Rheem-Ruud 47-25349-05 Limit Switch

The Rheem-Ruud 47-25349-05 Limit Switch is a board-mounted safety control engineered to manage high-limit furnace temperatures in specific HVAC residential heating systems. Featuring a 3-inch insertion length, this SPST normally closed switch is designed for high-accuracy thermal monitoring, opening the circuit at a fixed temperature of 200°F and automatically resetting once the heat exchanger cools to 180°F. Coded with an orange/orange identifier for field verification, this OEM replacement limit switch ensures the furnace operates within designed thermal parameters, preventing heat exchanger damage and ensuring the blower assembly functions correctly during high-demand cycles. The auto-reset functionality eliminates manual intervention after temporary overheating events, making it a reliable Rheem furnace part for service contractors performing preventative maintenance or emergency repairs. This limit control provides the exact response curves required to maintain system airflow integrity and burner safety without the drift associated with aftermarket alternatives.

Key Benefits

• Precise Thermal Calibration: Fixed 200°F open and 180°F close settings provide consistent cycling and protect against overheating conditions.
• Direct Board Mounting: Engineered for quick furnace control board integration, reducing labor time during field replacements.
• OEM Standards: Built to exact Rheem-Ruud specifications, ensuring proper electrical resistance and mechanical fit within the plenum.
• Easy Identification: The orange/orange color-coding allows technicians to verify the limit switch temperature rating at a glance.

Common Questions

What causes a 200-degree limit switch to trip frequently?
Frequent tripping usually indicates restricted airflow, such as a blocked filter, closed registers, or a failing blower motor, causing the heat exchanger to exceed safe operating temperatures.

Is the 47-25349-05 limit switch orientation-sensitive?
While the bracket is fixed, the 3" probe must be fully inserted into the air stream as per the manufacturer's mounting holes to ensure accurate temperature sensing.

Can I bypass this switch for testing purposes?
Temporarily jumping the switch is only for diagnostic continuity tests; the system must never be operated without a functional limit switch, as it is a critical safety component.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.