LG Washer Error Code 1SUd

The 1SUd code means the washer has detected excessive foaming in the upper drum compartment. The machine monitors suds levels during the cycle, and when foam exceeds an acceptable threshold, this code is triggered. The washer may pause or extend the cycle to reduce the suds before continuing. The most common cause is too much detergent or a non-HE detergent being used.

The 1SUd error is not a safety hazard, but repeated excessive foaming can stress internal components over time if left unaddressed. The machine is designed to pause and manage the foam automatically, which protects it during the affected cycle. Correcting detergent use promptly will prevent long-term issues.

In most cases there is no repair cost at all, since the fix involves adjusting detergent type or quantity and cleaning the drum. If the error persists after those steps and a faulty sensor is suspected, diagnostic service calls typically range from $75 to $150, with sensor or control board parts adding additional cost depending on the specific component involved.

Start by reducing the amount of detergent you use and confirming it is an HE-rated product. If the error has appeared multiple times, run a tub clean cycle to clear any soap residue from the drum and dispenser. Avoid overloading the upper drum, as this can also trap detergent and cause excess sudsing.

A reset may clear the code temporarily, but the error will return if the underlying cause is not corrected. If too much or the wrong type of detergent was used, the next cycle will likely trigger the code again. Address the detergent issue first, then run a fresh cycle to confirm the problem is resolved.