Seems like if the furnace ever worked someone had to manually throw that switch. It is there to disable the furnace if you are working on it?
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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