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Error code reference

GE Dishwasher Error Code F33

Low pressure sensor reading

GE codesGE dishwasher codes

Low pressure sensor reading - pressure sensor reading too low during calibration.

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What F33 means on a GE dishwasher

The F33 error code indicates the GE dishwasher's control board has detected an abnormally low reading from the pressure sensor. The pressure sensor monitors water level inside the tub, and when the control board sees a signal that falls below expected thresholds, it triggers F33 and halts normal operation. This can result from a disconnected or damaged wiring harness on the pressure sensor, or from a failed pressure sensor itself.

For homeowners, think of the pressure sensor as the component that tells the dishwasher how much water is in the tub. If the sensor or the wires connected to it are not working correctly, the dishwasher cannot confirm that safe water levels are present, so it stops the cycle and displays F33 to prevent potential problems like running the pump dry. The fix often starts with checking whether the wiring harness is properly seated on the pressure sensor. If the connector is secure and the reading is still low, the pressure sensor itself has likely failed and will need to be replaced.

Source: manufacturer service documentation.

Common causes of F33

  1. 01

    Disconnected wiring harness on pressure sensor

    Wiring / connection

    The connector linking the pressure sensor to the control board can work loose over time due to vibration. A disconnected harness sends no signal or a flatline reading, which the control board interprets as an abnormally low pressure value.

  2. 02

    Damaged or corroded wiring harness

    Part replacement

    If the harness wires are broken, pinched, or corroded at the connector pins, the signal from the pressure sensor will be intermittent or out of range. This can cause F33 even when the sensor itself is functioning correctly.

  3. 03

    Failed pressure sensor

    Part replacement

    The pressure sensor itself can fail internally, causing it to output a signal that reads lower than the control board's minimum acceptable threshold. If the harness checks out and is fully connected, a faulty sensor is the next likely cause.

  4. 04

    Blocked or kinked pressure sensor port or hose

    Wiring / connection

    The small port or hose connecting the pressure sensor to the tub can become clogged with debris or kinked, preventing the sensor from accurately detecting water pressure and causing an artificially low reading.

See the test procedure for each cause

Frequently asked questions about F33

What does F33 mean on a GE dishwasher?
F33 means the control board has detected a low reading from the pressure sensor, which monitors water level inside the tub. The dishwasher stops operation because it cannot verify that the correct amount of water is present. The cause is typically a disconnected wiring harness on the pressure sensor or a failed sensor.
How do I fix the F33 error code on my GE dishwasher?
Start by pulling the dishwasher out enough to access the pressure sensor and check whether its wiring harness connector is fully seated. Press the connector firmly until it clicks into place, then run a cycle to see if F33 clears. If the harness is connected and the error persists, the pressure sensor itself needs to be replaced. A technician can confirm a failed sensor with a multimeter before ordering parts.
Can I still use my GE dishwasher when it shows F33?
Running the dishwasher with an active F33 code is not advisable. The dishwasher cannot accurately monitor the water level in the tub, which means the pump could run dry or the cycle may not complete correctly. Resolve the pressure sensor issue before resuming regular use.
How much does it cost to fix F33 on a GE dishwasher?
If the fix is simply reconnecting a loose wiring harness, there is no parts cost. A replacement GE pressure sensor typically costs between $20 and $60 for the part. If you hire a technician, expect to add $75 to $150 in labor, though the total varies by region and service provider. This is a relatively accessible repair for a confident DIYer who is comfortable disconnecting and reconnecting appliance wiring.
How do I find the pressure sensor on my GE dishwasher to check the harness?
The pressure sensor on most GE dishwashers is located on the lower section of the tub or along the side of the outer cabinet, connected by a small hose to the tub and a wiring harness to the control circuit. You will typically need to remove the lower panel or pull the unit partially out from the cabinet to access it. Consult the wiring diagram on your specific model's service sheet, usually found on the door frame, for the exact location.

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