Description
Lennox 18K43 Auto Limit Switch — 270–300°F, 7″ Insulated
The Lennox 18K43 is a factory-specified automatic limit switch engineered to protect furnace heat exchangers and components from dangerous overtemperature conditions. With a rated operating range of 270–300°F and a 7″ insulated construction, this limit switch is a direct OEM replacement designed for reliable, long-service performance in Lennox heating systems.
Key Features
- Auto-reset limit switch for automatic restoration after temperature normalizes
- Operating temperature range: 270–300°F
- 7″ insulated design for safe installation in high-temperature environments
- OEM Lennox replacement part — ensures proper fit and function
- Protects furnace components from overheating damage
- Durable construction built to Lennox quality standards
Application
The 18K43 limit switch is intended for use in Lennox gas furnaces as a high-limit safety control. It monitors heat exchanger temperatures and interrupts the burner circuit if temperatures exceed the safe threshold, preventing equipment damage and potential safety hazards. The auto-reset function allows the system to resume normal operation once temperatures return to a safe level.
Product Specifications
- Brand: Lennox
- Part Number: 18K43
- Switch Type: Automatic Limit Switch
- Temperature Range: 270–300°F
- Insertion Length: 7″ Insulated
- Application: Gas Furnace High-Limit Protection
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