Carrier HH12ZZ190 Limit Switch 321702-401 technicians should inspect the burner

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

or spark igniter must be purchased separately if they require replacement

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

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

enhancing safety and system reliability

Carrier HH12ZZ190 Limit Switch 321702-401 technicians should inspect the burnerThe 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