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Bard part number 1804-0316BX is an OEM high pressure control assembly, commonly listed as a high pressure switch (flare), used in Bard wall-mount air conditioners and heat pumps to protect the refrigeration system by opening the control circuit if discharge pressure rises beyond the safe limit. When a unit is tripping on high head pressure, short cycling, or locking out during hot weather, replacing a weak or failed pressure control can help restore proper safety operation, but the underlying cause should still be corrected (airflow issues, dirty condenser coil, failed fan motor, refrigerant overcharge, or restrictions). Because this is a factory Bard replacement, it is built to match the original pressure rating and connection style for proper fit and reliable cutout and reset behavior when installed by a qualified HVAC technician.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.