A La Cornue range built to last decades still has parts that drift with age and use, and most of them drift quietly. A vaulted oven’s thermostat can move off calibration well before anyone notices anything beyond “the bread browns differently than it used to.” A burner orifice sized for one gas type slowly reads as a worn burner if the range was ever converted or moved. A hood’s grease filters and fan wheel lose efficiency long before the motor itself fails.
A maintenance visit checks oven temperature against the dial across its range, confirms burner flame quality and gas pressure, and services hood filters and the fan wheel — the handful of checks that catch a small adjustment before it becomes a part that has to be replaced.
