LG Washer Error Code SUD

Understanding the LG SUD Error on Washers

The LG SUD error (sometimes displayed as SUDS or SUD) appears when the washer detects excessive suds in the drum. Suds accumulate when too much detergent or the wrong type of detergent is used, or when detergent residue builds up over time. Excessive suds interfere with normal wash and drain cycles, can prevent proper rinsing, trigger safety shutdowns, produce longer cycle times, and in extreme cases lead to overflow or poor spin performance. Users often notice a skipped spin, garments coming out wetter than normal, or repeated drain cycles. While the SUD error is typically not immediately dangerous, it can lead to mechanical stress on pumps and seals and may shorten appliance life if ignored.

Common Causes

• Using too much detergent for the load size or soil level
• Using non HE (high efficiency) detergent in a front load or HE washer
• Buildup of soap scum or residue inside the drum, dispenser, or drain hose
• Clogged or partially blocked drain pump or drain hose restricting water flow
• Faulty pressure sensor or water level sensor sending incorrect signals
• Malfunctioning control board that misinterprets sensor data
• Low water temperature preventing detergent from dissolving properly

Troubleshooting Steps

1. Stop the cycle and allow the machine to idle for 10 to 20 minutes to let suds dissipate naturally.
2. Run a rinse and drain or spin only cycle to remove excess suds and water from the drum.
3. Check the detergent type and amount. For HE front loaders, use HE detergent and follow the manufacturer dosing for load size and soil level.
4. Inspect and clean the detergent dispenser drawer. Remove residue, gel, or buildup with warm water and a brush.
5. Examine the drain hose for kinks, clogs, or high spots where suds can collect. Clear any obstructions and ensure proper routing to the standpipe.
6. Clean the drain pump filter or access panel (if your model has one). Remove lint and small items that may restrict flow.
7. Run a tub clean or hot water cleaning cycle with a washer cleaner or 1 cup of white vinegar to dissolve soap scum in the drum and hoses.
8. If SUD persists after cleaning and correct detergent use, test the washer with a small, low-sudsing load and minimal detergent to rule out control board or sensor faults.
9. Check error history on the machine if accessible. If multiple SUD or drain-related faults recorded, consider professional diagnostics for pressure sensor and control board.
10. If you suspect faulty components (drain pump, pressure sensor, control board), power off the washer and contact LG support or a certified appliance technician for repair or replacement.

Maintenance / Prevention Tips

• Always use HE detergent for front load and high efficiency models.
• Measure detergent carefully and follow dosing recommendations on the detergent label.
• Use less detergent for short or lightly soiled cycles.
• Run a monthly tub clean or maintenance wash on hot to remove built-up residue.
• Wipe the drum, door seal, and detergent drawer dry after use to prevent soap buildup and odors.
• Leave the door and dispenser drawer open between loads to promote drying and reduce residue formation.
• Inspect and clean the drain pump filter regularly according to your model manual.
• Avoid liquid fabric softener overdosing which can contribute to residue and suds.
• Use commercial degreaser or washing machine cleaner periodically to dissolve stubborn scum.
• Ensure proper water temperature for dissolving detergent on heavily soiled loads.
• Route drain hose correctly and avoid loops or kinks that trap suds and water.
• Check water hardness and adjust detergent quantity accordingly; hard water can require different detergent strategies.
• Do a quick inspection of the dispenser drawer after each few washes and clean when residue appears.
• Keep small items out of pockets to prevent pump clogs that can worsen SUD issues.
• When switching detergents, run an empty hot rinse to clear residues from the system.

FAQs

What does SUD mean on my LG washer?

SUD means the washer detected excessive suds during operation. It signals the control system to stop or alter the cycle to remove suds and protect the machine.

Will too many suds damage my washer?

Repeated excessive suds can strain the drain pump, seals, and motor and may cause incomplete rinsing, longer cycles, and potential leaks if left unaddressed.

Can I clear the SUD error myself?

Often yes. Stop the cycle, allow suds to subside, run rinse and drain cycles, and adjust detergent use. Clean the dispenser and run a maintenance wash. If the error persists, professional help may be needed.

Is SUD caused by using the wrong detergent?

Yes. Using non HE detergent in an HE washer or overdosing any detergent are common causes. Use the recommended HE detergents and correct dosing.

When should I call a technician?

Call a technician if SUD repeats despite correct detergent use and cleaning, or if you notice unusual noises, persistent drain issues, or electronic errors indicating pump or sensor failure.

Conclusion and Safety Notice

The LG SUD error is usually caused by excessive or inappropriate detergent and is commonly resolved with careful cleaning and correct detergent use. However, recurring suds can indicate clogged drains, failing pumps, or sensor and control board issues. For your safety, always disconnect power before inspecting internal components, avoid DIY repairs beyond simple cleaning unless you have the proper tools and experience, and call a certified appliance technician when electrical parts, pumps, or sensors require testing or replacement. Prompt attention prevents further damage and ensures safe operation.