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The Bard 1804-0316 is an OEM high pressure control assembly used in Bard wall mounted air conditioners and heat pump units to protect the refrigeration system during abnormal high head pressure conditions. When system pressure rises beyond safe limits, this switch opens the control circuit to shut the unit down and help prevent compressor damage, making it a key safety and reliability component during demanding outdoor conditions. If your Bard unit is tripping on high pressure or you are replacing a failed switch during service, using the correct Bard 1804-0316 helps ensure proper pressure cutout operation and dependable fit with the factory refrigerant connection style specified for this part.