Carrier HH12HV145 Temp Switch

The Carrier HH12HV145 Temp Switch is a critical safety component designed for precise thermal regulation within residential and commercial HVAC systems. This OEM temperature limit switch features a snap-action bimetal disc that ensures reliable circuit interruption when internal temperatures reach the 145°F cut-off point. Rated for electrical loads up to 25 amps at 240VAC, this double pole single throw (DPST) switch is engineered to monitor heat exchanger conditions in furnaces, air handlers, and heat pumps, preventing equipment damage and hazardous overheating. The normally closed (NC) contacts provide an automatic reset once temperatures descend to the 55°F differential threshold. For service technicians, this HH12HV145 furnace limit switch serves as a direct drop-in replacement for the common 64TX11 style controls, ensuring domestic system compatibility and restoring proper furnace cycling. Its compact 2-pole design and crimp-style connectors facilitate a fast, secure installation in tight cabinet clearances.

• High-Amperage Capacity: Robustly handles up to 25A at 240VAC, making it suitable for high-demand blower and heater circuits.
• Precise Thermal Response: Specifically calibrated with a 145°F trip point to protect the heat exchanger from thermal stress.
• Broad Compatibility: Functions as a direct replacement for Carrier, Bryant, and Payne models, including model numbers 208405 and HH12HV145A.
• Automatic Reset: Eliminates manual intervention by resetting the circuit once temperatures return to the safe 55°F operating range.
• OEM Build Quality: Genuine Carrier replacement part ensures exact fitment and maintains the original engineering specifications of the HVAC unit.

Is the HH12HV145 a manual or automatic reset switch?
This is an automatic reset switch. It will open the circuit at 145°F and automatically re-close once the temperature drops back down to the reset differential.

What are the symptoms of a failing furnace limit switch?
Common indicators include the indoor blower fan running continuously, the furnace short-cycling (turning on and off rapidly), or the system failing to initiate a heating cycle entirely due to an open circuit.

Can I use this switch in a 208V system?
Yes, the Carrier HH12HV145 is rated for up to 240VAC, making it fully compatible with standard 208V/230V HVAC electrical configurations.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.