Description
The Lennox 18M84 is an OEM auto limit switch engineered to protect furnace and heating system components from dangerous overtemperature conditions. Designed as a direct Lennox replacement part, this limit switch features automatic reset functionality and a 3″ insertion depth, making it compatible with a range of Lennox heating equipment.
Key Features
- Auto-reset limit switch for reliable, hands-free recovery after a high-temperature event
- Operating temperature range: 230°F–260°F for precise overheat protection
- 3″ insert depth for proper sensing element placement within the heat exchanger or plenum
- OEM Lennox replacement part — ensures fit, form, and function match original specifications
- Helps prevent heat exchanger damage, component failure, and unsafe operating conditions
Specifications
- Brand: Lennox
- SKU: 18M84
- Switch Type: Auto Limit Switch (Auto-Reset)
- Temperature Range: 230°F – 260°F
- Insert Length: 3″
Application
The Lennox 18M84 auto limit switch is a critical safety component in gas furnaces and forced-air heating systems. It monitors air temperature within the furnace plenum or heat exchanger and automatically interrupts the circuit if temperatures exceed the set threshold, protecting the system from overheating. The auto-reset design restores normal operation once temperatures return to a safe level, minimizing downtime and service calls.
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