Lennox 93W73 Main Limit Switch — 140°F
The Lennox 93W73 is an OEM replacement main limit switch designed to protect your furnace from dangerous overheating conditions. Set to trip at 140°F, this limit switch monitors heat exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed the safe operating threshold — helping to prevent equipment damage, nuisance shutdowns from thermal stress, and potential safety hazards.
Key Features
- OEM Lennox replacement part — ensures proper fit and reliable performance
- 140°F trip temperature for precise high-limit protection
- Functions as the main limit switch in compatible Lennox furnace models
- Interrupts burner operation upon detecting excessive heat exchanger temperatures
- Helps safeguard heat exchanger integrity and extend equipment life
- Direct drop-in replacement for simplified installation
Application
This limit switch is a direct OEM replacement for compatible Lennox furnace systems. It is engineered to maintain safe operating temperatures within the heat exchanger compartment, shutting down burner operation before temperatures reach levels that could cause equipment damage or create a safety risk.
Why Replace Your Limit Switch?
A faulty or worn limit switch can cause nuisance lockouts, failure to heat, or — in worst-case scenarios — allow unsafe temperatures to persist unchecked. Replacing a suspect limit switch with a genuine Lennox OEM part like the 93W73 restores proper system protection and ensures your furnace operates within its designed safety parameters.
Product Specifications
- Brand: Lennox
- Part Number: 93W73
- Type: Main Limit Switch
- Trip Temperature: 140°F
