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Bard 1804-0106 is an OEM high pressure control assembly used in Bard wall-mounted air conditioners and heat pumps to monitor refrigerant discharge pressure and open the safety circuit if head pressure rises to an unsafe level. In the field, this control is commonly replaced when a unit is nuisance-tripping on high pressure, has a failed or drifting switch, or needs a like-for-like safety component during a compressor or condenser service repair. Using the correct Bard factory part helps maintain proper unit protection logic and reliable operation, so always confirm the part number against the unit model and serial information before ordering.