If your Amazon Echo dot is not responding then contact the Echo customer support for help or go through this article to know how you can fix this problem.
The reason behind your problem might be due to the other noisy appliances at your home, so keep your Amazon Echo dot away from those noisy things.
If you haven’t connected your Echo dot to power supply then there is no chance that Echo dot will respond to your command. Then ensure that your Echo dot is connected with power supply.