• Code: 13.XX.XX
• Display: 13.XX.YY JAM INSIDE REAR DOOR
• Description: A jam has occurred in the duplex reversing area.
• Remedy: 1. Press "down" to see step-by-step information. 2. Open the rear door, and then remove all media found. 3. Close the rear door. 4. Open and close the cartridge door to clear the error message.

• Code: 13.XX.XX
• Display: 13.XX.YY JAM INSIDE TOP COVER
• Description: A jam has occurred in the registration assembly area.
• Remedy: 1. Press "down" the to see step-by-step information. 2. Open the cartridge door, and then remove the print cartridge. 3. Remove all media found. 4. Lift the metal flap, and then remove any media remaining. 5. Reinstall the print cartridge, and then close the cartridge door. 6. If the message persists, verify that the flat ribbon cable at the bottom of the ECU is connected correctly. 7. To exit, press ?

• Code: 20
• Display: 20-INSUFFICIENT MEMORY
• Description: The device has received more data from the computer than fits in available memory.
• Remedy: 1. Press "OK" to continue printing. 2. Reduce the complexity of the print job to avoid this error. 3. Adding memory to the device may allow printing of more complex pages.

• Code: 21
• Display: 21 PAGE TOO COMPLEX
• Description: The page-compression process is too slow for the device. Some data may be lost on the page.
• Remedy: 1. Press "down" to see step-by-step information. 2. To print the job with some data loss, press " OK" to exit the message, and then press . If data is lost, simplify the page content to reduce its complexity. 3. To exit, press ?

• Code: 22
• Display: 22-EIO X BUFFER OVERFLOW
• Description: For devices with an EIO device only. The device EIO card in slot X has overflowed its I/O buffer during a busy state.
• Remedy: 1. Press "OK" to continue printing. 2. If the message persists, contact HP Support.

• Code: 22
• Display: 22-EMBEDDED I/O BUFFER OVERFLOW
• Description: The embedded HP Jetdirect print server buffer has overflowed during a busy state.
• Remedy: 1. Press "OK" to continue printing. 2. If the message persists, contact HP Support.

• Code: 22
• Display: 22-PARALLEL I/O BUFFER OVERFLOW
• Description: The device parallel buffer has overflowed during a busy state.
• Remedy: 1. Press "OK" to continue printing. 2. If the message persists, contact HP Support.

• Code: 22
• Display: 22-SERIAL I/O BUFFER OVERFLOW
• Description: The device serial buffer has overflowed during a busy state.
• Remedy: 1. Press "OK" to continue printing. 2. If the message persists, contact HP Support.