When every zone fails at the same time, separate a controller problem from a shared water-path problem. Confirm the controller is powered, test two zones manually, verify the known irrigation supply is open, and check any rain sensor, common wire, master valve, or pump relay that all zones share.
Match the pattern before opening anything
| Possible cause | Best clue | First check |
|---|---|---|
| Irrigation water shut off | Valves are silent or click but no zone flows | Verify the dedicated irrigation shutoff is open |
| Controller or transformer power loss | Display is blank or resets | Check the outlet, breaker, and plug-in transformer |
| Common-wire failure | Controller runs but several valves stay silent | Inspect the common terminal and shared field splices |
| Master valve or pump fault | Individual zone commands appear normal | Look for a wire on the P/MV terminal |
Check these in order
- 01
Test two unrelated zones
Start two stations manually from the controller. If neither produces water, do not replace two solenoids; the probability is much higher that a shared component has failed.
- 02
Check power and controller status
Confirm the display is stable and look for rain delay, sensor-off, seasonal-off, fuse, or fault messages. Use the exact model manual because bypass controls differ.
- 03
Verify the known water path
Check only shutoffs you can positively identify as irrigation controls. Do not force an old valve handle or dismantle a backflow preventer under pressure.
- 04
Identify shared electrical hardware
A common wire joins multiple valve solenoids. A master valve or pump relay may be controlled from the P/MV terminal. Loose shared connections can stop every station while the display still looks normal.
- 05
Escalate the right fault
If manual valve operation produces water, the supply path is available and the problem is electrical. If no valve operates manually, focus on the shared water supply, master valve, or pump.
- The controller or transformer shows heat, arcing, or water damage.
- A pump, pressure tank, master valve, or backflow device is involved.
- You cannot identify the irrigation shutoff safely.
What homeowners ask about this symptom
Can one bad solenoid stop every zone?
Usually no. One solenoid normally affects one valve. Every zone failing together points first to a shared supply, common wire, controller power, master valve, or pump relay.
Why does the controller look normal when no zones run?
The display confirms the controller has logic power, not that water is available or that the 24-volt valve circuit, common wire, master valve, or pump is operating.
Sources and review notes
General maintenance logic is checked against EPA WaterSense outdoor irrigation guidance. Product controls and disassembly steps vary by model; use the current manufacturer manual for your exact valve, controller, or sprinkler head.
Published and last reviewed: August 28, 2026