Rheem-Ruud 47-25349-03 Limit Switch

As a critical safety component for commercial and residential heating systems, the Rheem-Ruud 47-25349-03 Limit Switch is engineered to monitor heat exchanger temperatures and prevent thermal over-stress. This furnace high limit switch features a Single Pole Single Throw (SPST) Normally Closed configuration, designed to break the circuit when the fixed open temperature reaches 150°F. Once the plenum cools to the 130°F fixed close temperature, the internal bimetal disc triggers an auto reset to restore operation. With a 3-inch insertion length and a yellow-coded board mount, this OEM replacement part ensures precise fitment in the supply air stream. It is the designated engineering upgrade for the discontinued 47-22679-03, addressing common issues like furnace short cycling and premature blower activation. Technicians should verify board mounting clearance and ensure the L150-20 temperature rating matches the original equipment manufacturer's data plate specification to maintain system integrity and safety protocol compliance.

• Universal Compatibility: Serves as the direct OEM replacement for 47-22679-03 and legacy Rheem-Ruud limit switches.
• Enhanced Safety: Precision calibrated 150°F cutout prevents heat exchanger overheating during low airflow conditions.
• Reliable Switching: Features SPST normally closed contacts with high-grade bimetal construction for consistent auto reset performance.
• Direct Fit: The 3" insertion depth and board-mounted profile allow for rapid field installation without cabinet modifications.

How do I know if my Rheem furnace limit switch is bad?
If the furnace blower runs continuously while the burners remain off, or if the system is short cycling through the high limit circuit, the switch likely needs testing for continuity. A faulty switch may fail in the open position, preventing ignition.

Can I use the 47-25349-03 to replace different temp-rated switches?
No. For safety and performance, you must match the 150°F open and 130°F close ratings. Using an incorrect limit can cause the furnace to run too hot or cycle unnecessarily.

Does this switch require manual resetting?
This is an auto-reset limit switch. It will automatically re-close the circuit once the sensed temperature drops to 130°F.

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.