identifying it specifically as the FP1 (Freeze Protection 1) sensor

the board utilizes demand defrost logic

such as the SA159-24

System Protection: Continuously monitors limit switches and flame signals to prevent unsafe furnace operation

The Fenwal 35-705501-105 is a 120V Direct Spark Ignition (DSI) control specifically engineered for high-demand gas-fired equipment

Sterling 11J35R04581 Inducer Assembly R-410A identifying it specifically as theThe Sterling 11J35R04581 Inducer Assembly is a critical combustion blower component designed specifically for Sterling HVAC unit heaters and GG TF series furnaces. This draft inducer motor assembly manages the exhaust process by pulling air through the heat exchanger and venting flue gases safely out of the system. Operating on standard 115V 60Hz single phase power, the 11J35R04581 features a precision balanced impeller to minimize vibration and