Description
The Carrier HH19ZA145 is an OEM furnace limit switch engineered to protect heating systems from dangerous overtemperature conditions. Designed as a direct replacement for Carrier furnaces and air handlers, this limit switch automatically opens the circuit at 145°F to shut down the burner or heat source when temperatures exceed safe operating levels, then resets (closes) at 105°F once the system has cooled to a safe temperature — preventing nuisance lockouts while maintaining reliable overheat protection.
Limit switches are a critical safety component in forced-air furnaces. When airflow is restricted, a heat exchanger overheats, or a blower motor fails, the limit switch acts as the last line of defense — cutting power to the burner before damage or hazard can occur. The HH19ZA145 is built to Carrier OEM specifications, ensuring a precise fit and dependable performance in the field.
Key Specifications
- Brand: Carrier
- Part Number: HH19ZA145
- Type: Furnace Limit Switch
- Opens (Trip Temperature): 145°F
- Closes (Reset Temperature): 105°F
- OEM Direct Replacement
Features & Benefits
- Automatic reset design — closes at 105°F for reliable, repeatable operation
- Protects heat exchangers and furnace components from overtemperature damage
- OEM Carrier part for guaranteed compatibility and fit
- Essential safety control for forced-air furnaces and air handlers
- Helps maintain system efficiency by ensuring proper burner shutoff under fault conditions
Applications
- Carrier forced-air furnaces
- Residential and light commercial heating systems
- Direct OEM replacement for failed or suspect limit switches
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