La Cornue Oven Er
La Cornue Oven 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 Oven
On a La Cornue electric or multifunction oven (such as the convection oven in a CornuFé range or the electric vaulted oven in a dual-fuel Château), an “Er” message signals that the electronic control has detected an internal technical fault it cannot self-correct. The control halts heating as a safety measure and waits for service. “Er” is a general fault flag rather than a single specific failure, so it always warrants diagnosis.
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.
- The display shows “Er” (sometimes “Er” followed by a number) and the oven stops heating
- The oven may refuse to start a program, or abort mid-bake
- Controls become unresponsive or behave erratically
- The fault may clear briefly after a power cycle, then return
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 component on the electronic board has failed or detected an out-of-range internal value
- Temperature probe open/short — the oven sensor reads outside its valid window and the board flags the fault
- Wiring harness fault — a loose, chafed, or heat-damaged connector between the probe, element, and board
- Power event — a 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.
- Switch the oven off at the wall or breaker for two minutes, then restore power — a transient glitch can clear this way.
- Note whether any digits follow the “Er” and write them down; this helps the technician identify the subsystem.
- Confirm the oven is on a stable, correctly wired circuit and was not recently affected by a power outage.
- If the code returns immediately on the next program, stop using the oven and arrange service rather than repeatedly resetting.
When to call a technician
A persistent “Er” almost always requires a factory-trained technician to read the fault, test the temperature probe and harness, and replace the control board if it has failed. Probe and board access on the vaulted/multifunction oven requires careful disassembly. 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 electronic control board, temperature probe, 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
Keep up with routine care and prompt professional servicing; catching a developing fault early keeps the repair simpler and protects this hand-built appliance.
Need help now? Book a certified technician on our schedule page, explore more La Cornue oven error codes, or see full La Cornue oven repair options.
