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Step-by-Step Guide for Detecting and Addressing the SUD Error Code on LG Washing Machines

Technically Reviewed by Oleg Chudnovski on Nov 06, 2025 | Written by Spark Service PRO Editorial Contributors

LG washing machines are known for their cutting-edge technology. Yet users may encounter occasional challenges. One of the most common issues is the SUD error code, indicating excessive suds during a wash cycle. This guide is dedicated to covering the following topics: exploring when the SUD error occurs, identifying the components responsible, and providing effective solutions to resolve this issue.

When does the SUD Error Code Take Place

The SUD error code typically occurs when the washing machine detects an excessive amount of suds in the drum during a wash cycle.

This overflow of suds can impede the machine's proper functioning, leading to cycle interruptions and triggering the SUD error.

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Parts Involved in the SUD Error Code Occurrence

Knowing the components associated with the SUD error is essential for troubleshooting. They include:

• Detergent Dispenser: The detergent dispenser is responsible for releasing the appropriate amount of detergent into the washing machine. Overfilling or using the wrong type of detergent can lead to excessive sudsing.
• Pressure Switch: The pressure switch monitors the water level in the drum. If the suds build up and create excessive foam, the pressure switch signals the SUD error to prevent potential damage to the washing machine.

How to Fix the SUD Error on the LG Washer

Resolving the SUD error code involves a systematic approach to address the root causes of excessive suds. In order to do this, follow the next steps:

Use High-Efficiency (HE) Detergent:

• Ensure that you are using a detergent specifically designed for high-efficiency washing machines. Using regular detergent can lead to excess sudsing and trigger the SUD error.

Check Detergent Quantity:

• Review the detergent quantity used per load. Follow the manufacturer's guidelines and avoid overloading the detergent dispenser. Adjust the amount of detergent based on the load size and soil level.

Run an Extra Rinse Cycle:

• If you notice excessive suds during a cycle, pause the machine and run an additional rinse cycle. This helps to remove excess detergent from the clothes and reduces the likelihood of suds build-up.

Clean the Detergent Dispenser:

• Regularly clean the detergent dispenser to prevent residue buildup. Remove any clogs or blockages that may hinder the proper dispensing of detergent.

Inspect for Detergent Residue:

• Check the drum and door seal for any detergent residue. Clean these areas to ensure there is no lingering detergent that could contribute to excessive sudsing.

Run a Tub Clean Cycle:

• Periodically run a tub clean cycle using a washing machine cleaner. This helps remove detergent residues and prevents the formation of mould or mildew in the drum.

Summary of LG Washer SUD Error

The SUD error on LG washing machines is often associated with excessive suds during the wash cycle. By using the correct detergent, adjusting detergent quantities as needed, and keeping the detergent dispenser clean, you can ensure smooth operation and optimal performance of your LG appliances.

If you still have questions, you may contact our authorized LG washer repair technicians. In Toronto, appliance repair will be performed by specialists as soon as possible after the service request form is received.