3L01-165 Copeland Comfort Control (White Rodgers) L165-40F
3L01-165 Copeland Comfort Control (White Rodgers) L165-40F In125F Out 165F
The 3L01-165 Snap Disc Limit Switch (White-Rodgers / Copeland Comfort Control) is an automatic reset temperature safety control designed to protect HVAC and refrigeration equipment from overheating. Featuring a 165°F fixed cut-out temperature and 125°F fixed cut-in temperature, this open-on-rise switch interrupts the control circuit when excessive temperatures occur and automatically resets once temperatures return to a safe operating level.
Cross-Reference
- 3L01-165
- 3L01165
- L165-40F
- 60T11-610069
- White-Rodgers 3L01-165
- Copeland Comfort Control 3L01-165
Direct OEM
White-Rodgers 3L01-165
Compatible Brands
- White-Rodgers
- Emerson
- Copeland
- York
- Coleman
- Luxaire
- Universal HVAC Applications
- Refrigeration Equipment Manufacturers
Application
Used in HVAC and refrigeration equipment to:
- Protect components from overheating
- Open the circuit at 165°F
- Automatically reset at 125°F
- Safeguard motors, compressors, heaters, and control circuits
- Prevent damage caused by excessive operating temperatures
- Improve equipment safety and reliability
Related Components
- Snap Disc Limit Switch
- High Limit Control
- Fan Switch
- Fan & Limit Control
- Control Board
- Transformer
- Compressor Contactor
- Temperature Sensor
- Blower Relay
Technician Notes
The 3L01-165 is an automatic reset, open-on-rise limit switch. Contacts remain closed during normal operation and open when the sensing surface reaches 165°F. The switch automatically resets when temperature falls to approximately 125°F. Always verify temperature ratings, terminal configuration, mounting style, and switch action before replacement.
Repeated limit trips typically indicate airflow restrictions, dirty coils, failing motors, blocked vents, excessive heat load, or other operational issues that should be diagnosed before replacing the switch.
Common Symptoms of Failure
- Equipment shuts down on safety
- Open limit circuit fault
- Intermittent operation
- No continuity through switch contacts
- Heating or cooling lockouts
- Repeated nuisance trips
- Compressor protection faults
- Failure to restart after overheating
- Reduced system reliability
Installation Tips
- Disconnect power before servicing.
- Verify temperature ratings match the original switch.
- Confirm switch action is "Open on Rise."
- Mount securely to the original sensing surface.
- Inspect terminals for corrosion or heat damage.
- Check airflow and operating temperatures.
- Verify continuity before startup.
- Test complete system operation after installation.
Recommended Inspection Items
- Blower motor operation
- Airflow and duct restrictions
- Evaporator and condenser coil cleanliness
- Electrical terminals
- Wiring harness condition
- Control board diagnostics
- Compressor operating temperature
- Supply voltage
- Ventilation around equipment
Controls, Temperature, 125 degrees F Fixed Cut-in Temperature, 165 degrees F Fixed Cut-out Temperature, Open on Rise Switch Action, Snap Disc Auto Reset Limit Switch (60T11-610069)
