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8406-039 OBSOLETE
- PRESSURE SWITCH .35" W.C.
The Bard 8406-039 pressure switch is an OEM air pressure proving switch set for 0.35 in. water column, used to confirm proper airflow or draft before the unit allows ignition or key system functions to continue. On Bard wall mounted HVAC equipment, this switch helps protect the system by opening or closing its contacts when the correct pressure is present, reducing nuisance shutdowns and preventing unsafe operation caused by blocked vents, dirty filters, or failing inducer and blower performance. If you are troubleshooting intermittent lockouts or airflow related fault codes, replacing the switch with the correct Bard 8406-039 and verifying the tubing and port are clear is a common, practical repair to restore normal operation and correct safety sequencing.
Official replacement(s):
8406-073
- Pressure Switch .35" WC