How to Fix / Troubleshooting

Safety first: Turn off gas supply and power. Work in a well-ventilated area and avoid sparks or open flames.

Visual inspection: Remove the oven base panel to access the burner and electrode. Check for heavy rust, debris, or food spills blocking the burner ports.
Clean burner and electrode: Gently clean the burner and electrode with a soft brush. Ensure the electrode tip is positioned correctly in the flame path.
Check gas supply: Confirm that the gas shutoff to the oven is open and that other gas burners on the range operate normally.
Test ignition: Restore power and gas, then start an oven cycle. If the burner sparks but does not stay lit, the flame sensor function of the electrode may be faulty; replace the electrode assembly.
Professional service: If F40 persists, a gas-safe technician should check gas pressure, valve operation, and control board flame sensing circuitry.

Do not repeatedly attempt ignition if you smell unburned gas; shut off gas and ventilate immediately.

Falcon dual-fuel range shows F40 and oven gas burner does not light; fan may run.

Possible Causes