Solutions may help you:
1. Confirm the main water supply and all branch lines are fully open. Turn the dial to AUTO mode, and verify the date & time are set correctly.
2. Double-check all wiring connections, including links between the timer, main valve (or pump starter), and every terminal joint.
3. Inspect wires for damage or corrosion; replace faulty wiring as needed.
4. Perform a full reset: Disconnect power to the timer for 3 minutes, restore power, then press the reset button on the back of the LCD cover. If no hardware damage exists, the timer will accept programming and work normally again.