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Error code reference

GE Dishwasher Error Code Wash Boost

Thermistor error

GE codesGE dishwasher codes

Thermistor error - Control is detecting a short or open circuit at the thermistor.

First step from the service manual

Check thermistor resistance at connector J3 pins against thermistor chart; replace flood switch assembly if out of range.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What Wash Boost means on a GE dishwasher

The Wash Boost error code on a GE dishwasher indicates a thermistor fault. Specifically, the control board has detected either a short circuit or an open circuit at the thermistor, which is a temperature-sensing component responsible for monitoring water temperature during the wash cycle. The thermistor feeds real-time temperature data to the control board so the dishwasher can regulate heating and optimize wash performance. When the signal falls outside the expected range, the control flags the fault and may halt or limit operation.

Diagnosis begins at connector J3 on the control board. Technicians should measure thermistor resistance at the J3 pins and compare the reading against the thermistor resistance chart for the specific model. An open circuit typically produces an infinite or very high resistance reading, while a short circuit produces a resistance reading near zero. Both conditions indicate the thermistor is not functioning within its specified parameters.

The thermistor on GE dishwashers is integrated into the flood switch assembly rather than being a standalone component. If resistance measured at J3 falls outside the acceptable range shown on the thermistor chart, the correct repair is to replace the entire flood switch assembly, which includes the thermistor. Wiring harness condition, connector integrity at J3, and any signs of corrosion or water intrusion at the connector should also be inspected before condemning the assembly, as a damaged harness can produce the same fault symptom.

Source: manufacturer service documentation.

Common causes of Wash Boost

  1. 01

    Failed thermistor in the flood switch assembly

    Part replacement

    The thermistor itself has failed internally, producing either an open or short circuit. This is confirmed by resistance readings at connector J3 that fall outside the range shown on the thermistor chart, and the fix is replacing the flood switch assembly.

  2. 02

    Damaged or corroded wiring harness

    Part replacement

    Water intrusion, abrasion, or heat damage to the wiring between the thermistor and the control board can cause an open or short circuit that mimics a failed thermistor. Inspect the harness along its full length for visible damage, pinching, or corrosion at the connector pins.

  3. 03

    Poor connection at connector J3

    Wiring / connection

    Loose, corroded, or improperly seated pins at connector J3 on the control board can interrupt the thermistor signal and trigger this fault. Disconnecting and reseating the connector, then cleaning any corrosion from the pins, may resolve the issue if the harness and thermistor test within spec.

  4. 04

    Control board fault

    Part replacement

    If the thermistor assembly and wiring both test within acceptable resistance values at J3 and the fault persists, the control board itself may be misreading the thermistor signal. Control board replacement would be the next diagnostic step after ruling out the sensor and harness.

See the test procedure for each cause

Frequently asked questions about Wash Boost

What does Wash Boost mean on a GE dishwasher?
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.
Can I fix the Wash Boost error myself on a GE dishwasher?
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.
Is it safe to run my GE dishwasher when the Wash Boost error is showing?
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.
How much does it cost to repair the Wash Boost error on a GE dishwasher?
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.
Will resetting my GE dishwasher clear the Wash Boost error?
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.

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