Lennox 99K63 Rollout Switch Using a bushing or force-fitting

Using a bushing or force-fitting the hub can lead to catastrophic failure

it provides the necessary phase shift for both the compressor and the condenser fan motor

The White-Rodgers 21D64-2 is a robust 120V silicon nitride ignitor upgrade kit engineered for high-durability performance in residential gas furnaces

Key Benefits: Genuine OEM part ensures direct compatibility with York

which leads to voltage leaking to the ground frame rather than reaching the burner assembly

Lennox 99K63 Rollout Switch Using a bushing or force-fittingThe Lennox 99K63 Rollout Switch is a critical safety component designed for precise thermal monitoring in residential and commercial gas furnaces. Engineered as a manual reset rollout switch, this part is calibrated to actuate at 250 degrees F (+ 12F), immediately interrupting the burner circuit if it detects flame rollout or excessive heat concentrations outside the combustion chamber. This OEM Lennox replacement part, also identified by part number