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Error code reference

GE Dryer Error Code t0

Thermistor open

GE codesGE dryer codes

Thermistor open - thermistor voltage is under 0.2 VDC for more than 5 seconds.

First step from the service manual

Check the PCB, wire, and thermistor.

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

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What t0 means on a GE dryer

The t0 error code on a GE dryer indicates that the thermistor circuit has gone open, specifically that the thermistor voltage has dropped below 0.2 VDC and remained there for more than 5 seconds. The thermistor is a temperature-sensing resistor that continuously reports exhaust or drum air temperature to the control board (PCB). When the circuit reads below this voltage threshold, the PCB interprets this as a broken or disconnected circuit rather than a valid temperature reading, and the t0 fault is triggered to prevent uncontrolled heating.

An open thermistor condition typically means the resistance in the sensing circuit has spiked to an extremely high or infinite value, which corresponds to a near-zero voltage signal reaching the PCB. This can result from a failed thermistor component itself, a broken or disconnected wire in the thermistor harness, or a fault on the PCB where the thermistor input circuit has failed. Because the dryer relies on this sensor to regulate heat, it cannot safely operate without a valid temperature signal.

Diagnosing t0 starts with a visual inspection of the wiring between the thermistor and the PCB, checking for pinched, burned, or disconnected connectors. The thermistor itself can be tested with a multimeter for continuity and resistance. A functioning thermistor should show measurable resistance at room temperature rather than an open reading. If wiring and the thermistor both check out, the PCB input circuit should be evaluated as the likely fault source.

Source: manufacturer service documentation.

Common causes of t0

  1. 01

    Failed thermistor

    Part replacement

    The thermistor itself has failed internally and is no longer conducting, producing an open circuit. Testing with a multimeter will show no continuity or an infinite resistance reading.

  2. 02

    Broken or disconnected wiring

    Wiring / connection

    The wire harness connecting the thermistor to the PCB may have a break, a burnt section, or a connector that has come loose. Visually inspecting the harness and checking for continuity through each wire will identify this problem.

  3. 03

    Loose or corroded connector

    Wiring / connection

    Connectors at the thermistor or PCB end can loosen over time or develop corrosion that interrupts the circuit. Unplugging and reseating the connectors, then inspecting the terminals for corrosion or damage, is a key step.

  4. 04

    Faulty PCB

    Part replacement

    If the thermistor and all wiring test correctly, the input circuit on the PCB itself may have failed, causing it to read a falsely low voltage. This is the least common cause but should be considered after other components are ruled out.

See the test procedure for each cause

Frequently asked questions about t0

What does t0 mean on a GE dryer?
The t0 code means the dryer's thermistor circuit has gone open, with the thermistor voltage reading below 0.2 VDC for more than 5 seconds. The thermistor is the temperature sensor that tells the control board how hot the dryer is running. When this signal is lost, the dryer cannot safely regulate heat and will display the fault code. The problem can be in the thermistor itself, the connecting wiring, or the control board.
Can I fix a t0 error on my GE dryer myself?
A knowledgeable DIYer can diagnose and fix this code in many cases. Start by checking the wiring and connectors between the thermistor and the PCB for any visible damage or loose connections. If the thermistor tests open with a multimeter, replacing it is a straightforward repair. If the wiring and thermistor are both good, the PCB may need professional evaluation or replacement.
Will resetting my GE dryer clear the t0 error code?
Resetting the dryer by unplugging it for a few minutes may temporarily clear the code, but if the underlying fault still exists, the t0 error will return once the control board detects the low voltage condition again for more than 5 seconds. A reset is useful for confirming whether the fault is intermittent, but it does not repair a failed thermistor, broken wire, or faulty PCB.
Is it safe to use my GE dryer when it shows a t0 error?
It is not recommended to operate the dryer while this code is active. The thermistor is a critical safety component that prevents overheating by providing temperature feedback to the control board. Without a valid reading, the dryer cannot properly regulate its heating element, which creates a potential fire and safety risk. The dryer should remain out of service until the fault is diagnosed and corrected.
How much does it cost to repair a t0 error on a GE dryer?
Repair costs depend on which component has failed. A replacement thermistor is generally an inexpensive part, with DIY costs typically ranging from $10 to $40 for the part alone. If a professional is needed, labor charges will add to that total. A PCB replacement is significantly more expensive, with parts and labor potentially ranging from $150 to $350 or more depending on the model and service provider.

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