Door Open error message - Dell 1135n AllInOne Laser Printer

Sounds like the door interlock switch electrical connector is failing to make a connection. You can open the panel and inspect the lock to confirm. Clean as needed (Please remove power from the unit at the circuit breaker panel before opening the door panel).
Jim

Hi
Have you checked the cartridges access door?
If so,try disconnecting the printer and leaving it for a long period [like 1hr] before connecting again.

Error: "Rear access door open" (3514)
How do I resolve the error message "Rear access door open" (error code 3514)
To clear the "Rear access door open" error message:

1. Remove the rear access door from the printer.
2. Reinstall the rear access door on the printer and verify that both latches are securely engaged.
3. Unplug the AC adapter from the printer.
4. Plug the AC adapter back into the printer.
5. Wait for the printer to initialize.
6. Verify that the error has cleared.

I think the message is instructions, as in
(1) open door (2) clear carriage jam (3) press enter
So there is something internal to the printer that makes it think it has a carriage jam, piece of paper under a sensor, dirty or stuck sensor.
If you can't find it using a bright light, try canned air.

Try the following:

1. Open the printer access door.
2. Put out both ink cartridges and the printhead.
3. Let the printer access door open.
4. Put out all paper.
5. Pull out the ac adapter at the back of the printer.
6. Wait 60 sec.
7. Pull in AC adapter.
8. Wait 30 sec. then turn on the printer
9: Wait for the error message: Printer access door open.
10. Close the printer access door.
11. Wait for the error message: Printhead is missing.
12. Open the access door and put in only the printhead and the close the access door.
13. Wait for the error message: both ink cartridges are missing.
14. Open access door, put in only the black ink cartridge, then close the acess door.
15. Wait for the error message: Color ink cartridge is missing.
16. Open access door, put in the color ink cartridge and then close the access door.

If the error is solved, do a firmwareupdate right now.

You can find it here.

check all the doors of the printer. If they are not closed, The printer will continue to throw this error.

Same printer works fine on another PC. Unfortunately.

I have an Hp Officejet 5110. I have an error message saying "Open door,clear carriage jam, then press enter". But where is its door? How can I clear the carriage jam?

I tried pressing the # & 6 at the same time, but the error message still there.

have that opened up in a service center and tell them that you dropped it. they will tell you that the sensor is busted. that will have to be replaced. hope this helps.

fixya!