Xiao Pei's pet max's litter box can't be opened.

For the problem that Xiao Pei's pet max's litter box can't be opened, the following possible solutions can be given:

1. Check whether the power plug and power cord are securely connected. Make sure the plug is plugged into the socket and the power cord is not damaged.

2. Check whether the power switch is turned on. Some garbage bins may have a power switch to make sure it is on.

3. Check whether the power adapter works normally. You can try to test the adapter with other devices, or replace the original adapter with a new one.

4. Check whether the battery of the dustbin is exhausted. If the litter box is powered by a battery, the battery may need to be replaced.

5. If the above methods fail to solve the problem, it is recommended to contact the after-sales service or manufacturer of the cat litter box for professional technical support and solutions.