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Error code reference

Dacor Range Oven Cooktop Error Code F9

Classic Dishwasher 24": Heater failure

Dacor codesDacor range oven cooktop codes

Classic Dishwasher 24": Heater failure - temperature does not increase.

First step from the service manual

Replace heater; replace WPS; replace control board.

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 range oven cooktop

The F9 error code on a Dacor Classic 24" dishwasher indicates a heater failure condition in which the water temperature fails to rise within the expected timeframe during a wash or heated dry cycle. The control board monitors incoming water temperature through the water pressure switch (WPS) or a dedicated temperature sensor, and when the heating element does not produce a measurable temperature increase, the board interprets this as a heater circuit fault and displays F9 to halt further operation.

The most direct cause is a failed heating element that has developed an open circuit, meaning electrical current can no longer flow through it to generate heat. However, the WPS (water pressure switch) is also implicated because it can affect the control board's ability to confirm proper water fill levels and heating conditions. A faulty WPS may cause the board to incorrectly read the heating cycle status even if the element itself is functional. Control board failure is also a possibility if the relay or circuit responsible for energizing the heater has failed internally.

Diagnosis should follow a sequential replacement approach starting with the heating element, then the WPS, and finally the control board if the fault persists. Before replacing components, technicians should verify that the element is receiving proper voltage during the heat cycle and check element continuity with a multimeter. An open reading on the element confirms it has failed. If the element shows good continuity and correct voltage is present at the element terminals, attention should shift to the WPS and then the control board.

Source: manufacturer service documentation.

Common causes of F9

  1. 01

    Failed heating element

    Part replacement

    The heating element has developed an open circuit and can no longer generate heat. A multimeter check across the element terminals will show no continuity if it has failed.

  2. 02

    Defective water pressure switch (WPS)

    Part replacement

    The WPS provides the control board with information about water conditions during the cycle. A faulty WPS can prevent the board from properly activating or confirming the heating cycle, triggering F9 even if the element is intact.

  3. 03

    Control board heater relay failure

    Part replacement

    The control board contains a relay responsible for sending power to the heating element. If that relay has failed, the element will never receive voltage regardless of its own condition.

  4. 04

    Wiring or connection fault in heater circuit

    Wiring / connection

    Loose, burned, or corroded wiring connections between the control board, WPS, and heating element can interrupt the circuit and cause a temperature rise failure. Inspect all connectors along the heater circuit for damage or corrosion.

See the test procedure for each cause

Frequently asked questions about F9

What does F9 mean on a Dacor range, oven, cooktop?
On a Dacor Classic 24" dishwasher, F9 specifically indicates a heater failure where the water temperature does not increase during the cycle. The control board expects a measurable temperature rise within a set period, and when that does not occur, it triggers F9 and stops the cycle. The fault points to the heating element, the water pressure switch, or the control board itself.
Can I fix the F9 error on my Dacor dishwasher myself?
A knowledgeable DIYer with a multimeter can test the heating element for continuity, which is the first and most likely cause of F9. If the element reads open, replacing it is a straightforward repair. However, if the element tests good and the WPS or control board needs replacement, the job becomes more complex and may be better handled by a qualified technician.
Is it safe to run my Dacor dishwasher with an F9 error?
The dishwasher will generally stop the cycle when F9 appears, so continued operation is unlikely without clearing the fault. Running the unit repeatedly through cycles while the fault is active is not recommended, as dishes will not be sanitized at proper temperatures and underlying electrical faults could worsen over time.
How much does it cost to repair a Dacor F9 dishwasher error?
Repair costs vary depending on the failed component. A replacement heating element typically costs between $40 and $120 in parts, while a water pressure switch may range from $30 to $80. A new control board is the most expensive possibility, often ranging from $150 to $400 or more in parts alone. Adding professional labor will increase the total cost.
Will resetting the Dacor dishwasher clear the F9 error code?
A power reset may temporarily clear the F9 code from the display, but the error will return as soon as the dishwasher runs a cycle and the control board again detects that water temperature is not rising. A reset does not address the underlying component failure, so the fault will persist until the defective part is repaired or replaced.

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