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Error code reference

Fisher & Paykel Dishwasher Error Code F4

No temperature increase has been recorded when the element is on, possibly due to element not connected…

Fisher & Paykel codesFisher & Paykel dishwasher codes

No temperature increase has been recorded when the element is on, possibly due to element not connected, element open circuit, or temperature sensor/electronics ADC failure.

First step from the service manual

Check if the element heats in diagnostics; if no, test the resistance of the element at the controller as per specifications.

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

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What F4 means on a Fisher & Paykel dishwasher

The F4 error code on a Fisher & Paykel dishwasher indicates that the control system detected no temperature increase during a wash or rinse cycle when the heating element was commanded on. The dishwasher monitors water temperature through a sensor and expects to see a measurable rise within a defined period. When that rise does not occur, the controller logs F4 and halts the cycle to prevent damage and ensure proper sanitation performance.

The three primary causes the system points to are: the element not being electrically connected (loose or burnt terminal), an open circuit within the element itself (a break in the resistance wire), or a failure in the temperature sensing circuit, which includes the thermistor or the analog-to-digital converter (ADC) on the main controller board. An open-circuit element will read infinite resistance rather than the specified ohm value when tested at the controller terminals. A failed thermistor may report incorrect or flat temperature readings even if the element is functioning normally.

Diagnosis should begin by running the element in the dishwasher's built-in diagnostics mode and observing whether it activates. If the element does not heat during diagnostics, resistance testing at the controller connector is the next step. A properly functioning element will show a specific resistance value within the range documented for the model. Readings of infinite resistance or zero ohms both indicate element failure. If element resistance checks out correctly, the fault path shifts to the thermistor and the controller board's ADC circuitry.

Source: manufacturer service documentation.

Common causes of F4

  1. 01

    Open circuit heating element

    Part replacement

    The resistance wire inside the heating element has broken, preventing current flow and heat generation. Testing the element's resistance at the controller terminals will show infinite resistance rather than the specified value for your model.

  2. 02

    Disconnected or burnt element terminal

    Wiring / connection

    The wiring connection at one or both of the element's terminals has come loose or burned through, interrupting the circuit without the element itself being faulty. Inspect the terminal connections at the element and trace the wiring back toward the controller for damage or corrosion.

  3. 03

    Failed temperature sensor (thermistor)

    Part replacement

    The thermistor responsible for reporting water temperature to the controller has failed or is sending a flat, unchanging signal, causing the controller to believe no heating is occurring even if the element is working. A faulty thermistor will typically show out-of-range resistance or no change in reading as temperature changes.

  4. 04

    Controller board ADC failure

    Part replacement

    The analog-to-digital converter circuit on the main controller board processes the thermistor signal into a usable temperature reading. If this circuit fails, the controller cannot detect temperature changes and will trigger F4 even with a functional element and sensor.

See the test procedure for each cause

Frequently asked questions about F4

What does F4 mean on a Fisher & Paykel dishwasher?
F4 means the dishwasher's control system turned on the heating element but detected no rise in water temperature during the cycle. This points to a problem with the heating element, its wiring connections, the temperature sensor, or the controller board's temperature-reading circuit. The dishwasher stops the cycle when this fault is detected to prevent washing in water that has not reached the proper temperature.
Can I fix F4 on my Fisher & Paykel dishwasher myself?
Some steps are accessible to a confident DIYer, such as checking and reseating wiring connections at the heating element terminals. However, resistance testing at the controller connector and diagnosing thermistor or board-level faults requires a multimeter and comfort working with electrical components. Replacing the heating element or controller board is moderately complex and involves disconnecting power and accessing internal components, so those steps are best handled by a qualified technician if you are unsure.
Is it safe to use my dishwasher when it shows F4?
You should not continue running the dishwasher with an active F4 fault. The dishwasher is not heating water to the temperatures needed for effective cleaning and sanitation, and running cycles in this state will produce poor results. Additionally, if the fault is related to a wiring or connection issue, continued use without inspection could pose an electrical risk.
Will resetting my Fisher & Paykel dishwasher clear the F4 error?
A reset may temporarily clear the fault code, but F4 will return as soon as the dishwasher attempts a cycle and again detects no temperature increase. The underlying issue with the heating element, wiring, thermistor, or controller board must be diagnosed and repaired for the error to be permanently resolved.
How much does it cost to repair a Fisher & Paykel dishwasher showing F4?
Repair costs depend on which component has failed. A heating element replacement typically falls in the range of $80 to $200 including parts and labor, while thermistor replacement is generally less expensive. If the main controller board requires replacement, costs can range from $150 to $350 or more. Getting a diagnosis first is the best way to understand the full cost before committing to a repair.

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