GE Dishwasher Error Code Continuous beep + Lock LED

This alert indicates a Factory Test Mode calibration failure. The dishwasher's control board ran self-checks on the temperature sensor, the turbidity sensor, and the EEPROM memory, and at least one of those checks failed. The temperature sensor must read between 42°F and 199°F, the turbidity sensor's analog signal must fall within an expected range, and the EEPROM must be readable for the calibration to pass.

The dishwasher is alerting you that a critical calibration check has failed, meaning it cannot confirm sensor readings are reliable. It is best not to run cycles until the fault is resolved, as the turbidity and temperature sensors directly influence wash cycle decisions. Continued use with a failed sensor could result in inadequate cleaning or improper water temperatures.

If the fix is simply cleaning the turbidity sensor, costs are minimal, typically just the price of citric acid crystals or vinegar. Replacing a temperature sensor or turbidity sensor generally runs in the range of $20 to $80 for the part, plus labor if a technician is involved. A control board replacement, needed in cases of EEPROM failure, is the most expensive repair and can range from $100 to $300 or more depending on the model and labor rates.

Start by cleaning the turbidity sensor using vinegar or citric acid crystals (WD35X151), as sensor contamination is the most common cause. Also check whether the dishwasher is installed against a non-insulated exterior wall, since cold temperatures can push the sensor reading below the 42°F minimum. If cleaning and location checks do not resolve the issue, further diagnosis of the temperature sensor or control board will be needed.

A power reset may temporarily clear the display, but if the underlying cause such as a contaminated sensor, low ambient temperature, or a faulty component is still present, the error will return when the self-test runs again. The calibration failure must be addressed at the source to prevent the alert from recurring.