GE Dishwasher Error Code LOCK LED illuminated + continuous beeping (Factory Test Mode)

This alert indicates that the turbidity sensor check failed during the dishwasher's factory test mode sequence. The turbidity sensor monitors wash water clarity so the control module can adjust cycle times. When this check does not pass, the LOCK LED lights up and continuous beeping begins to alert the user or technician. The control module, wiring harness, and turbidity sensor are all suspect components.

A basic reset may clear the active alert temporarily, but if the turbidity sensor, wiring, or control module has a genuine fault, the error will return when factory test mode is run again or when the dishwasher cycles through its diagnostics. A lasting fix requires identifying and correcting the underlying hardware problem.

Repair costs vary depending on which component has failed. A turbidity sensor replacement is generally the least expensive fix, with parts typically ranging from $20 to $60 and labor costs additional if a technician is involved. A control module replacement is the most expensive scenario, with parts alone often ranging from $100 to $250 or more depending on the model. Having a technician diagnose the specific failed component first can prevent unnecessary parts costs.

Press any button on the keypad to immediately stop the continuous beeping. This pauses the alarm but does not resolve the underlying fault. After silencing the alert, the turbidity sensor, connecting wiring, and control module should be inspected and tested to find the root cause.

This error code originates in factory test mode rather than during a normal wash cycle, so the immediate safety risk is low. However, a failed turbidity sensor means the dishwasher cannot properly monitor water clarity, which may affect wash performance and water usage. It is best to have the fault addressed before relying on the appliance for regular use.