Carrier HH12ZZ190 Limit Switch 321702-401 ensuring a secure fit without

ensuring a secure fit without the need for field modifications

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

Carrier HH12ZZ190 Limit Switch 321702-401 ensuring a secure fit withoutThe 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