A Rheem 47-17359-30 Limit Switch monitors temperature conditions and resets automatically to maintain safe, consistent performance in the HVAC system.
The limit switch monitors temperature in the heating and cooling unit and opens the circuit when temperatures reach its 180F setpoint, then automatically closes again after the temperature drops by its 20F differential. Its normally closed SPST design and auto-reset construction are important because they provide reliable over-temperature protection without manual intervention, helping the unit maintain safe and consistent operation.
The limit switch might be wearing out if the HVAC system shuts down unexpectedly, cycles irregularly or fails to restart normally after an overheating condition. Physical signs can include discoloration, heat damage or loose terminals and environmental signs may include long-term exposure to excessive heat, vibration or dust that could affect switching performance.
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