---
title: "Diagnostic visit"
description: "La Cornue diagnostic visit: one visit, one technician, one answer in writing. On a make with three error codes in its entire documentation, the diagnostic is…"
url: "https://la-cornuemiami.support/services/diagnostic-visit/"
date_modified: "2026-09-03"
Appliance type: "Cooktops and rangetops, Ovens, Range hoods, Ranges, Rangetops"
---


# La Cornue diagnostic visit

### About a diagnostic visit on a La Cornue

This make tells you almost nothing about itself. Three error codes exist in the whole of La Cornue's US documentation and all three are on the induction hob, so on a gas Château the visit is the only source of information there is. It opens by reading the range rather than the badge — size, model code and the top configuration, because two ranges with one model number can hold different modules — then measures: gas pressure at the manifold, igniter current, shelf temperature against the dial, supply voltage at the appliance. It ends with numbers, a recommendation and a from-price in writing, and the fee comes off the repair.

What this involves

Measured, not guessed — this make reports almost nothing on its own

The configuration code read off the range, because it decides the parts

Written findings and a from-price before anything is opened

Read the range, not just the badge

Size, model code and the top configuration. A Château 150 in a K3 configuration and the same range in a K6 need different parts for the same complaint.

Hear the history

When it started, whether it was sudden or gradual, what changed in the kitchen. A fuel conversion, a moved range or electrical work upstream explains a large share of these calls.

Measure what can be measured

Gas pressure at the manifold, element resistance, actual shelf temperature against the dial, supply voltage at the appliance. Numbers, in the report.

Separate the design from the problem

A vaulted oven cooks unevenly by design and an H on the induction display means residual heat. Some calls end here, and that answer is worth the visit.

Price it before touching it

Parts, lead time and labor in writing. Nothing is opened, ordered or fitted until it is agreed.

### What should I have ready when I book?

The size and the model code if you have them — G45, T49, C1-I and so on — plus the top configuration code if the paperwork survives, and the finish name. Those four things decide which parts travel with us. Then the ordinary questions: what it is doing, when it started, and whether anything changed in the kitchen recently.

### Where is the data plate on a La Cornue?

On the Château ranges it is usually behind the lower door or on the frame at the side of the oven aperture; on a CornuFé it is on the frame behind the door. Photograph it rather than copying it down. If you cannot find it, the original invoice or the dealer's order confirmation is genuinely more useful on this make than on any other, because it carries the configuration and the finish reference as well.

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