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8406-021 OBSOLETE
- PRESSURE SWITCH .45" W.C.
Bard part number 8406-021 is an OEM air pressure switch set to 0.45 in. W.C. that is used to prove proper draft and airflow in compatible Bard wall mounted HVAC equipment before the unit is allowed to operate. When this switch is weak, stuck, or out of calibration, it can cause nuisance lockouts or prevent safe startup, so replacing it with the correct factory-rated switch helps restore reliable safeties and normal heating operation. Match the pressure rating and confirm the part number against your Bard model and serial tag or the unit parts list to ensure proper fit and correct hose and wiring connections.
Official replacement(s):
8406-074
- Pressure Switch .45" Wc -Boxed