replacing a fouled or drifting limit switch is a standard protocol to restore safe furnace ignition sequences

keeping the pilot assembly clean for longer service intervals

this limit switch serves as a primary safeguard by monitoring for restricted airflow or draft obstructions within the venting system

When troubleshooting Lennox error code 201

This 36-inch thermocouple is rated for a maximum hot junction temperature of 1450°F

Rheem-Ruud SP10399B Pilot Assembly replacing a fouled or driftingEnsure reliable ignition and peak burner performance with the Rheem Ruud SP10399B Natural Gas Pilot Assembly. Designed as a genuine PROTECH OEM replacement part, this assembly is engineered specifically for compatibility with Rheem and Ruud commercial and residential gas water heaters, including the R & RCD Series. Utilizing natural gas (NG), the SP10399B provides a stable, consistent pilot flame necessary for the proper cycling of the main burner