Description
Lennox 42J06 Auto-Reset Limit Switch Overview
The Lennox 42J06 is an OEM-grade automatic-reset limit switch engineered to protect furnaces and heating equipment from unsafe operating temperatures. Designed as a direct replacement for compatible Lennox heating systems, this limit switch provides dependable high-temperature cutout performance to safeguard heat exchangers, blower assemblies, and downstream components.
How It Works
The 42J06 operates as an automatic (AUTO) reset limit switch, meaning it will automatically restore circuit continuity once the sensed temperature drops back to a safe level. When the air temperature at the switch location reaches the upper threshold, the switch opens the circuit — shutting down the burner or heating element — then resets itself once temperatures return to normal operating range. This self-resetting action reduces nuisance service calls while maintaining continuous protection.
Key Specifications
- Brand: Lennox
- Part Number / SKU: 42J06
- Switch Type: AUTO (Automatic) Reset
- Temperature Range: 100–120°F
- Application: Furnace overheat / high-limit protection
- OEM Replacement Part for Compatible Lennox Equipment
Features & Benefits
- Automatic reset eliminates the need for manual intervention after a trip event
- Precisely calibrated 100–120°F operating range ensures accurate overheat detection
- OEM Lennox part for assured fit, form, and function in compatible systems
- Protects heat exchangers and system components from thermal damage
- Straightforward drop-in replacement to minimize downtime during service calls
Application
The Lennox 42J06 limit switch is intended for use in Lennox furnaces and heating units that require a 100–120°F auto-reset high-limit control. Always verify compatibility with your specific Lennox model before installation. Consult the equipment service manual for proper mounting location, wiring, and torque specifications.
