Not all Wii U console blinking red lights are the same. For me, luckily the issue started when I had another 6 mos. of warranty coverage, so I let the problem linger until I had to send it in. The blinking red light would come and go, but worsened over time. Turned out my console had a bad CPU according to their tech guy.
If you google "wii u blinking red light" you'll see different issues, some have non working fans, bad hdmi, or cpu etc.








