La Cornue Range Er
La Cornue Range Er is a fault our factory-trained technicians diagnose and repair with genuine parts. Below is what it means, the most likely causes, and the steps to try before booking service.
What Er means on your La Cornue Range
On the electronic controls of a La Cornue dual-fuel or induction range, “Er” (sometimes with a number) flags an internal technical fault the control cannot self-correct. The range stops the affected function and waits for service. It is a general fault flag covering several possible subsystems.
Symptoms to look for
The signs below help confirm you are dealing with this condition rather than a different fault. You may notice just one of them or several together, and they can appear gradually over time or suddenly after a spill, a power event, or recent service.
- “Er” displayed and the affected cooking function stops
- Controls may become unresponsive or erratic
- May follow a power event
- Clears briefly on reset, then returns
Common causes
Several different faults can produce these symptoms. Working through the most likely causes in order helps you separate a quick, inexpensive fix from a problem that needs trained service and the correct La Cornue parts.
- Control board fault — a failed component or out-of-range internal value
- Sensor open/short — a temperature or zone sensor reads invalid
- Harness fault — a loose or damaged connector
- Power event — surge or brownout corrupted the control state
Troubleshooting steps you can try
Work through these checks in order, with the appliance cool and powered down before you touch any internal part. Stop at any point where you are unsure, or where gas, high heat, or live electrical parts are involved, and hand the remaining diagnosis to a qualified technician.
- Power the range down for two minutes, then restore and retry once.
- Record any number following “Er” for the technician.
- Confirm a stable supply and recent outage history.
- If it returns immediately, stop and arrange service.
When to call a technician
A persistent “Er” requires a technician to read the fault, test sensors and harness, and replace the control board if needed. Use the correct proprietary La Cornue control part. You can reach the La Cornue National Service Center on 1-877-522-6768, or find an authorized technician through the manufacturer at lacornueusa.com. La Cornue appliances are hand-built and use proprietary parts, so factory-trained service protects both your warranty and the appliance.
Parts a technician may replace
Depending on what the diagnosis shows, a technician may inspect, test, or replace the control board, sensors, and wiring harness. The correct part for your configuration is identified from the model and serial number; on La Cornue appliances these are proprietary components fitted by trained service rather than generic substitutes, which protects both performance and the appliance’s long-term value.
Safety and prevention
To reduce the chance of this returning on your La Cornue Range, keep up with routine care — clean spills before they bake on, follow the manufacturer’s maintenance schedule, and avoid abrasive pads or harsh chemicals on enamel, brass, and finished surfaces. Protect the electronics with a stable, correctly rated supply, and note any code exactly as displayed before resetting. When you book service, having the model and serial plate details and a note of exactly what you observed will help the visit go quickly.
Need help now? Book a certified technician on our schedule page, explore more La Cornue range error codes, or see full La Cornue range repair options.
