66 ESP-LX Modular Controller
Alarm Light
The alarm light on the face panel of the ESP-LX Modular will
illuminate and an appropriate text message will display when
programming errors and other conditions (for example electrical
faults or an active sensor) prevent watering.
Electrical Faults
If the controller detects an electrical fault on one of the valve
circuits, the controller automatically shuts off the faulty circuit and
advances to the next working valve in the program. The Alarm light
on the face panel of the controller will light, and the display will
describe the fault condition.
After the program finishes, you should isolate and repair the fault in
the circuit. Faults occur most frequently in the valve solenoid or in
the wire connectors on the valve leads.
After you find and repair the fault, operate the valve manually to
make sure it works properly. See page 50 for instructions.
Active Sensor
A sensor connected to the ESP-LX Modular controller may suspend
watering when certain conditions are met, such as rainfall. In this
case, the alarm light will illuminate, and the display will show that
watering has been suspended by the sensor.
If the sensor is working properly, no further action is required.
When the sensor condition no longer exists, normal watering will
resume, and the alarm light will go out.
If you suspect the sensor may be faulty, you can bypass it, as
described on page 45. Troubleshoot and repair the faulty sensor,
and then set the sensor switch back to “ACTIVE.”
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