Carrier HH19ZA125 Limit Switch 321894-708 This is an automatic reset

This is an automatic reset control

and sleeves

The 22W04 is designed to activate the blower circuit

Always verify your specific boiler serial number and section assembly drawing before proceeding

Simplified Wiring: Features clearly labeled terminals and LED status LEDs for each zone to verify thermostat calls and damper positions instantly

Carrier HH19ZA125 Limit Switch 321894-708 This is an automatic resetThe Carrier HH19ZA125 Limit Switch provides critical thermal monitoring for residential and commercial heating systems. This OEM Carrier replacement part is engineered to open the electrical circuit when the internal temperature reaches 125F, effectively preventing the heat exchanger from exceeding safe operating limits. Classified as an L125 35F limit control, the switch features an automatic reset mechanism that closes the circuit once the system