Carrier HH18HA465 Limit Switch
The Carrier HH18HA465 is a high-precision automatic reset limit switch designed for critical thermal protection in Carrier, Bryant, and Payne furnace applications. Operating as a normally closed switch, this safety component opens the circuit at a fixed high-limit temperature of 165°F and automatically resets once the induction air temperature drops back to 100°F. Engineered for high-cycle reliability, the HH18HA465 prevents heat exchanger damage caused by restricted airflow or blower motor failure. This OEM replacement rollout switch features standard 1/4-inch terminals for seamless integration into existing HVAC wiring harnesses. Technicians must verify the temperature differential and part number prefix to ensure proper furnace safety circuit operation. This robust HVAC limit control is essential for maintaining UL compliance and ensuring the furnace flame sensor and gas valve operate within safe thermal parameters during peak demand.
Key Benefits- Precise Thermal Calibration: Fixed 165°F trip point ensures rapid circuit interruption to prevent excessive heat exchanger stress.
- Automatic Reset Logic: Resets at 100°F, allowing for streamlined system recovery without manual intervention after the unit cools.
- OEM Compatibility: Exact drop-in replacement for Carrier HH18HA465, eliminating the need for bracket modifications or field adjustments.
- Industrial Build Quality: Constructed to withstand the high-temperature environment of a furnace burner tray or transition duct.
What causes a Carrier HH18HA465 to trip frequently?
Repeated tripping is usually indicative of restricted airflow, often caused by a dirty air filter, blocked return vents, or a failing blower capacitor.
Can I use a manual reset switch to replace this HH18HA465?
No. This is an automatic reset control. Replacing it with a manual reset switch could lead to system lockouts and is not recommended unless specified by the manufacturer's wiring diagram.
How do I test the continuity of this limit switch?
With power disconnected and wires removed, use a multimeter on the ohms setting. At room temperature, this switch should show near-zero resistance (closed circuit).
Note: 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.
Original: $13.92
-65%$13.92
$4.87Carrier HH18HA465 Limit Switch
The Carrier HH18HA465 is a high-precision automatic reset limit switch designed for critical thermal protection in Carrier, Bryant, and Payne furnace applications. Operating as a normally closed switch, this safety component opens the circuit at a fixed high-limit temperature of 165°F and automatically resets once the induction air temperature drops back to 100°F. Engineered for high-cycle reliability, the HH18HA465 prevents heat exchanger damage caused by restricted airflow or blower motor failure. This OEM replacement rollout switch features standard 1/4-inch terminals for seamless integration into existing HVAC wiring harnesses. Technicians must verify the temperature differential and part number prefix to ensure proper furnace safety circuit operation. This robust HVAC limit control is essential for maintaining UL compliance and ensuring the furnace flame sensor and gas valve operate within safe thermal parameters during peak demand.
Key Benefits- Precise Thermal Calibration: Fixed 165°F trip point ensures rapid circuit interruption to prevent excessive heat exchanger stress.
- Automatic Reset Logic: Resets at 100°F, allowing for streamlined system recovery without manual intervention after the unit cools.
- OEM Compatibility: Exact drop-in replacement for Carrier HH18HA465, eliminating the need for bracket modifications or field adjustments.
- Industrial Build Quality: Constructed to withstand the high-temperature environment of a furnace burner tray or transition duct.
What causes a Carrier HH18HA465 to trip frequently?
Repeated tripping is usually indicative of restricted airflow, often caused by a dirty air filter, blocked return vents, or a failing blower capacitor.
Can I use a manual reset switch to replace this HH18HA465?
No. This is an automatic reset control. Replacing it with a manual reset switch could lead to system lockouts and is not recommended unless specified by the manufacturer's wiring diagram.
How do I test the continuity of this limit switch?
With power disconnected and wires removed, use a multimeter on the ohms setting. At room temperature, this switch should show near-zero resistance (closed circuit).
Note: 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.
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Description
The Carrier HH18HA465 is a high-precision automatic reset limit switch designed for critical thermal protection in Carrier, Bryant, and Payne furnace applications. Operating as a normally closed switch, this safety component opens the circuit at a fixed high-limit temperature of 165°F and automatically resets once the induction air temperature drops back to 100°F. Engineered for high-cycle reliability, the HH18HA465 prevents heat exchanger damage caused by restricted airflow or blower motor failure. This OEM replacement rollout switch features standard 1/4-inch terminals for seamless integration into existing HVAC wiring harnesses. Technicians must verify the temperature differential and part number prefix to ensure proper furnace safety circuit operation. This robust HVAC limit control is essential for maintaining UL compliance and ensuring the furnace flame sensor and gas valve operate within safe thermal parameters during peak demand.
Key Benefits- Precise Thermal Calibration: Fixed 165°F trip point ensures rapid circuit interruption to prevent excessive heat exchanger stress.
- Automatic Reset Logic: Resets at 100°F, allowing for streamlined system recovery without manual intervention after the unit cools.
- OEM Compatibility: Exact drop-in replacement for Carrier HH18HA465, eliminating the need for bracket modifications or field adjustments.
- Industrial Build Quality: Constructed to withstand the high-temperature environment of a furnace burner tray or transition duct.
What causes a Carrier HH18HA465 to trip frequently?
Repeated tripping is usually indicative of restricted airflow, often caused by a dirty air filter, blocked return vents, or a failing blower capacitor.
Can I use a manual reset switch to replace this HH18HA465?
No. This is an automatic reset control. Replacing it with a manual reset switch could lead to system lockouts and is not recommended unless specified by the manufacturer's wiring diagram.
How do I test the continuity of this limit switch?
With power disconnected and wires removed, use a multimeter on the ohms setting. At room temperature, this switch should show near-zero resistance (closed circuit).
Note: 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.
