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Error code reference

GE Dishwasher Error Code Boost

Thermistor error

GE codesGE dishwasher codes

Thermistor error – Control detecting short or open circuit at thermistor.

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What Boost means on a GE dishwasher

The Boost error code on a GE dishwasher indicates a thermistor fault, specifically that the control board has detected either a short circuit or an open circuit at the thermistor sensor. The thermistor is a temperature-sensing resistor whose resistance value changes predictably with temperature. The control board continuously monitors this resistance to track water temperature during the wash and dry cycles. When the resistance reading falls outside the expected range, either dropping too low (indicating a short) or going too high or reading no signal at all (indicating an open circuit), the control triggers the Boost fault and typically halts normal operation.

Thermistor faults generally stem from one of three areas: the thermistor component itself has failed, the wiring harness connecting the thermistor to the control board has been damaged, or the control board's input circuit for the thermistor has malfunctioned. Wiring issues such as corroded connectors, pinched wires, or broken solder joints are common culprits, especially in older units exposed to repeated heat and moisture cycles. A failed thermistor, where the resistive element has degraded internally, is also a frequent cause.

Diagnosing this fault requires a multimeter to measure the resistance across the thermistor terminals. A reading near zero ohms points to a short, while an infinite or open reading confirms an open circuit. Wiring continuity checks between the thermistor and the control board connector should also be performed to rule out harness faults before replacing either component.

Source: manufacturer service documentation.

Common causes of Boost

  1. 01

    Failed thermistor

    Part replacement

    The thermistor's internal resistive element has degraded or burned out, causing it to send an incorrect signal to the control board. Testing with a multimeter will show a resistance reading that is either near zero or infinite, confirming the component has failed.

  2. 02

    Corroded or damaged wiring harness connector

    Wiring / connection

    Repeated exposure to heat and moisture inside the dishwasher can corrode the connector pins or damage the wires between the thermistor and the control board. Visually inspecting the harness for corrosion, breaks, or burn marks can help identify this issue.

  3. 03

    Broken or pinched wire

    Wiring / connection

    A wire in the thermistor circuit may have been pinched during installation or worn through over time, creating an open or intermittent short circuit. A continuity test along the full length of the wiring run will reveal any breaks.

  4. 04

    Loose or disconnected harness plug

    Wiring / connection

    The connector at the thermistor or at the control board may have worked itself loose, interrupting the circuit. Checking that all connectors are fully seated and locked is an important first step before deeper diagnosis.

  5. 05

    Faulty control board

    Part replacement

    If the thermistor and all wiring test within normal parameters, the control board's thermistor input circuit may have failed. This is the least common cause and should only be considered after ruling out the sensor and wiring.

See the test procedure for each cause

Frequently asked questions about Boost

What does Boost mean on a GE dishwasher?
The Boost error on a GE dishwasher signals a thermistor fault, meaning the control board has detected either a short circuit or an open circuit at the temperature sensor. The thermistor monitors water temperature throughout the wash and dry cycles, and when its resistance reading falls outside the expected range, the control board triggers this code. The dishwasher will typically stop operating normally until the fault is resolved.
Can I fix the Boost error on my GE dishwasher myself?
A knowledgeable DIYer with a multimeter can diagnose this fault by testing the thermistor resistance and checking wiring harness continuity. If the issue is a loose connector or a visibly damaged wire, the repair may be straightforward. Replacing the thermistor itself is also a manageable repair, but if the control board is found to be faulty, that replacement is more involved and may warrant professional service.
Is it safe to use my GE dishwasher when the Boost error is showing?
It is not recommended to continue using the dishwasher while the Boost error is active. The thermistor controls temperature monitoring during wash and dry cycles, and without accurate readings the dishwasher cannot properly regulate water temperature. Running the unit in this state could result in poor cleaning performance or, in some cases, overheating.
Will resetting my GE dishwasher clear the Boost error?
A reset may temporarily clear the error code, but if the underlying thermistor fault still exists, the Boost code will return once the control board runs its diagnostic checks again. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and repairing the actual cause.
How much does it cost to repair a GE dishwasher Boost thermistor error?
If the thermistor itself needs replacement, parts typically cost in the range of $15 to $50 depending on the specific model. If the control board is at fault, parts costs are generally in the range of $100 to $250 or more. Adding professional labor for diagnosis and repair can bring the total to anywhere from $100 to $350 or higher, depending on the technician and the parts required.

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