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Bard part 8406-101 is an OEM DP3T toggle switch used in Bard wall mounted HVAC equipment to manually change operating modes or control functions by switching multiple circuits at once. When a unit has intermittent mode selection, will not stay in position, or the lever action feels loose or inconsistent, replacing the switch can restore reliable, positive control and help prevent nuisance operation issues. This is an electrical controls component intended to match Bard fit and wiring layouts, so confirm your unit model and wiring diagram before ordering and transfer wires one at a time to the same terminals during installation.