Here you go:
Try adjusting the "Channel" your wireless router broadcasts on. We highly recommend setting your wireless router to either channel 1 or 11. This can potentially increase the download speed. For information on accessing your router's settings, click here to select the brand name and model number of your router (if available).
Check your router's broadcast settings to find out if it is set to "G", "B", or "Mixed." Mixed typically works best, but try all three to see if it improves the network connection to the Wii console.
Make sure that any other interfering devices, such as microwaves and cordless phones, are turned off. Wireless keyboards and mice may also cause interference.
If you are still receiving this error code, please click here for assistance.
(From Nintendo.com)
