Rheem-Ruud 47-102473-02 Limit Switch

The Rheem-Ruud 47-102473-02 Limit Switch is a critical safety component designed for high-limit temperature monitoring in furnace and air handler applications. As a veteran-grade OEM furnace replacement part, this device features a fixed 170°F open temperature and a 150°F close temperature, maintaining a precise 20°F differential. This SPST normally closed switch serves as the primary protection against heat exchanger overheating, automatically breaking the circuit when thermal limits are exceeded to prevent equipment damage. This unit is the direct manufacturer-specified replacement for the legacy 47-21711-06 limit control, ensuring seamless mechanical and electrical compatibility. Engineered with a 3-inch insertion length and a board-mount configuration, it facilitates rapid field installation for service contractors. The auto-reset mechanism restores operation once temperatures return to the 150°F threshold, eliminating unnecessary manual resets while maintaining strict system safety. Utilizing the TOD 36T switch series architecture, this general-purpose limit control is built for high-cycle reliability in residential and light commercial HVACR systems.

• Direct OEM Compatibility: Perfectly replaces the 47-21711-06, ensuring 100% fit and function without bracket modifications.
• Precise Thermal Calibration: Fixed 170°F setpoint prevents nuisance tripping while protecting the integrity of the heat exchanger.
• Durable Board-Mount Design: Rugged 90-degree strap mounting provides vibration resistance for stable operation near high-velocity blowers.
• Automated System Recovery: Integrated auto-reset feature simplifies troubleshooting and restores heating once safe internal temperatures are reached.
• Industry-Standard Terminals: Equipped with 1/4-inch quick-connect terminals for fast, secure wiring.

Is the 47-102473-02 compatible with older Ruud furnaces?
Yes, this is the official replacement for the 47-21711-06 and is widely used across Rheem and Ruud gas furnace platforms as long as the 3-inch insertion depth and temperature ratings match your original specifications.

What causes this limit switch to trip frequently?
Frequent cycling or "tripping" is often a symptom of restricted airflow. Check for dirty air filters, blocked return grilles, or a failing blower motor, as these issues cause plenum temperatures to exceed the 170°F limit.

Can I use a higher temperature limit switch instead of this model?
No. For safety and performance, you must use the temperature rating specified by the equipment manufacturer. Installing a switch with a higher open temperature can lead to heat exchanger failure or hazardous operating conditions.

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.