Description
Lennox 74W76 Auto Limit Switch 200°F Overview
The Lennox 74W76 is an OEM auto limit switch designed to protect furnaces and heating systems from dangerous overheating conditions. Rated at 200°F, this automatic reset limit switch monitors heat exchanger temperatures and interrupts the burner circuit when the set-point temperature is exceeded — then automatically resets once temperatures return to a safe operating range. It is an essential safety component for maintaining reliable, code-compliant furnace operation.
Key Features
- OEM Lennox replacement part — SKU 74W76
- 200°F automatic reset temperature rating
- Automatic reset operation — no manual intervention required after cool-down
- Interrupts burner circuit upon high-temperature detection to prevent heat exchanger damage
- Direct OEM replacement for compatible Lennox furnace models
- Engineered for dependable, long-service-life performance in residential and light commercial applications
Why Limit Switches Matter
Auto limit switches are a critical safety device in forced-air furnaces. When airflow is restricted — due to a clogged filter, blocked vent, or blower failure — heat builds up inside the heat exchanger. The limit switch detects this rise in temperature and shuts down the burner before damage occurs. Using the correct OEM-specified part ensures accurate trip temperatures and reliable automatic reset performance.
Application
- Compatible with select Lennox furnace models requiring the 74W76 limit switch
- Suitable for residential and light commercial forced-air heating systems
- Ideal for service technicians performing preventive maintenance or component replacement
Specifications
- Brand: Lennox
- Part Number / SKU: 74W76
- Type: Auto (Automatic) Reset Limit Switch
- Temperature Rating: 200°F
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