Description
Lennox 38M67 L190-30F Limit Switch Overview
The Lennox 38M67 is an OEM replacement L190-30F limit switch engineered to provide reliable high-temperature protection in Lennox furnace applications. Designed to open at 190°F and reset at 160°F (30°F differential), this limit switch guards against overheating by interrupting the burner circuit whenever supply-air temperatures exceed safe operating thresholds — protecting both the heat exchanger and the overall system from thermal damage.
Key Features
- OEM Lennox replacement part — ensures precise fit and performance
- Opens (trips) at 190°F to protect against furnace overheating
- 30°F differential — automatically resets at approximately 160°F
- Interrupts burner operation on high-temperature fault for system safety
- Direct drop-in replacement for compatible Lennox furnace models
- Durable construction for long service life in demanding HVAC environments
Specifications
- Part Number: L190-30F
- SKU: 38M67
- Brand: Lennox
- Open Temperature: 190°F
- Differential: 30°F (Reset at ~160°F)
- Type: Automatic-Reset Limit Switch
- Application: Lennox Gas Furnaces
Application
This limit switch is a critical safety component in Lennox forced-air gas furnaces. When airflow is restricted or a fault condition causes the heat exchanger to overheat, the L190-30F trips the burner circuit, preventing equipment damage and potential fire hazards. Always verify compatibility with your specific Lennox furnace model before installation.
