat

Voice: "Battery too hot"

Fix:

1. Let robot cool for 30 minutes
2. Move charging dock away from heat sources
3. Ensure ventilation slots aren't blocked
4. Resume cleaning after cooldown

Time: 30 minutes (cooling) | Success Rate: 95%

P3: Charging Error

Voice: "Charging error"

Fix:

1. Clean charging contacts on robot (bottom rear)
2. Clean charging dock contacts
3. Check dock has power (LED lit)
4. Try different power outlet
5. Remove and reseat robot on dock

Time: 5 minutes | Success Rate: 82%

P4: Battery Error

Voice: "Battery error"

Fix:

1. Power off robot
2. Remove battery (if user-accessible)
3. Check battery contacts for corrosion
4. Reinstall battery firmly
5. If error persists: Battery may need replacement

Time: 5 minutes | Success Rate: 65%

P5: Power System Error

Voice: "Please contact LG service"

Action: This indicates internal power system failure. Contact LG Support: 1-800-243-0000

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LED Indicator Patterns

Solid Green

Meaning: Charging complete, ready to clean Action: No action needed

Blinking Green

Meaning: Charging in progress Action: Wait for charge to complete

Solid Orange

Meaning: Standby mode or low battery Action: Place on dock to charge

Blinking Orange

Meaning: Error present—check app for code Action: Open LG ThinQ app for details

Solid Red

Meaning: Critical error or battery depleted Action: Check error code, charge immediately

Blinking Red

Meaning: Robot stuck or needs attention Action: Check surroundings, clear obstacles

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Factory Reset (Last Resort)

If errors persist after all troubleshooting:

1. Power off robot
2. Hold Home + Start buttons simultaneously for 10 seconds
3. Robot will beep and reset
4. Reconnect to LG ThinQ app
5. Remap your home

Warning: Factory reset deletes all maps and settings.

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Prevent Errors

• 🔧 After Every Clean: Empty dustbin, check brushes
• 🔧 Weekly: Clean all sensors (cliff, bumper, camera)
• 🔧 Bi-Weekly: Remove hair from wheels and brushes
• 🔧 Monthly: Deep clean filters, check battery health

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Common Questions

How do I check my LG robot's error history?

Open LG ThinQ app → Select your robot → Activity Log. Shows recent cleaning sessions and any errors encountered with timestamps.

Why does my LG R9 keep showing camera errors?

R9's dual camera system is sensitive to bright light and highly reflective surfaces. Avoid starting in direct sunlight, cover large mirrors temporarily, and clean camera lenses weekly.

Can I use my LG robot without the app?

Yes, use the buttons on top of the robot. However, you'll lose scheduling, zone cleaning, error details, and firmware updates. Basic cleaning still works.

How long do LG robot vacuum batteries last?

Typical battery lifespan is 2-3 years with daily use, or 400-500 charge cycles. If runtime drops below 50% of original, consider battery replacement (~$80-120).

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Written by the RoboFixHub Technical Team

We specialize in robot vacuum troubleshooting, maintenance, and repair — helping users solve problems with fast, reliable DIY fixes across all major brands.