Learn how to check the fundamental electrical functions of your sprinkler controller. How to use a multimeter to check your sprinkler controller. Where to find answers to your sprinkler controller questions. How to know if you have a wiring problem with your sprinkler system. Imperial, Hunter, Orbit & Rainbird controller troubleshooting. What is a sprinkler controller's job? Sprinkler Repair DIY. Sprinkler Repair. Do it yourself sprinkler repair. Sprinkler Troubleshooting