Description
Lennox 25J30 AUTO Limit Switch Overview
The Lennox 25J30 is an automatic reset limit switch engineered to protect furnace heat exchangers and related heating equipment from dangerous overtemperature conditions. With a calibrated operating range of 125°F to 155°F, this limit switch monitors supply-air or plenum temperatures and interrupts the burner circuit whenever temperatures exceed the set point — then automatically resets once conditions return to a safe level, minimizing downtime and service calls.
Key Features
- Automatic (AUTO) reset operation — restores normal function once temperature drops below the trip point
- Temperature range: 125°F to 155°F
- OEM Lennox replacement part — direct-fit for compatible Lennox furnace models
- Interrupts burner circuit on overtemperature to prevent heat exchanger damage
- Compact design for straightforward installation in tight furnace cabinets
- Reliable bimetal sensing element for accurate, repeatable temperature response
Application
The 25J30 limit switch is a genuine Lennox OEM replacement component designed for use in Lennox gas and oil furnaces. It serves as a primary high-temperature safety device, cutting power to the burner or gas valve when plenum or heat exchanger temperatures rise above the rated threshold. The auto-reset feature makes it well suited for applications where nuisance lockouts must be minimized while still maintaining full overheat protection.
Specifications
- SKU / Part Number: 25J30
- Brand: Lennox
- Switch Type: Automatic (AUTO) Reset Limit Switch
- Temperature Range: 125°F – 155°F
- Application: Lennox furnace overheat protection
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