Lennox 25M59 AUTO Limit Switch Overview
The Lennox 25M59 is an automatic-reset high-limit switch engineered to protect furnace heat exchangers and system components from dangerous overtemperature conditions. When supply-air temperatures exceed the rated threshold, the switch opens the control circuit and shuts down the burner — then automatically resets once temperatures return to a safe operating range, eliminating the need for manual intervention after a nuisance trip.
Key Specifications
- OEM Part Number: 25M59
- Brand: Lennox
- Temperature Range: 140°F – 170°F
- Reset Type: AUTO (automatic reset)
- Application: Lennox furnace high-limit protection
Features & Benefits
- Automatic reset operation minimizes downtime after a high-limit event
- Precise trip-point range (140–170°F) guards against heat exchanger overheating
- Direct OEM replacement ensures proper fit and reliable performance
- Interrupts burner operation to prevent equipment damage and potential fire hazards
- Durable construction rated for the demanding thermal environment inside a furnace cabinet
Application
Designed as a direct OEM replacement for Lennox gas furnaces, the 25M59 limit switch mounts in the furnace plenum or heat exchanger area to continuously monitor supply-air temperature. It is an essential safety component that keeps your heating system operating within safe limits, protecting both the equipment and the occupants of the building.
Why Buy From Jackson Systems?
Jackson Systems stocks genuine OEM Lennox replacement controls so HVAC professionals can get the right part fast. Order the Lennox 25M59 today for same-day processing on in-stock items.
