Cooktop or range display shows 'Err' when attempting to set temperature or timer

Safety first: Ensure burners and oven are off before resetting controls.

• Clear input: Press the Cancel or Stop key to clear the current program. Wait a few seconds and re‑enter the desired settings following the sequence in the La Cornue user manual.
• Power cycle: Turn the circuit breaker OFF for 2–3 minutes, then back ON to reset the control logic.
• Check keypad response: Test each key. If one area of the touch panel does not respond or triggers 'Err' repeatedly, the keypad membrane may be failing.
• Stabilize power: If the error appears after lights dim or during heavy household load, have an electrician check the supply voltage and connections to the range.
• Replace control if persistent: If 'Err' persists with correct operation and stable power, the electronic control board may need replacement.