The target pressure cannot be achieved after the Pressure motor has driven for a predetermined time period (40 seconds). The home position of the Pressure pump cannot be detected because the ridges of the accordion unit are adhered to each other, or the Pressure pump home sensor is broken.
Check junction of the ink cartridge and the ink cartridge holder and remove any obstruction between them if any. Replace the ink cartridge. Replace the pressure pump (PURESSURE, PUMP, ASSY). Replace the main board (MAIN BOARD ASSY).