ESP-LXD 2-Wire Decoder Control System Installation & Troubleshooting Guide
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ESP-LXD 2-Wire Decoder Control System Troubleshooting
Consult the ESP-LXD Controller Installation, Programming & Operation Guide (shipped with the
controller or available on-line) for detailed information on the built-in diagnostic features of the
controller.
Section A / Auto – The controller displays the current status of the system along with any alarm
conditions in the Auto dial position.
Section C / Systems Diagnostics – System diagnostic and troubleshooting tools are available in
the Test All Station / Check System dial position.
Troubleshooting
Category
Issue
Potential Cause
Solution
Controller
Alarms
Red alarm light on the
controller front panel is
illuminated.
The controller is reporting an
alarm condition.
Turn dial to Auto, press the Alarm button, review the
alarm conditions, and address the issue(s).
Controller alarm; No
2-Wire Module.
The ESPLX2-M50 Module is
not properly attached to the
controller module slots.
Check the upper status light on the ESPLX2-M50
module. It should be solid green if it is properly
connected to the controller. Remove and reinstall the
module making sure it is fully seated in the module
slots.
Controller alarm; 2-Wire
Path Off.
Someone has manually
turned the 2-wire path Off.
Turn dial to Off, press the 2-Wire Path button, and turn
the 2-wire path On.
Controller alarm;
Duplicate Decoder
Address.
Duplicate decoder addresses
have been entered.
Note the duplicate decoder addresses posted in the
alarm screen, verify and enter the correct decoder
addresses.
Controller alarm; Short
Finding Mode.
2-wire path is shorted and the
controller has automatically
switched to the Short Finding
Mode. The lower left status
light on the controller is dark.
Disconnect the 2-wire cables from the ESPLX2-M50
Module one at a time until the alarm condition clears.
The lower left status light on the controller will alternate
between red and green when the wire path with the
short is removed.
- Trace the path of this 2-wire cable and look for source
of issue (disturbed soil, new tree or fence post, etc).
- Disconnect the 2-wire cable halfway between the
controller and end of cable and check to see if the alarm
clears to help identify short location on the cable.
- Use a volt/ohm and clamp meter to identify which
devices are receiving power.
- Fix the short and check that the alarm is cleared.
Controller alarm; No
Decoder Addresses.
Decoder addresses have not
been entered for any stations.
Turn dial to Setup Wizards and select Station Setup.
Enter the address (see label on each decoder) for each
station. Addresses are also required for Master Valves,
Weather and Flow Sensors.
