Carrier HH18HA211 Rollout Switch What causes a primary limit

What causes a primary limit switch to trip repeatedly

Common Questions: What causes a furnace limit switch to trip repeatedly

The Robertshaw 1751-025 LP conversion kit is a precision-engineered solution for transitioning 722 Series gas valves from natural gas to liquid propane

Common Questions & Troubleshooting What does a #56 orifice size mean for my furnace

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)