it is professional best practice to inspect all limit switches in the circuit simultaneously to ensure consistent thermal response across the heating cycle

Frequent tripping usually indicates an overheating issue often caused by a dirty air filter

Versatile Application: Ideal for furnace blowers

Essential for restoring furnace manifold pressure and pilot flame stability

and FR series

York S1-025-30321-700 Limit Switch it is professional best practiceThe York S1 025 30321 700 Limit Switch is a critical safety component engineered for precise thermal monitoring in high output HVAC furnace systems. This 185F manual reset limit switch is designed to break the electrical circuit if the heat exchanger exceeds its safe operational threshold, preventing catastrophic equipment failure and ensuring safe discharge air temperatures. Featuring a changeover (CO) configuration, this part offers versatile