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8406-059 OBSOLETE
- DIFF. PRES. SW. .88" W.C. PF
The Bard 8406-059 differential pressure switch is an OEM safety and proving control used to verify proper airflow or draft conditions before allowing the unit to operate. Rated at 0.88 in. w.c. (water column), this switch helps the control system confirm the required pressure differential is present, which can prevent nuisance lockouts and protect critical components when airflow is restricted. If you are troubleshooting intermittent shutdowns, pressure-related faults, or a unit that will not complete its start sequence, replacing a weak or out-of-calibration switch with the correct Bard 8406-059 part helps restore reliable operation and proper safety interlocks, but always confirm setpoint and tubing/port routing against your specific Bard model and service literature before installation.
Official replacement(s):
8406-078
- Diff. Press. Sw. .38" Open On Fall