Rheem-Ruud 47-23118-01 Limit Switch

The Rheem-Ruud 47-23118-01 is a high-precision HVAC limit switch designed for critical thermal monitoring in residential and commercial air handlers. This SPST normally closed switch functions as a safety primary, automatically interrupting the circuit when temperatures reach the 85°F fixed open temperature to prevent equipment overheating. Engineered for reliability in high-cycle environments, it features an auto reset mechanism that closes the circuit once the temperature drops to the 70°F fixed close temperature, ensuring seamless system restoration without manual intervention.

This genuine OEM replacement part is built with a small flanged airstream mount and features standard 1/4-inch quick-connect terminals for straightforward field installation. With a robust contact rating of 15A at 120VAC and 10A at 230VAC, the 47-23118-01 limit control provides versatile compatibility across various voltage configurations. Its compact 3/16-inch mounting insertion depth allows for precise placement within the airstream, delivering responsive temperature sensing essential for protecting induction motors and heating elements in Rheem, Ruud, and WeatherKing air handlers.

• Automatic Reset Functionality: Eliminates the need for manual restarts by automatically resetting the circuit once temperatures return to the 70°F safety threshold.
• High-Amperage Compatibility: Rated for up to 15A at 120V, making it suitable for a wide range of motor and heater control circuits.
• Precise Thermal Calibration: Fixed temperature settings (85°F Open / 70°F Close) provide consistent protection against thermal overloads.
• Universal HVAC Application: Integrated flange design allows for secure mounting in air handlers, furnaces, and general-purpose heat pump systems.

What causes a limit switch like the 47-23118-01 to trip frequently?
Frequent tripping is usually a symptom of restricted airflow. Technicians should check for dirty air filters, blocked return vents, or a failing blower motor that prevents heat from being dissipated properly.

Can I use this switch in a 230V system?
Yes, the electrical contacts are rated for both 120VAC and 230VAC applications, providing flexibility for different equipment remains.

How do I verify if this limit switch is failing?
With the system off and cooled, use a multimeter to check for continuity across the terminals. Since this is a normally closed (NC) switch, you should see continuity at room temperature. If the circuit is open while the unit is cool, the switch requires replacement.

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.