GE Dishwasher Error Code Wash Boost

The Wash Boost error on a GE dishwasher indicates the control board has detected a short or open circuit at the thermistor, which is the component that monitors water temperature. Without a valid temperature signal, the dishwasher cannot properly regulate the wash cycle. Diagnosis involves checking resistance at connector J3 and comparing it to the thermistor chart. If the reading is out of range, the flood switch assembly, which contains the thermistor, needs to be replaced.

It is not recommended to continue running the dishwasher while this error is active. The thermistor provides the temperature data the control board uses to regulate water heating, and operating without a valid reading could result in improper wash temperatures or the control board shutting down the cycle mid-run. Address the fault before resuming normal use.

A reset may temporarily clear the error code, but if the underlying thermistor fault is still present, the code will return once the dishwasher attempts to run a cycle. Resetting is useful for ruling out a one-time control glitch, but a persistent Wash Boost error requires physical inspection and testing of the thermistor, wiring, and connector at J3.

A knowledgeable DIYer can inspect the wiring harness and reseat the connector at J3 without special tools. However, confirming a thermistor fault requires a multimeter and access to the thermistor resistance chart for your specific model. If resistance at J3 is out of spec, the flood switch assembly will need to be replaced, which involves disconnecting power and accessing internal components.

If the repair only requires reseating or cleaning the connector at J3, cost is minimal. If the flood switch assembly needs replacement, parts typically range from $30 to $80 depending on the model, and professional labor can add $80 to $150 or more. A control board replacement, if needed, is a more expensive repair that could range from $150 to $300 or higher in parts alone.