Description
The Lennox 18K44 is a factory-specified automatic reset limit switch engineered to protect your furnace from dangerous overheating conditions. Designed as a direct OEM replacement for compatible Lennox heating systems, this limit switch continuously monitors heat exchanger temperatures and interrupts the burner circuit when temperatures exceed the set point — then automatically resets once safe operating temperatures are restored.
How It Works
The limit switch acts as a critical safety device within the furnace control circuit. When the air temperature at the sensing element rises to the trip point, the switch opens the circuit to shut down the burner. Once temperatures fall back within the safe operating range, the AUTO reset function restores normal operation without requiring manual intervention — minimizing downtime and service calls.
Key Features
- AUTO (automatic) reset operation — no manual reset required
- 250°F trip / 280°F reset temperature range
- Direct OEM replacement for compatible Lennox furnace models
- Protects heat exchanger and furnace components from thermal damage
- Interrupts burner circuit on high-temperature fault condition
- Restores operation automatically once safe temperatures are reached
Specifications
- Brand: Lennox
- Part Number: 18K44
- Switch Type: Automatic (AUTO) Reset Limit Switch
- Trip Temperature: 250°F
- Reset Temperature: 280°F
- Application: Lennox Compatible Furnaces
Application
Ideal for HVAC technicians and service professionals performing routine maintenance, safety inspections, or component replacement on Lennox furnace systems. Always verify compatibility with the specific furnace model before installation.
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