What is a common outcome of a malfunctioning limit switch?

A malfunctioning limit switch typically causes the system to get too hot. This component is meant to monitor the temperature within the furnace and ensure that it does not exceed safe operational limits. When the limit switch fails, it may either become stuck in the closed position or fail to open when it should, resulting in excessive heat build-up. This can lead not only to inefficient operation of the furnace but also poses a significant safety risk, including potential fire hazards or damage to the furnace itself.

This condition can trigger additional safety mechanisms, but the primary and immediate consequence is overheating. Hence, recognizing the limit switch's role in regulating temperature is crucial for understanding its importance in the safe and efficient operation of a gas furnace.