The York S1-3400-3151 is an OEM auto-reset high-limit switch engineered to protect furnaces and heating equipment from dangerous overtemperature conditions. With a fixed operating range of 125°F to 175°F, this limit switch automatically monitors supply-air or heat exchanger temperatures and interrupts the burner circuit when temperatures exceed the safe threshold — then automatically resets once conditions return to normal, minimizing nuisance service calls.
Key Features
- Auto-reset (AUTO) operation — automatically restores normal function once temperatures fall within the safe range
- Temperature range: 125°F to 175°F
- OEM York replacement part — ensures proper fit and function in compatible York heating systems
- Protects heat exchangers and furnace components from overheating damage
- Interrupts burner circuit on high-temperature fault for safe system shutdown
- Direct OEM replacement for reliable, long-term performance
Application
The S1-3400-3151 is designed as a direct OEM replacement limit switch for York furnaces and heating systems. It is installed in the supply-air plenum or on the heat exchanger to continuously monitor operating temperatures. When temperatures rise above the set point, the switch opens the control circuit, shutting down the burner to prevent equipment damage or unsafe conditions.
Why Choose OEM York Parts?
Using genuine York OEM components ensures compatibility, maintains equipment warranties, and delivers the performance and reliability that York systems are engineered to deliver. The S1-3400-3151 is the correct replacement to restore safe, efficient furnace operation.
