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Error code reference

GE Dishwasher Error Code F59

Thermistor error

GE codesGE dishwasher codes

Thermistor error - thermistor is not functional.

First step from the service manual

Ensure thermistor harness is connected; if connected, measure resistance across connector J1102 pins 1 (RW) to 2 (WN). Replace heater assembly or heater top if faulty.

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

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What F59 means on a GE dishwasher

F59 indicates the control board has detected a low out-of-range signal from the dry heater thermistor. The thermistor is a temperature-sensing resistor mounted near the dry heater element; it sends a resistance value to the control board that corresponds to a specific temperature. When that resistance value drops below the expected minimum threshold, the board logs F59 and halts normal operation. This condition typically points to an open circuit in the thermistor itself, a disconnected or damaged wiring harness, or a thermistor that has failed and is producing an implausibly low resistance reading.

For homeowners, think of the dry heater thermistor as the dishwasher's temperature watchdog for the drying cycle. It constantly reports how hot the drying heater is getting. If the control board receives a signal that is too low to make sense, it shuts things down rather than risk the heater operating without proper temperature feedback. This is a protective measure, not a catastrophic failure, and the root cause is often something as simple as a loose connector rather than a failed part.

Start diagnosis at the thermistor harness connector before replacing any components. Unplug the dishwasher, locate the connector at the thermistor, and confirm it is fully seated. Inspect each terminal inside the connector housing for bending, corrosion, or pushed-back pins, as any of these can interrupt the signal and trigger F59.

Source: manufacturer service documentation.

Common causes of F59

  1. 01

    Disconnected or loose thermistor harness connector

    Wiring / connection

    If the wiring harness connector at the dry heater thermistor is not fully seated, the control board reads an open circuit and interprets this as an out-of-range low signal. Reseating the connector fully can clear the error without any part replacement.

  2. 02

    Bent or damaged terminals inside the connector housing

    Wiring / connection

    Individual terminals inside the harness connector can become bent, corroded, or pushed back during installation or over time, breaking the electrical contact between the thermistor and the control board. The connector may appear plugged in while the terminals inside are not making a reliable connection.

  3. 03

    Failed dry heater thermistor

    Part replacement

    The thermistor itself can fail open internally, causing it to output a resistance value that falls below the control board's acceptable range and triggering F59. A multimeter reading across the thermistor terminals that shows infinite or no resistance confirms the part has failed and must be replaced.

  4. 04

    Damaged wiring between thermistor and control board

    Part replacement

    A broken wire, chafed insulation causing a short to ground, or a burned section of the harness between the thermistor and the control board can produce a low or open signal that the board reads as F59. Inspect the full wire run for visible damage before replacing the thermistor itself.

See the test procedure for each cause

Frequently asked questions about F59

What does F59 mean on a GE dishwasher?
F59 on a GE dishwasher means the control board has detected a low out-of-range reading from the dry heater thermistor, which is the temperature sensor for the drying heater. The board is not receiving a signal within the expected resistance range, so it stops the cycle to prevent the heater from running without proper temperature monitoring. The cause can be a loose connector, damaged wiring, or a failed thermistor.
How do I fix F59 on a GE dishwasher?
Start by unplugging the dishwasher and locating the dry heater thermistor harness connector. Disconnect and firmly reseat the connector, then check each terminal inside the housing for bending or corrosion. If the connector and wiring look intact, use a multimeter to test the thermistor's resistance; a reading of infinite resistance means the thermistor has failed open and needs to be replaced. If resistance reads correctly, inspect the wiring harness along its full length for damage before suspecting the control board.
Is it safe to keep using my GE dishwasher when it shows F59?
The dishwasher will typically stop the cycle when F59 is active, so the drying heater is not operating without temperature feedback. Running the machine repeatedly while the error is present is not recommended because the drying function will not work correctly and the underlying electrical fault should be resolved before continued use. The dishwasher is not a fire or flood hazard in this state, but normal operation is compromised until the thermistor circuit is repaired.
How much does it cost to fix a GE dishwasher F59 error?
If the fix is a reseated connector or a straightened terminal, there is no parts cost and only your time is involved. A replacement dry heater thermistor typically costs between $15 and $40 for the part. If a technician is needed, expect a service call fee plus labor, which commonly brings the total to $100 to $200 depending on your area and the specific GE model.
Can a bad control board cause F59 on a GE dishwasher?
A faulty control board can produce F59, but it is the least likely cause and should only be considered after the thermistor, its connector, and the full wiring harness have been tested and confirmed good. Replacing a control board on a GE dishwasher typically costs $150 to $300 for the part alone, so ruling out the thermistor circuit first is essential before committing to that repair.

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