If the 51W15 shows signs of carbon tracking or melted plastic at the terminals

or a restricted chimney/vent pipe that is forcing flames to "roll out" toward the switch

When diagnosing furnace troubleshooting codes related to open limit circuits

Focused on durability and field performance

How do I ensure this valve meets local building codes

Rheem-Ruud 47-102473-03 Limit Switch If the 51W15 shows signsThe Rheem Ruud 47 102473 03 Limit Switch is a critical safety component designed for high limit thermal protection in residential and commercial furnaces. This SPST normally closed switch is engineered to monitor heat exchanger temperatures and break the electrical circuit if the internal temperature exceeds the 190F open temperature threshold. Once the system cools to the 170F close temperature, the auto reset mechanism restores the circuit, allowing