Printhead error light

[Vulcan1]

My Deskjet Printer GT 5821 suddenly developed an error where the printhead error light, resume light, wireless light and wifi direct light are on. When I switch plug in the power cord and switch on the printer these 4 lights automatically light up and remain constant. They neither blink nor anything happens if I press them. 

The power button has stopped glowing and regardless of how long I press it neither switches off the printer nor responds. 

I have to switch off the power supply or remove the power cord to switch off the printer. 

The printer doesn't work at all now. I have checked for jammed papers but there are none. 

How do I resolve the issue? Is it the printhead problem? But the print quality was fine before so I'm not sure if it's the printhead problem. 

Please help. 

[sandytechy20]

@Vulcan1

Welcome to the HP support community.

Make sure the carriage moves freely

1. Turn on the printer, if it is not already on.

2. Open the exterior door, and then open the printhead access door.

   

3. Wait until the carriage is idle and silent before you continue.

4. With the printer turned on, disconnect the power cord from the rear of the printer.

      WARNING: 

   You must unplug the power cord to move the carriage by hand and reset the paper feed mechanism without the risk of electrical shock.

5. Use a flashlight to check for any paper or objects that might be restricting the carriage, and then remove any paper or objects that you find.

      CAUTION: 

   If the paper tears when you remove it from the rollers, check the rollers and wheels for torn pieces of paper that might remain inside the printer. If pieces of paper remain in the printer, more paper jams can occur.

6. Reach inside the printer through the printhead access door, and then manually move the carriage.

   • If the carriage is stuck on the right side of the printer, move the carriage to the left side of the printer.

   • If the carriage is stuck on the left side of the printer, move the carriage to the right side of the printer.

   • If the carriage is stuck in the middle of the printer, move the carriage to the right side of the printer.

      CAUTION: 

   Do not touch the printhead latch when moving the carriage. Accidentally opening the latch can result in damage to the ink system.

    

   

7. Remove any loose paper or obstructions you find.

8. Make sure the carriage can move freely across the width of the printer. Firmly push the carriage to the left side of the printer, and then to the right side.

9. Close the printhead access door, and then close the exterior door.

10. Reconnect the power cord to the rear of the printer, and then turn on the printer.

You can refer this HP document for more assistance:- Click here

I hope that helps.

To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.

Cheers.