Testing a Rain Bird ESP-6TM Controller After Lightning Damage

ESP-6TM Screen Flashes, No Water After Lightning Strike

A lightning strike can damage the controller’s output circuitry while leaving the display functional. To verify if the controller is at fault, measure its output voltage.

Voltage Test

1. Turn on a zone (e.g., zone 1) from the controller.
2. With a volt/ohm meter, place the negative lead on the common (C) terminal and the positive lead on the zone 1 terminal.
3. A reading of 22–26 VAC means the controller is sending power; the problem is in the field wiring or solenoids.
4. If voltage is low or absent, the controller’s output stage is damaged and the unit should be replaced.

Also inspect the fuse (if present) and look for visibly burnt components, though absence of visible damage doesn’t guarantee the controller is good.