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Service Manual 308012En, Ed.1/Rev.D August 2010 DAU Display Rosemount Tank Radar Rex Chapter 6 Troubleshooting CAUSE ACTION Current input error (p for pressure): 2 - Internal calibration error Exchange PCB: DMB for Slave DAU or DXB for Independent DAU. Current input error (p for pressure): 3 - Old value in at least one value. Same cause as 1 above. See items under “Current input reading incorrect”. Output error (Independent DAU) Relay feedback does not match relay control. Exchange relay card, DRM. 6-7