The 10123533 furnace limit switch functions as a critical safety component in compatible heating systems, designed to monitor plenum temperatures and prevent hazardous overheating. This switch interrupts the fuel supply when temperatures reach 200°F and requires manual reset after cooling, ensuring potential issues (such as blower failure or restricted airflow) are addressed before operation resumes.
Technical Specifications：
Temperature rating: L200F (opens at 200°F)
Reset type: Manual (requires physical activation post-cooling)
Function: Overheat protection for furnace combustion systems
Compatible Models：
This limit switch is verified for use with the following furnace models:
GNJ050N12A1
GNJ075N12A1
GNJ100N12A1
GNJ125N20A1
Compatibility extends beyond the listed models. Always confirm your furnace's exact model number against the manufacturer's specifications to ensure proper fit and functionality.
Installation Guidelines：
1. Disconnect all electrical power and shut off gas supply before beginning
2. Locate existing limit switch (typically mounted near the heat exchanger)
3. Note wire connections and mounting orientation before removal
4. Secure new switch in position using original hardware
5. Reconnect wiring according to manufacturer diagrams
6. Restore power only after verifying all connections are secure
Package includes 2 x 10123533 furnace limit switches with manual reset buttons.