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Do you mean "unable to clean"?If it this follow this instruction. Unplug the printer from power cord.Press and hold the "menu" button, then plug the device.You'll see on the LCD screen a "machine error" code.If this code is 40,41 or 4F the print head is defective.If the error is 50 or 51 there is error in Purge unit and printer require service.If the error is 46 the waste ink tank is full.Follow this:Enter 80, then scroll down with the arrow down (round) key. You'll find an entry listed as purge count. If numberis over 6000, enter 2 7 8 3.This will reset the purge count value. Then restart the printer, hopefully without the annoying cannot clean message.
Error 41 means there is a major problem with the printhead, usually requires a print head replacement. My advice is to take it to a Brother service centre while if it is under warranty. If it's out of warranty they are usually a throw away job, the heads cost as much as the printer. Sorry I know what it feels like, just have a go and see what you can do, clean the heads and so on. All the Best and good luck: Pineworks
My MFC 665CW popped this same "Unable To Print 4F" error recently making the machine fully useless. Just an annoying triple beep and repeat error message to screen when trying to do anything at all with it. I wrote Brother about it. They said to check all through the machine (with a light) for any paper torn off inside, or unwanted foreign objects. This is a good step to do anyway to help maintain the printer. If that is not it, they said it would be a mechanical malfunction. I tried "resetting" by unplugging it for a while as they suggested to no avail. Also while I did find a bit of paper torn off down in my MFC 665 removing it had no effect.