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Installation and Operation Manual
Troubleshooting If a module shows two green indicator lights and the display panel shows a red
phase indicator light, follow the Troubleshooting Flow Chart in Figure 9 below.
Replacement Parts The following replacement parts are available. For ordering information refer to
the product catalog.
• SPD modules. Replacement instructions are included with the
replacement parts.
• Diagnostic display panel assemblies. Replacement instructions are
included with the replacement parts.
Figure 9: Troubleshooting Flowchart
START
Red phase
LED(s) lit.
Alarm on?
Is alarm
Enable/Disable
LED on?
Press alarm
Enable/Disable
switch. Is
alarm on?
Is alarm LED
on?
NO
NO
YES
YES
Check
patch cable
connections. Is
Red LED(s)
on?
Check the
voltage on
each phase. Is
the voltage
correct?
LEDs lit on
all modules?
Possible diagnostic
display panel failure.
Contact APC
Technical Support at
1-800-800-4272 for
troubleshooting.
NO
YES
YES YES
NO
YES
YES
NO
Check the power
utility feed and
verify voltage levels.
NO
Replace module(s)
that do not have
LEDs lit.
Energize SPD and
verify proper
connection.
NO
Troubleshooting