Carrier HH18HA137 Limit Switch
The Carrier HH18HA137 Limit Switch is a critical safety component designed for precise thermal monitoring within furnace heat exchangers. This OEM Carrier replacement part features an automatic reset mechanism with a cutout temperature of 130°F and a cut-in differential at 90°F. Engineered for high-cycle reliability, the HH18HA137 limit control ensures the blower motor and burner assembly operate within safe thermal parameters, preventing structural damage to the heat exchanger during restricted airflow conditions. As a fixed temperature limit switch, it provides a normally closed circuit that opens upon reaching its thermal setpoint. This component is essential for maintaining the sequence of operation in Carrier, Bryant, and Payne HVAC systems. Installation requires standard 1/4-inch spade terminals, making it a direct-fit solution for field service technicians troubleshooting high-limit trip errors or intermittent furnace cycling issues.
Key Benefits- Precise Thermal Calibration: Calibrated for a 130-degree trip point to ensure furnace safety compliance.
- Automatic Reset Logic: Automatically closes the circuit at 90°F, reducing unnecessary service calls for manual resets.
- OEM Compatibility: Guaranteed fit for specific Carrier induced-combustion furnaces and air handlers.
- Durable Construction: Designed to withstand the high-temperature environment of the heat exchanger plenum.
What causes a Carrier HH18HA137 to trip frequently?
Repeated tripping typically indicates restricted airflow across the heat exchanger, often caused by a dirty HVAC filter, blocked return air ducts, or a failing blower motor.
Is the HH18HA137 interchangeable with other limit switches?
While other switches may have similar 130-90 logic, you must use the HH18HA137 OEM part to ensure the mounting depth and thermal response time match the furnace's original engineering specifications.
How do I test this limit switch for continuity?
Disconnect power and remove the leads. Use a multimeter set to Ohms; at room temperature, the switch should show zero resistance (normally closed). If it is open at room temperature, the internal bimetal disc has failed.
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: $36.11
-65%$36.11
$12.64Carrier HH18HA137 Limit Switch
The Carrier HH18HA137 Limit Switch is a critical safety component designed for precise thermal monitoring within furnace heat exchangers. This OEM Carrier replacement part features an automatic reset mechanism with a cutout temperature of 130°F and a cut-in differential at 90°F. Engineered for high-cycle reliability, the HH18HA137 limit control ensures the blower motor and burner assembly operate within safe thermal parameters, preventing structural damage to the heat exchanger during restricted airflow conditions. As a fixed temperature limit switch, it provides a normally closed circuit that opens upon reaching its thermal setpoint. This component is essential for maintaining the sequence of operation in Carrier, Bryant, and Payne HVAC systems. Installation requires standard 1/4-inch spade terminals, making it a direct-fit solution for field service technicians troubleshooting high-limit trip errors or intermittent furnace cycling issues.
Key Benefits- Precise Thermal Calibration: Calibrated for a 130-degree trip point to ensure furnace safety compliance.
- Automatic Reset Logic: Automatically closes the circuit at 90°F, reducing unnecessary service calls for manual resets.
- OEM Compatibility: Guaranteed fit for specific Carrier induced-combustion furnaces and air handlers.
- Durable Construction: Designed to withstand the high-temperature environment of the heat exchanger plenum.
What causes a Carrier HH18HA137 to trip frequently?
Repeated tripping typically indicates restricted airflow across the heat exchanger, often caused by a dirty HVAC filter, blocked return air ducts, or a failing blower motor.
Is the HH18HA137 interchangeable with other limit switches?
While other switches may have similar 130-90 logic, you must use the HH18HA137 OEM part to ensure the mounting depth and thermal response time match the furnace's original engineering specifications.
How do I test this limit switch for continuity?
Disconnect power and remove the leads. Use a multimeter set to Ohms; at room temperature, the switch should show zero resistance (normally closed). If it is open at room temperature, the internal bimetal disc has failed.
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 HH18HA137 Limit Switch is a critical safety component designed for precise thermal monitoring within furnace heat exchangers. This OEM Carrier replacement part features an automatic reset mechanism with a cutout temperature of 130°F and a cut-in differential at 90°F. Engineered for high-cycle reliability, the HH18HA137 limit control ensures the blower motor and burner assembly operate within safe thermal parameters, preventing structural damage to the heat exchanger during restricted airflow conditions. As a fixed temperature limit switch, it provides a normally closed circuit that opens upon reaching its thermal setpoint. This component is essential for maintaining the sequence of operation in Carrier, Bryant, and Payne HVAC systems. Installation requires standard 1/4-inch spade terminals, making it a direct-fit solution for field service technicians troubleshooting high-limit trip errors or intermittent furnace cycling issues.
Key Benefits- Precise Thermal Calibration: Calibrated for a 130-degree trip point to ensure furnace safety compliance.
- Automatic Reset Logic: Automatically closes the circuit at 90°F, reducing unnecessary service calls for manual resets.
- OEM Compatibility: Guaranteed fit for specific Carrier induced-combustion furnaces and air handlers.
- Durable Construction: Designed to withstand the high-temperature environment of the heat exchanger plenum.
What causes a Carrier HH18HA137 to trip frequently?
Repeated tripping typically indicates restricted airflow across the heat exchanger, often caused by a dirty HVAC filter, blocked return air ducts, or a failing blower motor.
Is the HH18HA137 interchangeable with other limit switches?
While other switches may have similar 130-90 logic, you must use the HH18HA137 OEM part to ensure the mounting depth and thermal response time match the furnace's original engineering specifications.
How do I test this limit switch for continuity?
Disconnect power and remove the leads. Use a multimeter set to Ohms; at room temperature, the switch should show zero resistance (normally closed). If it is open at room temperature, the internal bimetal disc has failed.
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.
