When a Thermador gas or electric wall oven takes an unusually long time to reach its set temperature (frequently exceeding 15 to 20 minutes), the delay is typically caused by a degrading silicon-carbide igniter or heating element losing electrical continuity and failing to draw sufficient power. Other common culprits include calibration drift in the internal temperature sensor probe, deteriorated door gasket seals that allow heat to escape the cavity, or running frequent high-heat self-clean cycles that gradually degrade internal thermal insulation layers.
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