Description
The Lennox 73K17 is an OEM auto-reset high-limit switch engineered to protect Lennox heating systems from dangerous overtemperature conditions. When supply-air or heat exchanger temperatures exceed the rated threshold, this limit switch interrupts the burner circuit and automatically resets once temperatures return to a safe operating range — providing reliable, hands-free protection without requiring manual intervention.
Key Features
- Auto-reset operation — automatically restores burner function once safe temperatures are reached
- Rated temperature range: 205°F trip / 235°F reset
- OEM Lennox replacement part — engineered for precise fit and performance in compatible Lennox furnaces
- Protects heat exchangers and internal components from thermal damage
- Reliable bimetal sensing element for accurate, repeatable temperature response
- Direct drop-in replacement minimizes downtime during service calls
Application
The 73K17 limit switch is designed as a direct OEM replacement for compatible Lennox gas furnaces and heating systems. It is typically mounted on or near the heat exchanger or plenum to monitor supply-air temperatures and safeguard the system against overheating caused by restricted airflow, dirty filters, or blower malfunctions.
Why Choose an OEM Limit Switch?
Using a genuine Lennox replacement limit switch ensures the correct trip and reset temperatures are maintained, preserving the safety and efficiency of the heating system. Aftermarket substitutes may not match the precise calibration required for safe operation.
Specifications
- SKU: 73K17
- Brand: Lennox
- Type: Auto-Reset High-Limit Switch
- Trip Temperature: 205°F
- Reset Temperature: 235°F
- Reset Type: Automatic (AUTO)
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