Carrier HH18HA497 Limit Switch
The Carrier HH18HA497 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and commercial furnaces. As a genuine OEM replacement part, this 190 degree open limit switch is engineered to open the electrical circuit when the heat exchanger cabinet reaches its maximum safety threshold, preventing equipment damage and hazardous conditions. When the temperature drops to the 150 degree close setpoint, the switch resets, allowing the heating cycle to resume.
For technicians troubleshooting Carrier furnace limit switch issues, the HH18HA497 provides the exact calibration required to maintain factory airflow specifications and ignition sequences. Using an HVAC high limit control with these specific 190/150 settings ensures compatibility with the original system design, avoiding premature tripping or delayed safety responses often found with generic alternatives. This component is essential for protecting the furnace heat exchanger from thermal stress and ensuring long-term system reliability.
Key Benefits:
- System Safety: Prevents furnace overheating by accurately monitoring discharge air and heat exchanger temperatures.
- OEM Reliability: Guaranteed Carrier HH18HA497 specifications match the original internal resistance and mounting footprint.
- Direct Compatibility: Designed for seamless integration into Carrier, Bryant, and Day & Night equipment.
- Automatic Reset: Features a bimetal disc that automatically resets at 150°F to resume normal operation after a high-heat event.
Common Questions:
What causes a Carrier limit switch to trip repeatedly?
Repeated tripping of the HH18HA497 is typically caused by restricted airflow. Technicians should inspect for dirty filters, blocked return ducts, a failing blower motor, or a clogged evaporator coil.
Can I bypass this switch for testing purposes?
While a jumper may be used momentarily for diagnostic continuity testing, the switch must never be bypassed during permanent operation. This HVAC safety switch is the primary defense against heat exchanger failure.
How do I verify the HH18HA497 is faulty?
Confirm the switch shows continuity when cold (below 150°F). If the circuit is open at room temperature, the internal bimetal disc or contacts have failed and the unit requires replacement.
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: $9.83
-65%$9.83
$3.44Carrier HH18HA497 Limit Switch
The Carrier HH18HA497 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and commercial furnaces. As a genuine OEM replacement part, this 190 degree open limit switch is engineered to open the electrical circuit when the heat exchanger cabinet reaches its maximum safety threshold, preventing equipment damage and hazardous conditions. When the temperature drops to the 150 degree close setpoint, the switch resets, allowing the heating cycle to resume.
For technicians troubleshooting Carrier furnace limit switch issues, the HH18HA497 provides the exact calibration required to maintain factory airflow specifications and ignition sequences. Using an HVAC high limit control with these specific 190/150 settings ensures compatibility with the original system design, avoiding premature tripping or delayed safety responses often found with generic alternatives. This component is essential for protecting the furnace heat exchanger from thermal stress and ensuring long-term system reliability.
Key Benefits:
- System Safety: Prevents furnace overheating by accurately monitoring discharge air and heat exchanger temperatures.
- OEM Reliability: Guaranteed Carrier HH18HA497 specifications match the original internal resistance and mounting footprint.
- Direct Compatibility: Designed for seamless integration into Carrier, Bryant, and Day & Night equipment.
- Automatic Reset: Features a bimetal disc that automatically resets at 150°F to resume normal operation after a high-heat event.
Common Questions:
What causes a Carrier limit switch to trip repeatedly?
Repeated tripping of the HH18HA497 is typically caused by restricted airflow. Technicians should inspect for dirty filters, blocked return ducts, a failing blower motor, or a clogged evaporator coil.
Can I bypass this switch for testing purposes?
While a jumper may be used momentarily for diagnostic continuity testing, the switch must never be bypassed during permanent operation. This HVAC safety switch is the primary defense against heat exchanger failure.
How do I verify the HH18HA497 is faulty?
Confirm the switch shows continuity when cold (below 150°F). If the circuit is open at room temperature, the internal bimetal disc or contacts have failed and the unit requires replacement.
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
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Description
The Carrier HH18HA497 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and commercial furnaces. As a genuine OEM replacement part, this 190 degree open limit switch is engineered to open the electrical circuit when the heat exchanger cabinet reaches its maximum safety threshold, preventing equipment damage and hazardous conditions. When the temperature drops to the 150 degree close setpoint, the switch resets, allowing the heating cycle to resume.
For technicians troubleshooting Carrier furnace limit switch issues, the HH18HA497 provides the exact calibration required to maintain factory airflow specifications and ignition sequences. Using an HVAC high limit control with these specific 190/150 settings ensures compatibility with the original system design, avoiding premature tripping or delayed safety responses often found with generic alternatives. This component is essential for protecting the furnace heat exchanger from thermal stress and ensuring long-term system reliability.
Key Benefits:
- System Safety: Prevents furnace overheating by accurately monitoring discharge air and heat exchanger temperatures.
- OEM Reliability: Guaranteed Carrier HH18HA497 specifications match the original internal resistance and mounting footprint.
- Direct Compatibility: Designed for seamless integration into Carrier, Bryant, and Day & Night equipment.
- Automatic Reset: Features a bimetal disc that automatically resets at 150°F to resume normal operation after a high-heat event.
Common Questions:
What causes a Carrier limit switch to trip repeatedly?
Repeated tripping of the HH18HA497 is typically caused by restricted airflow. Technicians should inspect for dirty filters, blocked return ducts, a failing blower motor, or a clogged evaporator coil.
Can I bypass this switch for testing purposes?
While a jumper may be used momentarily for diagnostic continuity testing, the switch must never be bypassed during permanent operation. This HVAC safety switch is the primary defense against heat exchanger failure.
How do I verify the HH18HA497 is faulty?
Confirm the switch shows continuity when cold (below 150°F). If the circuit is open at room temperature, the internal bimetal disc or contacts have failed and the unit requires replacement.
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.
