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Error code reference

Dacor Dishwasher Error Code F9

Heater failure; temperature does not increase.

Dacor codesDacor dishwasher codes

Heater failure; temperature does not increase.

First step from the service manual

See component diagnosis section for troubleshooting.

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

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What F9 means on a Dacor dishwasher

The F9 error code on a Dacor dishwasher indicates a heater failure, specifically that the water temperature is not increasing as expected during a wash or sanitize cycle. The dishwasher's control board monitors temperature through a thermistor or temperature sensor and expects the heating element to raise water temperature within a defined time window. When the temperature fails to reach the target threshold, the control board registers F9 and halts the cycle to prevent ineffective washing or potential damage.

The heating element is the most common component responsible for this fault. It is a resistive element submerged in the sump area that directly heats the water. A failed or open-circuit heating element will produce no heat at all. The thermistor or temperature sensor is the second key component: if it has drifted out of calibration or failed, it may report incorrect temperatures to the control board even when the heater is functioning normally, triggering a false F9 code.

Wiring and electrical supply issues can also cause this code. A loose or corroded connector at the heating element or sensor, a blown thermal fuse, or an interruption in the circuit between the control board and heater can all prevent the temperature from rising as expected. The control board itself can be responsible if it is failing to supply voltage to the heating element circuit. Diagnosis should include verifying continuity of the heating element, checking resistance of the temperature sensor, inspecting wiring harnesses for damage, and confirming proper voltage delivery from the control board.

Source: manufacturer service documentation.

Common causes of F9

  1. 01

    Failed heating element

    Part replacement

    The heating element has burned out or developed an open circuit, preventing it from generating heat. Check for continuity across the element terminals; a reading of no continuity confirms failure.

  2. 02

    Faulty thermistor or temperature sensor

    Part replacement

    The temperature sensor may have failed or drifted out of range, causing the control board to receive inaccurate temperature readings. Testing the sensor's resistance at a known temperature and comparing it to the specified value will confirm whether it needs replacement.

  3. 03

    Wiring harness or connector damage

    Wiring / connection

    Corroded, loose, or damaged connectors at the heating element or temperature sensor can interrupt the circuit and mimic a heater failure. Inspect all related connectors and wiring for signs of burning, corrosion, or disconnection.

  4. 04

    Blown thermal fuse

    Part replacement

    A thermal fuse in the heater circuit may have opened due to an overheat event, cutting power to the heating element. Test the thermal fuse for continuity to determine if it has failed.

  5. 05

    Control board failure

    Part replacement

    If the control board is not supplying voltage to the heating element circuit, the element cannot operate regardless of its condition. This is typically diagnosed after all other components have been confirmed functional.

See the test procedure for each cause

Frequently asked questions about F9

What does F9 mean on a Dacor dishwasher?
The F9 code on a Dacor dishwasher signals a heater failure, meaning the appliance detected that water temperature did not increase as required during a cycle. The control board monitors temperature continuously and triggers this code when the heating system fails to reach its target. Common culprits include the heating element, temperature sensor, wiring, or the control board itself.
Can I fix the F9 error on my Dacor dishwasher myself?
Some causes of the F9 error, such as a loose connector or minor wiring issue, can be addressed by a knowledgeable DIYer comfortable working with appliance electrical components. However, replacing the heating element, thermistor, or control board requires disassembly of the dishwasher and basic electrical testing skills. If you are not confident working around electrical components, it is best to contact a qualified appliance technician.
Is it safe to keep using my Dacor dishwasher when F9 is displayed?
You should not continue running the dishwasher while F9 is active. The appliance will not heat water to the proper temperature, meaning dishes will not be adequately cleaned or sanitized. In some cases the cycle may stop on its own, but continued attempts to run it without resolving the fault could place additional stress on other components.
How much does it cost to repair a Dacor dishwasher with an F9 error?
Repair costs depend on which component has failed. A replacement heating element typically ranges from $50 to $150 for the part, while a thermistor or temperature sensor is generally less expensive. Control board replacements are the most costly, often ranging from $150 to $400 or more for the part alone. Adding professional labor costs will increase the total, generally ranging from $100 to $200 depending on your location and the complexity of the repair.
Will resetting my Dacor dishwasher clear the F9 error code?
Resetting the dishwasher by cutting power may temporarily clear the F9 code, but it will return as soon as the appliance runs a cycle and the heating fault is detected again. A reset does not fix the underlying problem. Proper diagnosis and repair of the failed component are required to permanently resolve the error.

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