Performed heating maintenance on a 2021 Trane S9V2 96% efficient two stage natural gas furnace Cleaned Trane CleanEffects electronic air cleaner (pre filter, control electrode grid, and collection cells) Reset filter indicator Pulled and cleaned flame sensor Removed all the burners and cleaned with a wire brush Removed condensate trap and flushed with hot water High fire gas pressure 3.5"wc Low fire gas pressure 1.7"wc