How to open a warranty case

[paddelia1]

Hello, My printer is under warranty, it has 2 problems, Printer head issue and network issue.
Printouts are blurred and fainted, they may work after clean-up for 2-3 pages but then get illegible immediately after. I have almost new OEM cartridges.
Printer gets offline. I can connect it again for a few hours, then it goes offline again, no way to keep it online
I have spent a while with HP tech support, going through 2 technicians but the problems are not fixed.
I also spent a great deal of time myself trying to get the printer online again and printing something readable, but it fail again after a couple hours.
I want to claim my right to a warranty repair or exchange of this printer but I have a really hard time to find how to open a warranty claim with HP and what to do with the printer. I cannot return it to the store, their return window has expired and I do not think I can drop it to a service center without prior instructions and case number from HP. 
I find it super difficult to claim warranty RMA or case number from HP. They make it really obscure and I need help to identify how to register my case with HP. It looks like it is possible only during business hours but I am working so it is not easy for me.
Thank you

[BeemerBiker · Accepted solution]

Click here to check warranty
You can also contact the closest authorized service center
If you have (or get) a service order number you can check for status here.
Click here to read how to dispute a warranty.

How to contact an HP agent:

Sign in to your support page
Select the product you need help with and scroll down to support options.
Select "Contact us". You can change country and language if necessary.
If your HP product is out of warranty you can extend your PC coverage with HP Care Packs as described here.

If your printer model ends in the letter 'e' then click the spoiler for special needs.

Spoiler

HP+ printers are designated by a lowercase "e" at the end of their model number (e.g., 8135e rather than 8135). These models are enabled for HP's smart printing ecosystem, which requires a permanent internet connection, an HP account, and the exclusive use of Original HP ink for the lifetime of the printer.

Wi-Fi printers are not plug and play.  I can help you with the network setup and it is possibly to print directly to the printer thus bypassing the router.  Printer networking can be a real problem if you  have Wi-Fi booster or repeaters or any 2.4ghz appliances such as camera or sensors. 

[paddelia1]

Thank you for the answer, this is helpful. The network issue could be addressed by wiring a rj 45 cable so I eliminate the wifi issue altogether.
My setup is complex, recent ATT fiber router multi band, cameras, repeaters, multiple devices, some of them working only on the guest network.
For the other issue, the printhead, for which the printer displayed an error message a few days ago, it is hardware defect. I will contact HP on Monday to try to get a case number.

[BeemerBiker]

I had the same problem when I added amazon/google power switches and wi-fi cameras.  The first time the power went out the router assigned different IP addresses for the cameras.  The printer IP address was given to one of the cameras.  While the printer was actually online, the PC did not have the correct IP address.

This can also happen with hardwired ethernet. 

You can either print directly to the printer using Wi-Fi direct or you can have the router assign static (reserved) IP addresses to the printer and the cameras.

If the router assigns a random IP address the printer can always contact the server.  Unfortunately, if a PC has the old IP address that will not work anymore.  It is like someone changing their phone number and not telling you.

Ideally, your Wi-Fi printer should connect to the modem or router. If your network has multiple boosters / repeaters, it is possible the printer may connect randomly to any of the units. The router needs to provide the same IP address on every connection. This rarely happens with random connects. An alternate Wi-Fi connection is Wi-Fi direct. Your laptop or smartphone prints directly to the printer and does not go through the router. For web services the printer must be online through the router, but you can still print using Wi-Fi direct. Do not call any phone number revealed in any video or site.

This video shows how to connect to the router: 8130 8132 8134 8135 8139 9125
Wi-Fi Direct can be used to avoid configuring the router. Watch this: 8135e
Wi-Fi Direct is explained on page 29 of the User Manual, this Wi-Fi setup avoids configuring the router.

[paddelia1]

All good points, One IP address issue I had was the printer falling back to an unassigned ip address. I set up the printer and the router to reserve a fixed IP for the printer, but even this did not work more than 12 hours, the printer is still on the fixed IP even after reboot and the router has still the assigned correct IP the printer would go offline anyways. Yesterday I was able to access the integrated printer web page today it is not working. I went through tons of diagnosis. At this point and with all the hours of trying to get this thing to work, I give up and return it under warranty. This printer was working without a problem for 9 months and now it is a dead brick. I can tell that the problem started right after a thunderstorm when a small power glitch happened. This reminds me when I was designing electronic boards and adding a protection diode by the switching power supply. My boss was not happy because this was 12 cents more money on the board and when I said this is to protect the device against power surges, he told me he did not care as long as the device was failing after the warranty expired... This is pure conjecture while this may be why the device failed. For the most important devices like laptops and computers, I have a Power stabilisation unit, so they are shielded against these surges. But this printer is on a wall plug too far from my power stabilizer.