Cooktop High Severity
F3 Appliance Error Code

La Cornue Cooktop F3 Error: Gas Valve Fault

La cornue cooktop f3 error: Overview La cornue cooktop f3 error — this page covers the causes, symptoms, safe checks, and repair-cost guidance drawn from La Cornue owner documentation and certified service records. Understanding the F3 Error The F3 gas valve fault on La Cornue cooktops means the electronic gas valve for a burner zone […]

By Sarah Mitchell Senior Appliance Repair Specialist & Technical Writer

~5%

DIY Fixable

From $350

Typical Repair Cost

2–3 hrs

Pro Repair Time

Quick Assessment

Answer to continue safely

Is it safe to keep using?

No. A gas valve fault is a safety-critical issue. Do not use the affected burner. If the valve is stuck open and will not close, treat it as an emergency and shut off the gas supply to the cooktop.

Can I reset the code?

Yes. A power cycle may clear a transient F3 caused by a board communication glitch. If the valve itself is faulty, F3 will return when the burner is next selected.

When to stop immediately?

Stop if you notice: If you smell gas with no visible flame, immediately shut off the main gas supply valve., If a burner cannot be extinguished, turn off gas at the supply and call emergency services if the smell is strong..

Symptoms You May Notice

Burner will not turn on or off

The affected burner either refuses to ignite despite correct control inputs, or in rare cases, cannot be extinguished via the control knob.

F3 on the display panel

The control panel displays F3 when a burner is selected, preventing gas flow to the zone.

Clicking continues without flame

The igniter sparks continuously but no gas reaches the burner because the valve is not opening.

Gas flow inconsistent

Flame height fluctuates erratically or the burner extinguishes suddenly during cooking due to intermittent valve operation.

Possible Causes

1

Failed solenoid valve coil

The electromagnetic coil inside the gas valve has burned out, preventing the valve from receiving its open or close command.

Requires Professional
2

Valve seat contamination

Debris or corrosion on the valve seat prevents it from sealing or opening fully.

Requires Professional
3

Control board output failure

The board circuit driving the valve solenoid has failed, and the valve itself may be functional.

Requires Professional

Safe Checks You Can Do

These checks are safe for homeowners. No disassembly required. Do not remove panels or access internal components.
  1. 1

    Power cycle the cooktop

    Disconnect cooktop power for 5 minutes. This allows the control board to reinitialize valve driver circuits.

    A transient board fault can latch a valve fault — a full power cycle may clear it.

  2. 2

    Test all other burners

    Try each burner zone individually to determine if F3 is isolated to one valve or affects multiple zones.

    Multiple zones showing F3 suggests a board supply fault rather than individual valve failure.

  3. 3

    Check for gas supply

    Confirm the main gas supply valve to the cooktop is fully open and other gas appliances in the home work normally.

    A low gas supply pressure can cause valve faults on high-end electronic cooktops.

When to Call a Professional

Contact a qualified technician if:

  • Gas valve solenoid coil resistance must be tested to confirm failure.
  • Valve replacement on La Cornue cooktops requires gas line disconnection and certification.
  • After any gas valve repair, the system must be leak-tested before returning to service.

Need Professional Help?

Find qualified technicians in your area for proper diagnostics and repair.

Cooktop Repair Service Schedule Appointment

More Cooktop Error Codes

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E3 E0 E1 F5 F6 F4 F1 F2