Carrier HH12HA142 Limit Switch

The Carrier HH12HA142 is a genuine OEM limit switch engineered for precision thermal protection in residential and commercial gas furnaces. This manual reset limit switch is factory-calibrated to trigger at a fixed temperature of 140°F (60°C), functioning as a critical safety cut-off that interrupts the heating circuit upon detecting an over-temperature condition. Constructed for high-cycle reliability in harsh furnace environments, the HH12HA142 features a Single Pole Single Throw (SPST) configuration and rugged high-temperature-resistant housing. Designed for direct compatibility with Carrier, Bryant, and Payne heating units, this 140F M/R limit switch ensures your equipment remains compliant with safety standards by requiring a manual physical reset after a trip, signaling a technician to inspect the system for airflow or combustion issues. Its compact form factor and standard mounting flange provide a seamless fit for field replacements, maintaining the original engineering specifications of the HVAC system.

• Precise 140°F Trip Point: Ensures accurate high-limit protection to prevent heat exchanger damage or fire hazards.
• Manual Reset Functionality: Provides a safer diagnostic fail-safe compared to auto-reset switches, forcing an assessment of the root cause of overheating.
• OEM Compatibility: Guaranteed fit for Carrier furnace parts, reducing installation time and eliminating the need for field modifications.
• Durable SPST Design: Built-to-spec electrical ratings of 15A at 125VAC ensure reliable switching performance throughout the service life of the furnace.

• Can this switch be used to replace a different temperature-rated limit? No; the 140°F rating is specific to the furnace's design and airflow requirements. Replacing it with a different rating can lead to premature failure or unsafe operating conditions.
• Why does my HH12HA142 keep tripping? Frequent trips usually indicate restricted airflow, such as a clogged filter, blocked return, or a failing blower motor, rather than a defect in the limit control itself.
• Is this compatible with 24V control circuits? Yes, this switch is designed to handle standard 24VAC control voltage as well as 120VAC applications within its rated current limits.

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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.