Carrier HH12ZZ190 Limit Switch 321702-401 this genuine ServiceFirst part ensures

this genuine ServiceFirst part ensures full compatibility with existing 3-phase electrical configurations

technicians should inspect the burner plate insulation for cracks or degradation to prevent heat bypass

This is a three-phase motor and requires a 3-phase power supply (200-460V)

this OEM replacement transformer ensures impedance-protected operation to shield downstream low-voltage components from damage

6-inch motor diameter

Carrier HH12ZZ190 Limit Switch 321702-401 this genuine ServiceFirst part ensuresThe Carrier HH12ZZ190 Limit Switch is a critical safety component designed for precise thermal monitoring in residential gas furnaces. Engineered as a normally closed (NC) high limit control, this genuine OEM replacement part features a 190F fixed set point and a 40F differential. This means the circuit opens on a temperature rise at 190F to prevent heat exchanger damage and automatically resets when the temperature drops to 150F. Reliable thermal