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Bard part 8406-107 is an OEM pressure switch used in Bard wall-mounted HVAC equipment to prove the correct pressure condition before allowing the unit to operate, helping protect the system and keep controls responding properly. This switch is set to open on fall at 0.42 in. WC with a +/- 0.05 in. WC tolerance, making it a common fit for airflow or draft sensing applications where the control circuit needs a dependable safety signal. If you are troubleshooting nuisance shutdowns, intermittent operation, or a pressure-related fault, replacing the switch with the correct Bard 8406-107 and verifying tubing and porting are clean and properly connected is the best way to restore reliable operation with the right OEM match.
* Orders less than $50 may incure a minimum order fee.