LG Washer Error Code DC1

DC1 is a door check error indicating the washer's main PCB cannot confirm the door is properly locked. It can be caused by a loose or damaged door lock switch terminal, wiring with insulation leakage, pressure pushing the door open during a boil wash, or a faulty main PCB. The washer stops operation as a safety precaution whenever this signal is lost.

A reset may temporarily clear the DC1 code, but if the underlying cause is a damaged door lock switch, broken terminal, or faulty wiring, the error will return as soon as the next cycle begins. A reset is worth attempting first, particularly if the error appeared during a high-temperature wash where pressure may have briefly pushed the door ajar. If the code returns consistently, a physical inspection of the door lock assembly and wiring is necessary.

Repair costs vary depending on the root cause. If only the terminal connector needs reseating or the wiring needs minor repair, costs may be minimal, primarily covering a service call in the range of $75 to $150. Replacing a door lock switch unit typically costs between $80 and $200 including parts and labor. A main PCB replacement is the most expensive outcome, generally ranging from $200 to $500 or more depending on the model.

Start by checking whether the door lock switch unit is fully inserted and undamaged, as a loose or broken terminal is the most common cause. Inspect the wiring harness between the door lock and the PCB for any visible damage. If the error appeared after a hot or boil wash cycle, wait for the machine to cool and check whether the door reseats correctly before assuming a component has failed.

No, you should not continue running the washer while DC1 is active. The error indicates the control system cannot confirm the door is secured, which means the door could potentially open during a cycle and cause water damage or injury. The washer is designed to halt operation specifically to prevent this risk.