Description
Lennox 12P55 L190-30F Main Limit Switch Overview
The Lennox 12P55 is an OEM main limit switch designed to protect your furnace from overheating conditions. Carrying the model designation L190-30F, this switch is engineered to open the circuit at 190°F and automatically reset (close) once temperatures drop back to 160°F — a 30°F differential that ensures reliable, consistent safety operation. It is a direct-fit replacement for Lennox furnace systems that specify the L190-30F limit switch, helping restore safe, efficient heating performance.
Key Features
- OEM Lennox replacement main limit switch
- Opens (trips) at 190°F to protect against furnace overheating
- Automatic reset closes at 160°F (30°F differential)
- Direct OEM replacement for compatible Lennox furnace models
- Helps prevent heat exchanger damage and unsafe operating conditions
- SKU: 12P55 | Model: L190-30F
Specifications
- Brand: Lennox
- Part Number: 12P55
- Model: L190-30F
- Switch Type: Main Limit Switch
- Open Temperature: 190°F
- Close Temperature: 160°F
- Differential: 30°F
Application
Main limit switches are a critical furnace safety component. When airflow is restricted or the heat exchanger reaches unsafe temperatures, the limit switch opens the control circuit to shut off the burners, preventing equipment damage and potential hazards. The Lennox 12P55 L190-30F is designed as a precise OEM match for Lennox furnaces requiring this specification, ensuring accurate trip points and dependable reset performance.
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