Dell Laser MFP 1815 won't print. Message keeps coming up Jam 2 open rear and front door. Have opened and shut doors repeatedly, restarted printer, tried copying over message but it keeps being displayed. What can be done?

I had same problem. If you go to rear of printer and open the back door you'll see it is attached to a blue connector. Unattached it so that the door opens fully and then unflap the inside roller assembly. Next open the fuser door and you'll notice a little spring loaded assembly on the inside of the opened fuser door. This is where my problem was. Make sure that the assembly springs back when pushed because part communicates with a sensor on the motherboard. If it doesn't spring back then the printer thinks there is a jam. Mine was stuck but after pushing it a few times it started to work freely again. This was a frustrating problem but that fixed my issue and hopefully it will fix yours.