Sprinkler Controller Blank Screen After Electrical Work: Power Surge Recovery

Controller Display Dead After Breaker Work; 9V Battery Replaced

A momentary power surge when flipping breakers can scramble the controller’s microprocessor.

Remove the backup battery.
Disconnect AC power for 1 minute.
Reapply AC power without the battery.
If the display returns, reprogram the controller. If it stays blank, the controller is permanently damaged—replace it.

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