Error Code 0F , Duplex Disabled, Close the Back Cover, Brother MFC
Not really much to say on the Error code  0F problem. Just make sure that  everything in the back of the machine is  installed and plugged in together.  I put a picture of the duplex sensor  below  to make it easier to troubleshoot. Hopefully  you just got a  paper jam and  when you put everything back together just the duplex unit  didn’t get put back in  all the way.
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DCP- 7055, 7057, 7057E, 7060D,7065DN, 7070DW
HL-2280DW
MFC-7360, 7360N, 7362N, 7460DN, 7470D, 7860DN, 7860DW
Error code 0F
Display Reads=
Duplex Disabled
Close the Back Cover of the machine and put the Duplex Tray back in.
The back cover is open upon duplex printing.
• Check if the back cover is closed completely.
• Install the duplex tray properly.
1 Harness connection failure of paper eject sensor PCB ASSY Check the harness connection of the paper eject sensor PCB ASSY 
and reconnect it.
2 The member part to press the back cover sensor which is located at the inner side of the back cover is broken.
Replace the back cover.
3 The member part to press the back cover sensor which is located at the duplex tray is broken. Replace the duplex tray.
4 Back cover sensor failure Replace the paper eject sensor PCB ASSY.
5 Main PCB failure Replace the main PCB ASSY.
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