Carrier HH18HA211 Rollout Switch What causes a primary limit

What causes a primary limit switch to trip repeatedly

Industry Standard Performance: Handles high inrush currents typical of inductive motor starts without premature contact pitting

preventing issues like under-firing or hazardous incomplete combustion in residential and light commercial units

If the internal element melts due to excessive heat

monitoring internal plenum temperatures to prevent heat exchanger damage or unsafe operating conditions

Carrier HH18HA211 Rollout Switch What causes a primary limitThe Carrier HH18HA211 Rollout Switch is a critical safety component designed for Carrier, Bryant, and Payne furnaces and packaged units. As a high limit safety device, it monitors for flame rollout conditionswhere burner flames escape the combustion chamberand immediately interrupts the 24V control circuit to prevent equipment damage or fire hazards. This OEM replacement part features a snap disc design with a Single Pole Single Throw (SPST)