LaserJet CM1415fnw won't connect to wireless network

[RichStone]

I have been using my printer for several years with Windows xp and now with 10. I recently upgraded my modem/router with timewarner/spectrum. Now the printer finds the new router but always says the wpa passphrase is incorrect. I logged onto the router and set the security to wpa/wpa2-psk. Didn't help. All my other devices connect fine, my laptop, ipad, and cell phone. I did suceed in connecting the printer to the network by setting security to 'open'. When it reset the security to wpa/wpa2, it still does not like the password. Luckily I have a workaround by using the hotspot on my cell phone. Both my laptop and the printer will connect to that wireless hotspot, so I can print documents, but it is not the most convienent. The security on the hotspot is wpa2-psk, which makes me more confused. I've tried every every hint I could find on the forums, not no luck. I even talked to the Spectrum help line. They tried changing various settings and rebooting, but no luck.

[sabretooth04]

Replacing/reconnecting/changing your wireless router, try here.  

http://www8.hp.com/us/en/campaigns/wireless-printing-center/reconfiguring-system-help3.html

* Reset your printer back to Network Defaults.  Then run the Wireless Setup Wizard to connect.  Both can be accessed from the front panel or computer.  If no front panel for configuration, you must use your Printer USB cable to connect.  You can also try the WPS method if your router/printer supports this only if the Wizard or Printer USB cable is not available.  Read your User Guide for info.
* Set router to a fixed wireless channel like 1, 6 or 11, never ‘auto’.  Try channel 1 first then the others one at a time.  
* Make sure printer and router are at least 5 feet apart.  
* The router must have the 2.4G SSID band enabled with a different name than your 5.0G SSID band in your router.  
* Make sure IPv6 is disabled in the printer.

Make and model of modem and router?

However if you have a Gateway (modem+router) device, all Gateway devices are terrible for wireless connectivity.   If this does not work, suggest you think about putting that gateway device in full bridge mode and install your own high quality router that YOU have full control over.