-Check that the cable from the Ink Supply Station (ISS) PCA to the Ink Supply Station is correctly connected.
-Check that the Air Pressurization System Sensor Cable is correctly connected and is NOT damaged.
-Check all the tubes of the APS and make sure they are NOT pinched or damaged.
-Faulty APS. Replace the APS (See Air Pressurization System (APS)).
-If the error code continues, replace the Main PCA.