What should be checked first if no zones operate from the controller?

When diagnosing an issue where no zones operate from the controller, checking the power supply to the controller should be the initial step. This is critical because if the controller isn't receiving power, it cannot send signals to activate any zones.

The controller typically requires a stable power source for operation, whether it is through a direct connection to an electrical outlet or through batteries if it is designed that way. Without power, the entire system becomes inoperative, leading to a complete lack of functionality across all zones.

While other factors, such as wiring connections, water source pressure, and zone programming settings, may also contribute to zone operation problems, they should be considered only after ensuring that the controller is receiving adequate power. If the controller is powered but still not operating, then further investigation into those other elements can be conducted.