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• 8406-023 OBSOLETE

• DOOR INTERLOCK SWITCH

The Bard 8406-023 door interlock switch is an OEM safety control that confirms the access door is properly closed before allowing the unit to run, helping protect service personnel and preventing operation with panels open. This switch is used in Bard wall-mounted HVAC equipment where the control circuit relies on a positive door-closed signal for normal operation. If your unit will not start after servicing, trips intermittently, or shows a door or access fault, replacing the interlock switch with the correct Bard 8406-023 part helps restore proper safety sequencing and reliable system enable operation. Match by full Bard part number and unit model/serial to ensure correct fit and wiring style.