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Error code reference

GE Dishwasher Error Code F16

Communication error with UI board.

GE codesGE dishwasher codes

Communication error with UI board.

First step from the service manual

Verify harness connections between UI board and MC board.

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

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  • 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
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What F16 means on a GE dishwasher

The F16 error code on a GE dishwasher indicates the control board has detected water temperature exceeding the expected upper threshold during a wash or rinse cycle. This reading comes through the thermistor, a temperature-sensing resistor mounted in the wash tub or sump. When the thermistor reports a temperature above the programmed limit, the board triggers F16 and typically halts the cycle as a protective measure. The first diagnostic path is the thermistor itself, its wiring harness, and the connectors linking it to the control board.

For homeowners, this error means your dishwasher thinks the water inside is too hot. The most likely culprit is a faulty thermistor that is sending a false high-temperature reading rather than the water actually being dangerously hot. A damaged wire or loose connector between the thermistor and the control board can produce the same incorrect reading. In some cases, the incoming hot water supply or the heating element could be contributing to a genuine overtemperature condition.

Before replacing any parts, visually inspect the thermistor connector and harness for corrosion, pinched wires, or loose terminals. A multimeter check of the thermistor's resistance against the temperature chart in the service manual will confirm whether the sensor is reading accurately or has failed.

Source: manufacturer service documentation.

Common causes of F16

  1. 01

    Failed thermistor

    Part replacement

    The thermistor itself has drifted out of spec or shorted internally, causing it to report falsely high temperature values to the control board. This is the most common trigger for F16 and can be confirmed by measuring the thermistor's resistance with a multimeter and comparing it to the manufacturer's resistance-temperature table.

  2. 02

    Damaged or corroded wiring harness

    Part replacement

    Corrosion, a pinched wire, or a chafed insulation point in the harness running to the thermistor can create resistance or a short that mimics a high-temperature signal. Inspect the full length of the harness for visible damage, especially near routing clips or sharp metal edges.

  3. 03

    Loose or corroded thermistor connector

    Wiring / connection

    A poor connection at the thermistor plug or at the control board header can cause intermittent or fixed false readings. Disconnecting, cleaning with electrical contact cleaner, and firmly reseating the connector sometimes resolves the error without any part replacement.

  4. 04

    Heating element staying on too long

    Part replacement

    If the heating element relay on the control board is sticking closed, the element can continue heating past the target temperature, producing a genuine overtemperature condition that correctly triggers F16. This scenario typically accompanies other heating-related symptoms and usually requires control board or element replacement.

See the test procedure for each cause

Frequently asked questions about F16

What does the F16 error code mean on a GE dishwasher?
F16 means the control board has detected a high water temperature condition based on the signal from the thermistor. This can be caused by a faulty thermistor sending a false reading, damaged wiring, a bad connector, or in rarer cases, the heating element genuinely overheating the water. Checking the thermistor and its harness first will identify the cause in most cases.
How do I fix the F16 error code on my GE dishwasher?
Start by unplugging the dishwasher and locating the thermistor in the sump or tub area. Inspect the wiring harness and connectors for corrosion or damage, disconnect and reseat the connector, then test the thermistor's resistance with a multimeter against the temperature curve in your model's service manual. If the thermistor is out of spec, replace it. If the harness is damaged, repair or replace the affected section. If the error persists after those steps, the control board may need evaluation by a technician.
Is it safe to keep using my GE dishwasher when the F16 code is showing?
Running the dishwasher while F16 is active is not advisable. If the error reflects a real overtemperature condition rather than a bad sensor, continued operation could damage dish racks, plastic components, or the heating circuit. Most GE dishwashers will halt the cycle when F16 is triggered, which is the intended protective response. Resolve the fault before resuming normal use.
How much does it cost to repair a GE dishwasher F16 error?
If the fix is a loose or corroded connector, the cost is zero beyond your time. A replacement thermistor typically costs between $15 and $40 for the part. A wiring harness repair or replacement may run $20 to $60 in parts. If the control board is causing the heating element to overheat, board replacement can range from $100 to $250 or more depending on the model. Adding a service call from a technician generally adds $80 to $150 in labor.
Can a bad thermistor cause a false F16 code on a GE dishwasher?
Yes, a failed thermistor is the most common reason for F16 appearing when the water is not actually overheating. Thermistors can drift out of their correct resistance range or develop an internal short that makes the control board read an artificially high temperature. Testing resistance with a multimeter at a known water temperature and comparing the reading to the spec chart in the service manual will confirm whether the sensor is faulty.

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