What are two main causes of infinite switch failures?

The two main causes of infinite switch failures are indeed burned wire connections and excessive ambient heat.

Burned wire connections typically occur due to prolonged exposure to high current loads, which can cause overheating at connection points. This overheating can lead to insulation breakdown, eventually resulting in an open or short circuit failure within the switch. Consequently, the infinite switch may be unable to function properly, as it relies on these connections to regulate temperature in equipment.

Excessive ambient heat can also contribute significantly to infinite switch failures. When switches are exposed to high temperatures, either from surrounding equipment or inadequate ventilation, it can accelerate the degradation of internal components. Components may warp, solder joints may weaken, and the overall lifespan of the switch can be shortened, leading to failure.

Other options presented touch on various dynamics related to electrical systems but do not specifically align with the primary failure modes associated with infinite switches in commercial food service equipment. Understanding the causes of these failures is crucial for proper equipment maintenance and reliability.