A Reznor 82091 Limit Switch/Thermostat regulates temperature response to protect internal components and maintain reliable function within the heating and cooling unit.
The limit switch/thermostat monitors temperature in the heating and cooling unit and opens the circuit at its 160F setpoint to prevent overheating, then automatically restores operation after temperatures drop through its 50F differential. Its auto-reset design and calibrated switching construction matter because they maintain reliable safety control without manual intervention, supporting steady performance and protecting furnace components from excess heat.
The limit switch/thermostat may be failing if the furnace cycles off unexpectedly, struggles to maintain normal heating or can shut down more often than usual during operation. Physical signs can include discoloration, heat damage or worn terminals and you might notice environmental signs such as excessive dust buildup, restricted airflow or repeated exposure to high heat that could affect its performance.
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