Carrier HH680300 Limit Switch
The Carrier HH680300 is an essential OEM L140-15F 3-wire limit switch designed for precision thermal monitoring in residential and commercial furnaces. As a primary safety control switch, it features a fixed 140-degree Fahrenheit cut-out setpoint and a 15-degree differential, ensuring the system interrupts operation effectively if the plenum temperature exceeds safe factory limits. This SPDT limit switch is engineered for high-cycle reliability, maintaining narrow tolerances to prevent heat exchanger damage or unsafe operating conditions characteristic of restricted airflow or failed blower components.
For technicians performing a furnace limit switch replacement, this 3-wire configuration provides seamless integration with the integrated furnace control (IFC) board. Utilizing a genuine Carrier HH680300 ensures exact terminal alignment and mounting depth, which is critical for accurate sensing within the air stream. Replacing aging or tripped-out HVAC high limit sensors with this factory-authorized part restores the original safety sequence and protects against the intermittent code 33 errors commonly encountered in Carrier and Bryant high-efficiency platforms.
Key Benefits for the Contractor- OEM Precision: Guaranteed 140°F cut-out and 125°F reset points provide reliable thermal protection without premature tripping.
- 3-Wire SPDT Logic: Specifically designed to handle dual-function signaling required by modern electronic ignition systems.
- Broad Compatibility: Direct drop-in replacement for part numbers 65380D1, P331-2107, 01-3111, and 56566D1.
- Critical Safety: Prevents heat exchanger cracking by enforcing a hard shut-down of the gas valve during overheating events.
What does the L140-15F designation signify on this switch?
The "L140" indicates the high-limit opening temperature is 140°F. The "-15" represents the differential, meaning the switch will reset (close) once the temperature drops 15 degrees below the trip point to approximately 125°F.
Why is my Carrier furnace throwing a "Limit Switch Open" code?
While a failed switch is possible, often this code is triggered by restricted airflow due to a dirty filter, blocked returns, or a failing blower motor. If airflow is verified, the HH680300 should be tested for continuity to confirm internal contact failure.
Can I use a 2-wire switch in place of this 3-wire HH680300?
No. The 3-wire configuration is required for specific control board logic. Using a 2-wire alternative will likely result in system lockouts or improper safety sequencing.
Item is Non Cancelable / Non Returnable
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.
Carrier HH680300 Limit Switch
The Carrier HH680300 is an essential OEM L140-15F 3-wire limit switch designed for precision thermal monitoring in residential and commercial furnaces. As a primary safety control switch, it features a fixed 140-degree Fahrenheit cut-out setpoint and a 15-degree differential, ensuring the system interrupts operation effectively if the plenum temperature exceeds safe factory limits. This SPDT limit switch is engineered for high-cycle reliability, maintaining narrow tolerances to prevent heat exchanger damage or unsafe operating conditions characteristic of restricted airflow or failed blower components.
For technicians performing a furnace limit switch replacement, this 3-wire configuration provides seamless integration with the integrated furnace control (IFC) board. Utilizing a genuine Carrier HH680300 ensures exact terminal alignment and mounting depth, which is critical for accurate sensing within the air stream. Replacing aging or tripped-out HVAC high limit sensors with this factory-authorized part restores the original safety sequence and protects against the intermittent code 33 errors commonly encountered in Carrier and Bryant high-efficiency platforms.
Key Benefits for the Contractor- OEM Precision: Guaranteed 140°F cut-out and 125°F reset points provide reliable thermal protection without premature tripping.
- 3-Wire SPDT Logic: Specifically designed to handle dual-function signaling required by modern electronic ignition systems.
- Broad Compatibility: Direct drop-in replacement for part numbers 65380D1, P331-2107, 01-3111, and 56566D1.
- Critical Safety: Prevents heat exchanger cracking by enforcing a hard shut-down of the gas valve during overheating events.
What does the L140-15F designation signify on this switch?
The "L140" indicates the high-limit opening temperature is 140°F. The "-15" represents the differential, meaning the switch will reset (close) once the temperature drops 15 degrees below the trip point to approximately 125°F.
Why is my Carrier furnace throwing a "Limit Switch Open" code?
While a failed switch is possible, often this code is triggered by restricted airflow due to a dirty filter, blocked returns, or a failing blower motor. If airflow is verified, the HH680300 should be tested for continuity to confirm internal contact failure.
Can I use a 2-wire switch in place of this 3-wire HH680300?
No. The 3-wire configuration is required for specific control board logic. Using a 2-wire alternative will likely result in system lockouts or improper safety sequencing.
Item is Non Cancelable / Non Returnable
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Carrier HH680300 is an essential OEM L140-15F 3-wire limit switch designed for precision thermal monitoring in residential and commercial furnaces. As a primary safety control switch, it features a fixed 140-degree Fahrenheit cut-out setpoint and a 15-degree differential, ensuring the system interrupts operation effectively if the plenum temperature exceeds safe factory limits. This SPDT limit switch is engineered for high-cycle reliability, maintaining narrow tolerances to prevent heat exchanger damage or unsafe operating conditions characteristic of restricted airflow or failed blower components.
For technicians performing a furnace limit switch replacement, this 3-wire configuration provides seamless integration with the integrated furnace control (IFC) board. Utilizing a genuine Carrier HH680300 ensures exact terminal alignment and mounting depth, which is critical for accurate sensing within the air stream. Replacing aging or tripped-out HVAC high limit sensors with this factory-authorized part restores the original safety sequence and protects against the intermittent code 33 errors commonly encountered in Carrier and Bryant high-efficiency platforms.
Key Benefits for the Contractor- OEM Precision: Guaranteed 140°F cut-out and 125°F reset points provide reliable thermal protection without premature tripping.
- 3-Wire SPDT Logic: Specifically designed to handle dual-function signaling required by modern electronic ignition systems.
- Broad Compatibility: Direct drop-in replacement for part numbers 65380D1, P331-2107, 01-3111, and 56566D1.
- Critical Safety: Prevents heat exchanger cracking by enforcing a hard shut-down of the gas valve during overheating events.
What does the L140-15F designation signify on this switch?
The "L140" indicates the high-limit opening temperature is 140°F. The "-15" represents the differential, meaning the switch will reset (close) once the temperature drops 15 degrees below the trip point to approximately 125°F.
Why is my Carrier furnace throwing a "Limit Switch Open" code?
While a failed switch is possible, often this code is triggered by restricted airflow due to a dirty filter, blocked returns, or a failing blower motor. If airflow is verified, the HH680300 should be tested for continuity to confirm internal contact failure.
Can I use a 2-wire switch in place of this 3-wire HH680300?
No. The 3-wire configuration is required for specific control board logic. Using a 2-wire alternative will likely result in system lockouts or improper safety sequencing.
Item is Non Cancelable / Non Returnable
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.
