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Error code reference

Fisher & Paykel Cooktop Error Code F8

Wrong flame

Fisher & Paykel codesFisher & Paykel cooktop codes

Wrong flame - Flame detection indicates a flame is present for 20 seconds on a burner that is not operating.

First step from the service manual

Shut the CookSurface off and investigate flame detection circuit.

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

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What F8 means on a Fisher & Paykel cooktop

The F8 error code on a Fisher & Paykel cooktop indicates a "wrong flame" condition, specifically that the flame detection circuit is registering the presence of a flame on a burner that is not currently active or commanded to be on. This detection persists for 20 seconds before the fault is triggered, meaning the control board has confirmed the signal is not a brief transient or spike. The cooktop's flame sensing system typically relies on a thermocouple or flame ionization sensor at each burner position to confirm ignition and monitor burner status. When one of these sensors outputs a signal indicating combustion on a burner the control board did not activate, an F8 fault is logged and the cooktop shuts down as a safety measure.

The most likely root cause is a fault within the flame detection circuit itself, such as a short circuit, damaged wiring, or a faulty thermocouple sending a false positive signal. Contamination from spilled food or grease around a burner's thermocouple can cause erratic sensor output, mimicking the presence of a flame. A cross-connected wiring harness between two burner sensors is another possibility, where one burner's sensor signal is being routed to the wrong input on the control board.

Because this error involves a gas appliance reporting unexpected combustion activity, the cooktop is designed to shut itself off immediately to prevent any unsafe condition. Diagnosis should begin by powering down the unit and carefully inspecting the flame detection circuit, wiring, and individual thermocouples before attempting to restore operation.

Source: manufacturer service documentation.

Common causes of F8

  1. 01

    Faulty thermocouple or flame sensor

    Part replacement

    A defective thermocouple at one of the burner positions can output a false voltage signal, causing the control board to believe a flame is present when none exists. Testing the thermocouple's output at rest should show no appreciable voltage; any reading may indicate a failed sensor.

  2. 02

    Grease or food contamination on the sensor

    Wiring / connection

    Spilled liquids or accumulated grease around the thermocouple tip can create a conductive path or alter the sensor's electrical behavior, producing a misleading flame-present signal. Cleaning the sensor tip and surrounding area carefully may resolve the fault.

  3. 03

    Damaged or shorted wiring in the flame detection circuit

    Part replacement

    Wiring between the burner thermocouples and the control board can become damaged from heat exposure, pinching, or rodent activity, leading to shorts that simulate a flame signal. Inspect the full wiring harness for insulation damage, bare conductors, or melted connectors.

  4. 04

    Cross-connected wiring harness

    Wiring / connection

    If burner sensor wiring connectors have been swapped or incorrectly routed, the control board may receive a signal from an active burner's sensor on an input assigned to a different, inactive burner. This can occur after a previous repair or during installation.

  5. 05

    Failed control board

    Part replacement

    If the flame detection circuit components on the control board itself are defective, the board may misinterpret input signals and trigger an F8 fault even when the sensor and wiring are functioning correctly. A control board fault is typically diagnosed after all sensors and wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about F8

What does F8 mean on a Fisher & Paykel cooktop?
The F8 code indicates that the flame detection system has registered a flame on a burner that is not supposed to be operating, and this condition persisted for 20 seconds. The cooktop shuts itself off automatically when this occurs as a safety precaution. The fault is typically caused by a faulty thermocouple, contaminated sensor, or a problem in the flame detection wiring circuit.
Is it safe to keep using my cooktop after an F8 error?
No, you should not attempt to operate the cooktop after an F8 error until the underlying cause has been identified and corrected. The error involves the gas flame detection system, and continuing to use the appliance before resolving the fault could pose a safety risk. Keep the cooktop powered off and the gas supply shut off until a qualified technician has inspected the unit.
Will resetting the cooktop clear the F8 error code?
Shutting the cooktop off may temporarily clear the display, but the F8 fault will return if the underlying problem in the flame detection circuit has not been fixed. The control board is designed to re-trigger the code after 20 seconds of detecting the wrong flame condition again. A reset alone is not a repair and should not be relied upon as a solution.
How do I fix an F8 error on a Fisher & Paykel cooktop?
Begin by shutting off the cooktop and the gas supply, then inspect the flame detection circuit at the affected burner position. Check the thermocouple for contamination, damage, or incorrect output, and examine all associated wiring for shorts, pinched insulation, or loose connectors. If the sensor and wiring appear intact, the control board may need to be tested or replaced. This diagnosis is best performed by a technician with access to a multimeter and knowledge of gas appliance circuits.
How much does it cost to repair an F8 error on a Fisher & Paykel cooktop?
Repair costs vary depending on the root cause. Cleaning a contaminated thermocouple is essentially free if done as a DIY task, while replacing a faulty thermocouple typically costs between $30 and $80 for the part plus labor. If the control board is the source of the fault, parts and labor combined can range from $150 to $350 or more. Getting a diagnostic assessment from a certified technician will provide a more accurate estimate for your specific situation.

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