Canon G3000 Series Online Manual page 706

Have you entered proper password specified for access point mode?
Check5
If the security setting of the access point mode is enabled, you need to enter the password to connect your
smartphone/tablet to the machine.
Make sure machine is not too far away.
Check6
Locate your smartphone/tablet close enough to communicate with the machine.
Check for obstructions.
Check7
Wireless communication between different rooms or floors is generally poor. Move the machine as necessary.
Make sure there is no source of radio wave interference nearby.
Check8
If a device like a microwave oven that emits radio waves of the same frequency bandwidth as a wireless router
is nearby, it may cause interference. Place the machine as far away from the interference source as possible.
Make sure 5 devices are already connected.
Check9
Access point mode does not allow more than 5 devices to be connected.
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