Carrier HH18HA304 Limit Switch
The Carrier HH18HA304 Limit Switch is a critical safety component designed for precise thermal monitoring in residential gas furnaces and air handlers. Engineered as a L55F-22 furnace limit switch, this normally closed (NC) sensor features a 55-degree Fahrenheit fixed temperature trip point with a 22-degree differential for automatic reset. This OEM replacement ensures the furnace high limit switch maintains the heat exchanger within safe operating parameters, preventing overheating and potential component failure. It is important for technicians to note that the HH18HA304 is identical to HH18HA304A, offering seamless backward compatibility across various Carrier, Bryant, and Payne platforms. When troubleshooting HVAC rollout switch issues or localized overheating, this 3/4-inch surface mount thermal disc provides the reliable bimetallic response required for Carrier furnace repair. This genuine OEM HVAC replacement part ensures millivolt and 24V circuit integrity, maintaining system uptime and safety compliance.
Item is Non Cancelable / Non Returnable
- Factory Calibrated Precision: Features a fixed 55°F open temperature and 22°F reset differential for accurate thermal protection.
- Direct OEM Compatibility: Serves as the official HH18HA304 replacement, including the HH18HA304A model variant.
- Engineered Safety: Prevents heat exchanger damage by interrupting the gas valve circuit if airflow is restricted or temperatures exceed design limits.
- Standardized Housing: Utilizes a universal 3/4-inch thermal disc configuration for fast mounting on the plenum or inducer housing.
Common Questions
What causes a Carrier HH18HA304 limit switch to trip frequently?
Repeated tripping is usually indicative of restricted airflow. Check for a dirty air filter, blocked return air grilles, or a failing blower motor. If the switch remains open while the unit is cool, the internal bimetallic disc has failed and requires replacement.
Is the HH18HA304 compatible with the HH18HA304A?
Yes, these two part numbers are functionally and physically identical. The HH18HA304 is the direct service replacement for all HH18HA304A applications in Carrier and ICP equipment.
Can I bypass this switch for testing purposes?
Bypassing a safety limit is strictly for temporary diagnostic continuity testing by a qualified technician. Never leave a jumper in place during operation, as this removes the secondary safety protection for the heat exchanger.
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: $26.92
-65%$26.92
$9.42Carrier HH18HA304 Limit Switch
The Carrier HH18HA304 Limit Switch is a critical safety component designed for precise thermal monitoring in residential gas furnaces and air handlers. Engineered as a L55F-22 furnace limit switch, this normally closed (NC) sensor features a 55-degree Fahrenheit fixed temperature trip point with a 22-degree differential for automatic reset. This OEM replacement ensures the furnace high limit switch maintains the heat exchanger within safe operating parameters, preventing overheating and potential component failure. It is important for technicians to note that the HH18HA304 is identical to HH18HA304A, offering seamless backward compatibility across various Carrier, Bryant, and Payne platforms. When troubleshooting HVAC rollout switch issues or localized overheating, this 3/4-inch surface mount thermal disc provides the reliable bimetallic response required for Carrier furnace repair. This genuine OEM HVAC replacement part ensures millivolt and 24V circuit integrity, maintaining system uptime and safety compliance.
Item is Non Cancelable / Non Returnable
- Factory Calibrated Precision: Features a fixed 55°F open temperature and 22°F reset differential for accurate thermal protection.
- Direct OEM Compatibility: Serves as the official HH18HA304 replacement, including the HH18HA304A model variant.
- Engineered Safety: Prevents heat exchanger damage by interrupting the gas valve circuit if airflow is restricted or temperatures exceed design limits.
- Standardized Housing: Utilizes a universal 3/4-inch thermal disc configuration for fast mounting on the plenum or inducer housing.
Common Questions
What causes a Carrier HH18HA304 limit switch to trip frequently?
Repeated tripping is usually indicative of restricted airflow. Check for a dirty air filter, blocked return air grilles, or a failing blower motor. If the switch remains open while the unit is cool, the internal bimetallic disc has failed and requires replacement.
Is the HH18HA304 compatible with the HH18HA304A?
Yes, these two part numbers are functionally and physically identical. The HH18HA304 is the direct service replacement for all HH18HA304A applications in Carrier and ICP equipment.
Can I bypass this switch for testing purposes?
Bypassing a safety limit is strictly for temporary diagnostic continuity testing by a qualified technician. Never leave a jumper in place during operation, as this removes the secondary safety protection for the heat exchanger.
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 HH18HA304 Limit Switch is a critical safety component designed for precise thermal monitoring in residential gas furnaces and air handlers. Engineered as a L55F-22 furnace limit switch, this normally closed (NC) sensor features a 55-degree Fahrenheit fixed temperature trip point with a 22-degree differential for automatic reset. This OEM replacement ensures the furnace high limit switch maintains the heat exchanger within safe operating parameters, preventing overheating and potential component failure. It is important for technicians to note that the HH18HA304 is identical to HH18HA304A, offering seamless backward compatibility across various Carrier, Bryant, and Payne platforms. When troubleshooting HVAC rollout switch issues or localized overheating, this 3/4-inch surface mount thermal disc provides the reliable bimetallic response required for Carrier furnace repair. This genuine OEM HVAC replacement part ensures millivolt and 24V circuit integrity, maintaining system uptime and safety compliance.
Item is Non Cancelable / Non Returnable
- Factory Calibrated Precision: Features a fixed 55°F open temperature and 22°F reset differential for accurate thermal protection.
- Direct OEM Compatibility: Serves as the official HH18HA304 replacement, including the HH18HA304A model variant.
- Engineered Safety: Prevents heat exchanger damage by interrupting the gas valve circuit if airflow is restricted or temperatures exceed design limits.
- Standardized Housing: Utilizes a universal 3/4-inch thermal disc configuration for fast mounting on the plenum or inducer housing.
Common Questions
What causes a Carrier HH18HA304 limit switch to trip frequently?
Repeated tripping is usually indicative of restricted airflow. Check for a dirty air filter, blocked return air grilles, or a failing blower motor. If the switch remains open while the unit is cool, the internal bimetallic disc has failed and requires replacement.
Is the HH18HA304 compatible with the HH18HA304A?
Yes, these two part numbers are functionally and physically identical. The HH18HA304 is the direct service replacement for all HH18HA304A applications in Carrier and ICP equipment.
Can I bypass this switch for testing purposes?
Bypassing a safety limit is strictly for temporary diagnostic continuity testing by a qualified technician. Never leave a jumper in place during operation, as this removes the secondary safety protection for the heat exchanger.
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.
