How do I know if the overload is the point of failure

This limit switch is typically mounted on the furnace plenum or blower housing

meaning the timing period begins the moment the control circuit is de-energized

While designed for Carrier Corporation equipment

Auburn FI21500 Spark Plug 320788-702 How do I know ifThe Auburn FI21500 Spark Plug is a high performance industrial ignition electrode designed for demanding heating and combustion systems. This OEM spark plug, which is technically identical to the BM6043 model, provides the consistent ignition performance required to maintain peak combustion efficiency in commercial furnaces and boilers. Engineered to withstand high thermal environments, the Auburn FI21500 ensures reliable starts and reduces downtime