It tells me the carriage door is open causing the printer not to operate. It says close door and press enter. We do that and it makes an attempt to operate then the same message repeat itself

The carriage does not accept one or more of the printheads. Typical causes are dirty contacts on the printheads or carriage, defective printhead(s), or a defective carriage.
If parts are replaced or fixed in any of the steps listed below, attempt to verify printer functionality by turning the printer on and printing internal test prints. If functionality is verified, no additional parts should be replaced.

1. Turn the printer on.
2. Allow printer to complete initialization.
3. With the printhead icon highlighted, press ENTER.
4. Select Replace Printheads and press ENTER.
5. If the message "Printheads still functional" appears, select Yes to continue testing the printheads.
6. Open the top cover.
7. Open the carriage cover and remove all of the printheads.
8. Turn the printer off.
9. Clean the electrical contacts on the carriage and the printheads using a lint-free cloth dampened with water.
10. (for this step I suggest using the erraser on the back of a regular pencil instead of a cloth and water)
11. Allow the contacts to dry.
12. Reinstall the printheads and close the carriage cover.
13. Close the top cover.
14. Turn the printer on and attempt to verify functionality, as instructed in Step 19.
15. If the error reappears, replace the affected printhead(s).

NOTE: If the printhead error icon is a question mark, each printhead will have to be tested separately, as the printer is not sure which printhead is causing the problem.
1. Following replacement of the suspect printhead(s), attempt to verify functionality (Step 19).
2. If the problem persists following, replace the carriage and trailing cable (refer to pages 8-36 to 8-46 of the service manual).
3. Following replacement, turn the printer on.
4. Make sure the printhead alignment completes successfully and that no error messages appear on the front panel.
5. Print a troubleshooting plot (as instructed below) to ensure the print quality is acceptable.
   1. On the front panel, select the printer icon and press ENTER.
   2. Select Utilities and press ENTER.
   3. Press the UP and ENTER buttons simultaneously.
   4. Select Yes to enter the Service Menu.
   5. Select Service Utilities and press ENTER.
   6. Print pages 1, 2, 3, 4 and 5 to prove printer functionality.

1. Turn on the unit, then open the print cartridge access door. The print carriage moves to the center of the unit. Never attempt to move the carriage by hand.
2. Press down lightly on the top of the ink cartridge latch and pull the lower section of the latch out to release the cartridge.
3. Pull the cartridge out of its holder.
4. Carefully remove the protective tape from the new cartridge.
5. Reinsert the new cartridge into the carriage at a slight angle. When the cartridge is fully inserted into the carriage, rock it upright.
6. Hold the hinged flap of the latch out while lowering the latch.
7. When the latch is fully lowered release the hinged flap. It should catch under the tabs on carriage.
8. Close the cartridge access door.
9. The LCD display may indicate the cartridges need to be aligned. Load paper and press "Enter" on the front panel.Discard the alignment pages that print.

Check the following steps for fixing Hp Carriage Jam Error :

Open the print carriage access door. Check for any packing material that may be blocking the internal components. Check for an orange shipping lock that may still be in place on the left side. Pull the shipping lock out, if present, and discard.

Remove and reinstall the cartridges to make sure they are properly installed. Lift the front center of the print carriage access door to open it. Lift the door up until it locks into an open position. Press down on a print cartridge and allow it to spring back up. Lift the cartridge out of the printer. Do the same for the other cartridge. Slide the black cartridge into the slot on the left and the color cartridge into the slot on the right. Press down on each one to lock it into place. Lower the print carriage access door.

Check the print cartridges to make sure the protective tape has been removed from the ink nozzles. Remove the cartridges from the printer. Remove any tape or labels. Replace the cartridges into the printer.

Push in on the tab on the left side of the clean-out door on the back of the printer to open the door. Lift the door out of the printer. Check for any paper jams. Jammed paper can block the printer cartridge carriage from moving. Pull any jammed paper out.

1. Turn the printer on.
2. Allow printer to complete initialization.
3. Scroll to the Printhead menu icon (icon on the lower right of the front panel display) and press Enter.
4. Scroll to Replace Printheads and press Enter.
5. If the message "Printheads still functional" appears, select Yes to continue testing the printheads.
6. When instructed, open the top cover.
7. Open the carriage cover and remove all of the printheads.
8. Turn the printer off.
9. Clean the electrical contacts in all carriage slots and on all printheads (instructions below).
10. Allow the contacts to dry.
11. install the new printheads and close the carriage cover.
12. Close the top cover.
13. Turn the printer on and attempt to verify functionality.

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.

A cartridge jam, could be that one of your ink cartridge is not in all the way and causing the carriage to get stuck trying to find "HP". You may try to remove the ink cartridges and close the door / cover and let the printer find home and reinstall the cartridges agian... Good Luck

yes, that is a carriage jam and not paper, the grinding is from the clean station that gets blocked with dried ink and cant move. you need to open the printer and clean the ink off of the clean station so it can clean properly and not cause a carriage jam.

Hope this helps you. This error is caused by either a correct or incorrect detection of air in the manifold. The steps below will clear the error condition, which should solve the problem if it is caused by an incorrect detection of air. If there really is air in the manifold, however, this procedure will not solve the problem and the printer will have to be serviced. Step 1 - Remove all printheads CAUTION: Do not touch the printhead tower. Do not remove the printhead handle. Keep printheads out of the reach of children. Figure 1: HP 14 printhead 1 - Handle 2 - Tower

1. Make sure the unit is plugged in and the power is turned on.
2. Open the print carriage access door by lifting the handle until the door locks in place. The print carriage moves to the center.
3. Wait two or three seconds, then unplug the power cord.
4. Open the printhead latch. See the illustration below. Figure 2: Open the printhead latch
5. Remove each problem printhead by lifting the printhead handle and pulling up. See the illustration below. Figure 3: Remove the printhead

Step 2 - Reset the internal error state NOTE: This step must be performed before the printheads are re-installed.

1. Close the printhead chute.
2. Close the access door.
3. Plug the power cord back in.
4. Turn on the power. The front panel should read No Printhead. Will damage Product. Insert [color name] [icon] printhead now . NOTE: The carriage may make a grinding noise when you turn the power on. This noise is normal.
5. Open the print carriage access door by lifting the handle until the door locks in place. The print carriage moves to the center.
6. Wait two or three seconds, then unplug the power cord.
7. Open the printhead latch.

Before re-inserting the printheads, make sure all the electrical contacts have had at least five minutes to dry. Step 3 - Insert the printheads

1. Place each printhead in its slot in the printhead carriage. The colored shape on the top of the printhead should match the colored shape on the proper slot on the printhead carriage.
2. Press down firmly and evenly on both the front and back of the printhead, as shown in the illustration below. Proper seating is essential to making good electrical contact.

Figure 4: Seat the printhead Step 4 - Close and check the printer

1. Close the printhead carriage latch and make sure the loops catch the hooks. See the illustration below. Figure 5: Loops catch hooks
2. Snap the latch into place.
3. Plug in the power cord.
4. Close the print carriage access door.
5. Turn on the power.
6. If the error clears, a message to align the printheads may appear on the HP Officejet D and HP Officejet 7100. Press Enter to align. If the error persists contact HP. Printhead replacement will not resolve this problem - the printer will have to be serviced.

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Try this:

Open door, disconnect power.
Move carriage to center by hand and ensure it IS latched.
Close door.
Reconnect power.