Rheem-Ruud 47-25349-02 Limit Switch

The Rheem-Ruud 47-25349-02 Limit Switch is a critical safety component designed for precise thermal regulation within HVAC systems. This SPST normally closed switch features a 3-inch insertion length and is engineered for board-mounted applications, commonly identified by its blue/blue color coding. As an auto-reset temperature control, it features a fixed open temperature of 170°F and a fixed close temperature of 150°F, ensuring the system shuts down if internal temperatures exceed safe operating parameters. This OEM furnace limit switch is built for durability in Rheem and Ruud gas furnaces, providing reliable overheat protection and preventing dangerous heat exchanger conditions. For technicians, this 170-degree limit switch is a direct drop-in replacement that maintains original equipment specifications, ensuring proper airflow monitoring and furnace sequencing. Precise temperature limit control is essential for maintaining system longevity and preventing furnace high limit trips during high-static or restricted airflow scenarios.

• Fixed Thermal Operation: Calibration-free performance with a reliable 170°F cutout and 150°F reset.
• Standardized Integration: Features a 3" probe depth and board-mount configuration for fast field installation.
• Direct OEM Compatibility: Replaces specific Rheem-Ruud part numbers without requiring modification to the mounting plate or wiring harness.
• Automatic Reset: Eliminates unnecessary service calls by resetting once the plenum temperature returns to a safe 150°F.
• Visual Identification: Blue-on-blue color coding allows for rapid identification and verification during troubleshooting.

What causes this limit switch to trip frequently?
Frequent tripping is typically symptomatic of restricted airflow, such as a dirty air filter, blocked return air ducts, or a failing blower motor rather than a faulty switch.

Can I use a 2-inch insertion probe if the original was 3 inches?
It is not recommended. The 3-inch insertion depth is specified to ensure the sensor reaches the optimal point in the airflow path for accurate temperature sensing.

How do I verify if the 47-25349-02 is failing?
Using a multimeter, check for continuity across the terminals. Since this is a normally closed switch, it should show continuity at room temperature; an open circuit when cool indicates a failed 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.