Rheem-Ruud 47-20545-93 Fan & Limit Switch

The Rheem-Ruud 47-20545-93 Fan & Limit Switch is a critical OEM furnace replacement part engineered for precise thermal regulation in Rheem and Ruud gas furnaces. This integrated control senses plenum temperature to manage blower activation and provide high-limit safety protection, effectively preventing heat exchanger damage. Designed with a standard 100°F to 250°F temperature range, this dual-function switch ensures the blower engages only after the heat exchanger has reached the appropriate temperature and terminates operation if safety thresholds are exceeded. For contractors servicing GQA, OGB, OHB, and RGBA furnace models, this direct-fit limit control eliminates the calibration issues often found with universal aftermarket alternatives. Built for high-cycle reliability in demanding residential HVAC applications, it maintains system efficiency by optimizing furnace blower timing and ensuring continuous air circulation safety.

• OEM Precision: Genuine Rheem-Ruud 47-20545-93 factory-spec component ensures exact fit and performance.
• Broad Operating Range: Adjustable or fixed settings spanning 100°F to 250°F for versatile system compatibility.
• System Protection: Acts as a primary safety device to cut power if internal temperatures reach unsafe levels.
• Optimized Airflow: Regulates the furnace fan limit to prevent cold air drafts during the initial start-up cycle.
• Durable Construction: Heavy-duty mechanical contacts designed for long-term reliability in high-temperature environments.

Is the 47-20545-93 compatible with all Rheem gas furnaces?
While it is a common Rheem furnace limit switch, it is specifically designed for GQA, OGB, OHB, and RGBA model series. Always verify the part number against your specific unit's wiring diagram or data plate before installation.

What are the symptoms of a failing fan and limit control?
Common indicators include the furnace fan running continuously, the burner shutting off prematurely before reaching the thermostat setpoint, or the blower failing to engage after the heat exchanger has warmed up.

Can this switch be used in belt-driven or direct-drive systems?
Yes, this combination fan-limit switch is engineered to work across various Rheem/Ruud air handlers and furnaces, provided the thermal sensing requirements match the 100°F–250°F factory specification.

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.