HP LaserJet Error 12 – Printer Open or No EP Cartridge

If you are receiving this message please take the following steps:

1. Fully open the top cover of the printer.
2. Remove the toner cartridge from the printer
3. Firmly re-install the toner cartridge.
4. Close the top cover of the printer ensuring noting obstructs it.
5. Check that the tab on the fuser access door above the multi-purpose tray (for envelopes etc) is not broken.
6. Examine the fan to ensure it is turning and not excessively dirty (if both are fine skip to step 11).
7. The fan can be accessed by removing the top cover and then the right cover.
8. Turn the printer off.
9. Ensure the fans electronic contacts are clean and all firmly connected.
10. Clean the fan if it is dirty.
11. If “Error 12” still shows then the please contact HP technical support if the machine is in warranty or a technician if the warranty has expired.