La Cornue Cooktop F2 Error: Flame Sensor Malfunction
La cornue cooktop f2 error: Overview La cornue cooktop f2 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 F2 Error The F2 flame sensor malfunction error on La Cornue cooktops means the thermocouple safety probe cannot confirm that […]
~10%
DIY Fixable
From $220
Typical Repair Cost
1–2 hrs
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. A faulty flame sensor means the gas safety cutoff cannot confirm that a flame is present. Do not use the affected burner until the sensor is repaired or replaced.
Can I reset the code?
No. F2 will recur each time the burner is lit because the underlying sensor fault remains. Cleaning may resolve a contamination-based F2, but a degraded probe requires replacement.
When to stop immediately?
Stop if you notice: Do not attempt to defeat the gas safety cutoff — if the flame sensor is faulty, the gas can flow unburned., If you smell gas after the burner cuts out, ventilate the area and do not use the cooktop..
Symptoms You May Notice
Burner lights then immediately shuts off
The flame appears briefly after ignition but the gas cuts out within one to three seconds as the sensor fails to confirm flame presence.
F2 code after burner extinction
The error code appears immediately after the gas valve closes, cutting off the flame.
Repeated relighting attempts fail
Attempting to relight the burner produces the same cycle of brief flame followed by cutoff and F2.
Other burners operate normally
The F2 fault is isolated to a single burner zone while remaining burners function correctly.
Possible Causes
Contaminated thermocouple probe
Grease or food residue on the flame sensing probe prevents it from generating the correct millivoltage signal.
DIY PossibleDegraded thermocouple element
The thermocouple has aged and no longer produces adequate voltage when heated by the flame, requiring replacement.
Requires ProfessionalWiring fault to sensor
The connection between the thermocouple and the control board has corroded or broken, interrupting the signal.
Requires ProfessionalSafe Checks You Can Do
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1
Clean the thermocouple probe
With the cooktop completely cool, locate the small metal probe near the burner and gently clean it with fine steel wool or a dry cloth.
The thermocouple is the thin metal rod positioned in the path of the burner flame — handle it gently to avoid bending.
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2
Inspect probe positioning
Ensure the thermocouple tip sits correctly in the flame path — it should be positioned where the burner flame makes direct contact.
A probe that has been bent away from the flame zone cannot sense heat even if it is functional.
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3
Power cycle the control board
Disconnect the cooktop from power for 2 minutes, then reconnect and test the burner.
A transient electronic fault can sometimes cause F2 without a physical sensor problem.
When to Call a Professional
Contact a qualified technician if:
- Thermocouple output must be measured in millivolts to confirm failure threshold.
- Replacement thermocouples must be matched to the specific La Cornue burner model.
- Gas valve interlock testing requires a licensed technician to verify safe operation after repair.
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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