Paper jam does not give me a code just says paper jammed where is rear door. sorry d

these machines only have one sensor that gives the paper jam message, and its not uncommon for a foreign object to find it way inside and hold the little black lever open and give you a false paper jam message.
so first remove all paper from both the cassette and rear feed, then use a torch/flashlight to look inside, you might need to open the rear door and look in there as well.

Hi,

1. Turn off the HP product and turn it around so the back of the unit faces you.
2. Disconnect the power cord from the back of the all-in-one. The power cord must be disconnected to allow the paper feed rollers to turn freely.
3. Locate and open the rear access door by pressing in on the left side tab and then pulling the door toward you. Figure 2: Removing the rear access door

Inspect the pressure rollers on the rear access door and verify that they are clean and turn freely. Clean the rollers if needed with a soft towel lightly moistened with water. If the rollers do not turn freely, replace the rear access door. Click How to Buy on this page to order replacement parts.

1. From the rear access door opening, remove the jammed paper.
2. Remove the remaining paper from the paper supply tray. Discard any paper that is damaged or crumpled and then re-stack and reload the paper into the paper supply tray.
3. Reinstall the rear access door.
4. Reconnect the power cord to the unit and turn the unit on.

The following information will help prevent paper jams from occurring:

• Never use paper that is torn or wrinkled.
• If you are having problems using paper that has already been printed on once (recycling), replace it with new paper.
• Remove and then reinstall the rear access door. Verify that the access door is fully locked in place. The paper can skew if the rear access door is not locked.
• Every six months to one year, clean the paper feed rollers with a rag lightly moistened with water. Over time the paper feed rollers accumulate dust and do not function as well as they once did.
• When printing envelopes, tuck the flap into the envelope and crease the folds before printing.

Goodluck..

After a paper jam occurs in the rear cover of a Dell Laser Multi-Function Printer 1815N, the printer will not resume when the jammed paper is removed. This is the normal behavior of the printer as there is no sensor on the rear cover of this printer.

To open the back cover and remove any stuck paper, perform the following steps:

1. Open and close the front cover.
   The jammed paper may automatically exit the printer. If the paper does not exit, go to the next step.
2. Gently pull the paper out of the output tray.
3. If you cannot see the paper in the output tray or the paper does not move when pulled, open the rear cover.
4. Skip to step 9. If you do not see the paper, go to the next step.If you see the jammed paper, push the two blue pressure levers up and remove the paper.
   
5. Release the blue strap, the rear cover stopper, and fully open the rear cover.
6. Unfold the duplex guide fully.
7. While pushing the fuser lever to the right, open the fuser door. NOTICE: Make sure to unfold the duplex guide before opening the fuser door, or the fuser door may be damaged.
   
8. Pull the jammed paper out.
9. Return the levers, fuser door, rear cover stopper, and duplex guide to their original position.
10. Close the rear cover.
11. Open and close the front cover.
    Printing automatically resumes.

Follow these steps to clear the jam from the product. Step one: Remove any loose paper Remove any loose sheets of paper from the input tray and the output tray.
CAUTION: Do not remove jammed paper at this stage. Trying to clear jammed paper from the front of the product can damage the print mechanism. Remove any loose paper Do not pull jammed paper Step two: Clear the jam from the rear of the All-in-One Follow these steps to clear the paper jam from the rear of the product.
CAUTION: Never pull jammed paper from the front of the product. Pulling paper from inside the front cover can cause mechanical damage to the product. Always access and clear paper jams through the rear access door.

1. With the product powered on, disconnect the power cord, USB cable, and Ethernet cable from the rear of the product.
2. Press in the tab on the rear access door to release the door. Pull the door away from the product to remove it. Figure 1: Remove the rear access door
3. To avoid tearing jammed paper, gently grab both edges of the jammed paper, and then pull with even pressure to remove.
4. Use a flashlight to thoroughly check the rollers and wheels for torn pieces of paper that might remain inside the product.
   CAUTION: Make sure to remove any bits of torn paper from the rollers inside the product. If any torn pieces of paper remain inside the product, more jams are likely to occur. Figure 2: Check the product for bits of torn paper
5. While you have the rear access door removed, check the rollers with your fingers. Rollers should roll freely and feel springy. If rollers are missing or do not turn freely, buy a replacement rear access door. Click here to order a replacement part from HP .
6. Reattach the rear access door. Gently push the door toward the product until it snaps into place.

Step three: Clear the jam from the front of the All-in-One
CAUTION: Carefully remove bits of torn or jammed paper from the front of the product. If you pull too hard on jammed paper, you might damage the print mechanism.

1. Make sure that you disconnect the power cord from the rear of the product.
2. Open the cartridge access door. Figure 3: Open the cartridge door
3. Gently pull out any jammed bits or torn pieces of paper from the rollers inside the product.
   CAUTION: If the paper tears when you remove it from the rollers, check the rollers for torn pieces of paper that might remain inside the product. If pieces of paper remain in the product, more paper jams might occur.
4. Close the cartridge access door.
5. Reconnect the power cord to the rear of the product.
6. Press the Power button ( ) to turn on the product.

make sure you don't have any small pieces of paper stuck in the printer
Paper jams can be real or false. The unit may report a paper jam when there is not any jammed paper, however, the solution to a real paper jam or a false paper jam is the same. WARNING: Jammed paper must be removed using the rear access door and the power cord must be disconnected or a carriage jam or mechanical damage may occur. Do not remove jammed paper from the front of the unit.

1. Turn off the HP product and turn it so the back of the unit faces you.
2. Disconnect the power cord from the back of the all-in-one. The power cord must be disconnected to allow the paper feed rollers to turn freely.
3. Locate and open the rear access door by pressing in on the left side tab and then pulling the door toward you. Figure 1: Removing the rear access door Inspect the pressure rollers on the rear access door and verify that they are clean and turn freely. Clean the rollers if needed with a soft towel lightly moistened with water. If the rollers do not turn freely, replace the rear access door.
4. Inspect the pressure rollers on the rear access door and verify that they are clean and turn freely. Clean the rollers if needed with a soft towel lightly moistened with water. If the rollers do not turn freely, replace the rear access door. Click How to buy on this page to order replacement parts.
5. From the rear access door opening, remove the jammed paper.
6. Remove the remaining paper from the paper supply tray. Discard any paper that is damaged or crumpled and then re-stack and reload the paper into the paper supply tray.
7. Reinstall the rear access door.
8. Reconnect the power cord to the unit and turn the unit on. If a carriage stall occurs after clearing the paper jam, resolve the carriage stall.

You did not post a Make/Model but with many machines they will have a trap door/panel at the rear of the printer. If paper did not pickup from paper tray properly then it will show a jam message that can only be reset by opening the rear door/panel.

The 202.03 error code has to do with an early life failure of the fuser. Try replacing the fuser. If that doesn't work, a tech is needed to replace rear door. Don't forget to reset maintenance counts when you replace fuser!!

This video explains how to resolve a recurring paper jam on your product. It sounds like the rollers on the rear access door may not be working properly and are making jamming the paper as it starts to feed up into the printer? Check the rollers on your rear access door and see if they have some give in them and roll freely.

You need to change the paper type when using card stock, plain etc.
As for the paper jams; you need to check the exit sensor at the exit door, also if you have a duplex, 2-3 drawer you also need to check for jams.

Follow these steps to clear paper jam

Clearing paper jams
Paper jams can be real or false. The unit may report a paper jam even when there is no jammed paper. The solution to a real paper jam or a false paper jam is the same.
CAUTION:
Jammed paper must be removed using the rear access door with the power cord disconnected to avoid mechanical damage. Do not remove jammed paper from the front of the unit.

1. Turn off the HP product and turn it around so the back of the unit faces you.
2. Disconnect the power cord from the back of the all-in-one. The power cord must be disconnected to allow the paper feed rollers to turn freely.
3. Locate and open the rear access door by pressing in on the left side tab and then pulling the door toward you.

Figure 2: Removing the rear access door

1. Inspect the pressure rollers on the rear access door and verify that they are clean and turn freely. Clean the rollers if needed with a soft towel lightly moistened with water. If the rollers do not turn freely, replace the rear access door. Click How to Buy on this page to order replacement parts.
2. From the rear access door opening, remove the jammed paper.
3. Remove the remaining paper from the paper supply tray. Discard any paper that is damaged or crumpled and then re-stack and reload the paper into the paper supply tray.
4. Reinstall the rear access door.
5. Reconnect the power cord to the unit and turn the unit on.

Preventing paper jams
The following information will help prevent paper jams from occurring:

• Never use paper that is torn or wrinkled.
• If you are having problems using paper that has already been printed on once (recycling), replace it with new paper.
• Remove and then reinstall the rear access door. Verify that the access door is fully locked in place. The paper can skew if the rear access door is not locked.
• Every six months to one year, clean the paper feed rollers with a rag lightly moistened with water. Over time the paper feed rollers accumulate dust and do not function as well as they once did.
• When printing envelopes, tuck the flap into the envelope and crease the folds before printing.