What does the code mean SUD?
Sud appears when the washer detects excess foam and runs a suds-reducing routine that can add about two hours per LG references; if suds persist during spin, the washer may stop.
Code meanings can vary by model, market and appliance type. Always check your model's user manual. The same letters can mean something different on dishwashers or refrigerators.
Related symptoms
- Very long cycle
- Visible foam at the door
- Detergent residue on clothes
Possible causes
- Non-HE detergent
- Too much detergent
- Clothes carrying residue from earlier washes
Safe checks you can do
- Use HE detergent at the correct dose
- Run an extra rinse without detergent
- Clean the detergent drawer
If Sud appears even with correct detergent doses.
When do you need a technician?
The technician checks the pressure sensor, draining and cycle behaviour.
Related error codes
FAQ
Is Sud a fault?
Usually not—it's protection against excess foam.
How do I prevent Sud?
Use less detergent and an HE-type product.
Related guides
LG Washer Not Cleaning Well: Detergent, Load Size and Program Choice
Clothes still dirty or covered in residue after an LG wash? Program, detergent and load choices, hard water and heating—and when it's actually a fault.
LG Wash Cycle Taking Longer Than Usual: Why Does Time Increase?
Why your LG washer cycle runs long or the timer stalls: rebalancing, suds, low water pressure, heating and smart programs that adjust time.
The code meaning was reviewed against these public LG support pages: