Description
Lennox 56W25 AUTO Limit Switch Overview
The Lennox 56W25 is an automatic-reset high-limit switch engineered to protect furnaces and heating equipment from dangerous overtemperature conditions. Rated for a temperature range of 220–250°F, this OEM-quality component monitors heat exchanger temperatures and interrupts the burner circuit when unsafe conditions are detected, then automatically resets once temperatures return to a safe operating range — eliminating the need for manual intervention after a nuisance trip.
Key Features
- Temperature range: 220–250°F (AUTO reset)
- Automatic reset operation — no manual reset required after trip
- OEM replacement part designed for Lennox heating systems
- Interrupts burner circuit to prevent heat exchanger damage and fire hazard
- Reliable bimetal sensing element for accurate temperature response
- Direct drop-in replacement for original Lennox limit switch applications
Application
The 56W25 limit switch is a genuine Lennox replacement component intended for use in Lennox furnaces and air handlers where high-limit overheat protection is required. It is installed in the supply air plenum or heat exchanger area and serves as a critical safety device in the heating system’s control circuit.
Why Replace Your Limit Switch?
- Furnace shuts off prematurely or fails to fire
- Nuisance tripping due to a worn or out-of-calibration switch
- Preventive maintenance during annual furnace servicing
- Restoring proper high-limit protection after overheating event
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