12 Open or No EP
The top cover is open.
The toner cartridge is not installed.
There is a defective interlock switch assembly.
Part of the top door that pushes the plunger down is broken.
The top door switch (plunger assembly) is broken.
IIIP, IIP Plus, IIP
The paper path door or top cover is open.
– Close the paper path door or top cover.
A toner cartridge is not installed or it is not seated.
– Replace or reseat the toner cartridge.
There is a defective fan, PS4, or PS5.
The external fuser access door is not closed.
Error Codes – 25