Description
The Lennox 52M42 is a factory-specified AUTO (automatic reset) limit switch designed to protect furnaces and heating equipment from overheating conditions. Rated to open at 180°F with a 40°F differential — meaning it resets at 140°F — this limit switch provides reliable, automatic high-temperature cutout protection without requiring manual intervention after the overheat condition clears.
How It Works
When the supply air or heat exchanger temperature rises to the set point of 180°F, the limit switch opens the control circuit, shutting down the burner or heating element to prevent damage. Once temperatures fall by 40°F to 140°F, the switch automatically resets and restores normal operation — ideal for applications where nuisance lockouts must be minimized.
Key Features
- Opens (trips) at 180°F
- 40°F differential — auto-resets at 140°F
- Automatic (AUTO) reset operation — no manual reset required
- Direct OEM replacement for compatible Lennox furnace models
- Helps protect heat exchangers, burners, and blower components from thermal damage
- Compact design for easy installation in tight furnace cabinets
Application
The 52M42 is an OEM Lennox replacement part intended for use in Lennox gas furnaces and air handlers where a 180°F AUTO limit switch is specified. Always verify compatibility with your specific unit model before installation.
Why Choose an OEM Limit Switch?
Using a genuine Lennox OEM limit switch ensures proper trip and reset temperatures, correct form factor, and reliable performance that aftermarket alternatives may not consistently provide. Protect your equipment investment with the right part the first time.
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