Carrier HH12ZZ190 Limit Switch R-22 preventing the system hunting and

preventing the system hunting and airflow imbalances common with universal alternatives

or improper gas pressure causing flames to "roll out" of the combustion chamber

High Output Performance: Provides a steady 750 millivolt signal to effectively power independent gas control circuits without external electricity

though upright is preferred to prevent sediment buildup

Carrier HH12ZZ190 Limit Switch R-22 preventing the system hunting andThe 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