mypros+
Error code reference

GE Dishwasher Error Code F9

Turbidity sensor reading low.

GE codesGE dishwasher codes

Turbidity sensor reading low.

First step from the service manual

Check turbidity sensor harness, replace sensor.

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

MyPros+ Max

Get the full diagnostic procedure for F9.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What F9 means on a GE dishwasher

The F9 error code on a GE dishwasher indicates that the turbidity sensor is returning a reading that is lower than expected. The turbidity sensor is responsible for measuring the clarity of the water inside the dishwasher tub during the wash cycle. It does this by emitting an infrared beam through the water and measuring how much light reaches the receiver. When water is dirty or loaded with food particles, the sensor detects reduced light transmission and signals the control board to adjust the cycle accordingly. A low reading suggests the sensor is not detecting the expected amount of particulate matter, or more commonly, that the sensor itself is not functioning correctly.

The most frequent trigger for this fault is a problem in the wiring harness connecting the turbidity sensor to the main control board. Loose connectors, corroded terminals, or damaged wires can interrupt the signal and cause the control board to interpret the input as abnormally low. The sensor itself can also fail internally, producing an out-of-range output voltage or resistance that the control board flags as an error.

Diagnosing the F9 code begins with a physical inspection of the turbidity sensor harness, checking for any signs of moisture intrusion, pinched wires, or disconnected plugs. If the harness checks out, the sensor should be tested for proper output and replaced if it is found to be defective. Continuing to run the dishwasher with this fault active may result in the control board making incorrect wash cycle decisions, potentially leaving dishes poorly cleaned.

Source: manufacturer service documentation.

Common causes of F9

  1. 01

    Loose or damaged wiring harness

    Wiring / connection

    The harness connecting the turbidity sensor to the control board may have a loose plug, corroded terminal, or broken wire. Inspect the connector at both the sensor and control board ends for any visible damage or poor seating.

  2. 02

    Failed turbidity sensor

    Part replacement

    The turbidity sensor itself may have failed internally and is producing an out-of-range signal. If the harness checks out, the sensor should be tested and replaced if it does not meet specification.

  3. 03

    Contaminated or blocked sensor lens

    Wiring / connection

    Grease, mineral deposits, or debris coating the sensor lens can interfere with its infrared beam and cause abnormal readings. Clean the sensor lens and retest before replacing the component.

  4. 04

    Moisture intrusion into the connector

    Wiring / connection

    Water infiltration into the wiring connector can cause corrosion or short the signal circuit, resulting in a low turbidity reading. Look for water staining or greenish corrosion on the terminals.

  5. 05

    Faulty main control board

    Part replacement

    If the sensor and harness both test correctly, the control board may be misreading the sensor input. This is the least common cause and should only be considered after ruling out all other possibilities.

See the test procedure for each cause

Frequently asked questions about F9

What does F9 mean on a GE dishwasher?
F9 on a GE dishwasher means the turbidity sensor has reported a reading that is lower than expected. The turbidity sensor monitors how cloudy or dirty the wash water is during the cycle. This error typically points to a faulty sensor or a problem with the wiring harness that connects it to the control board.
Can I fix the F9 error on my GE dishwasher myself?
A knowledgeable DIYer can start by inspecting the turbidity sensor harness for loose connectors or visible damage and cleaning the sensor lens. If those steps do not resolve the fault, replacing the turbidity sensor is the next step. Working on internal dishwasher components requires disconnecting power first, and anyone uncomfortable with electrical components should call a qualified technician.
Is it safe to keep using my GE dishwasher with an F9 error?
Running the dishwasher with an active F9 error is not recommended. Without accurate turbidity sensor data, the control board cannot properly regulate the wash cycle, which can result in poor cleaning performance. It is best to address the fault before continuing regular use.
Will resetting my GE dishwasher clear the F9 error code?
Resetting the dishwasher may temporarily clear the F9 code, but the error will return if the underlying problem with the turbidity sensor or its wiring has not been fixed. A reset is useful for confirming the fault is repeatable, but it is not a repair. The sensor or harness must be inspected and corrected to permanently resolve the code.
How much does it cost to repair a GE dishwasher F9 error?
Repair costs depend on what component needs to be replaced. A turbidity sensor part typically falls in the range of $20 to $60, and if you hire a technician, labor charges can bring the total to somewhere between $100 and $250 depending on your location and the service provider. If the main control board turns out to be the cause, costs will be higher.

Related GE dishwasher codes

All GE dishwasher codes
View all 222 GE dishwasher codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass