If you have problems pairing your controllers this tutorial will quide you how to this properly. Follow this steps they will help you into finding the problem with your controller.
Step 1. The very first basic step for you to do is to make sure that your controller is charged and turned on.
Step 2. If your controllers are charged and turned on check their connectivity.
■ If the light is solid blue than your controllers are not connected successfully.
■ To re- pair them go to SteamVR > Devices > Pair Controllers.
■ If after re-pairing your controller the light is red than you will need to reset the controller because it will not respond.
Step 3. Reset controller
■ Hold every button on the controller except the system button.
■ While doing the previous step plug in the controller into your PC with a micro USB cord.
■ After five second you can release the buttons and unplug the micro USB cord to reset
■ After taking this steps your controller should work normally.