IES-1248-51/51A/53 User’s Guide
Chapter 58 Troubleshooting 431
CHAPTER 58
Troubleshooting
This chapter covers potential problems and possible remedies. After each problem description,
some steps are provided to help you to diagnose and solve the problem.
58.1 The SYS or PWR LED Does Not Turn On
The SYS/PWR LED does not turn on.
58.2 The ALM LED Is On
The ALM (alarm) LED lights when the IES-1248 is overheated, the fans are not working
properly, the voltage readings are outside the tolerance levels or an alarm has been detected on
the ALARM input pins.
Table 103 SYS LED Troubleshooting
STEP CORRECTIVE ACTION
1 (IES-1248-51, IES-1248-53) Make sure the power wires are properly connected to the
power supply and the power supply is operating normally. Make sure you are using the
correct power source (see Appendix B on page 445).
(IES-1248-51A only) Make sure the power cord is properly connecting the device’s power
socket to an appropriate power outlet. Make sure you are using the correct power source
(see Appendix B on page 445).
2 Make sure the power wires are connected properly.
3 (IES-1248-51A only) Make sure the fuse is not burnt-out. Replace the fuse if it is burnt
out. See Appendix D on page 453 for instructions.
3 The LED itself or the unit may be faulty; contact your vendor.
Table 104 ALM LED Troubleshooting
STEP CORRECTIVE ACTION
1 Use the statistics monitor command to verify the cause of the alarm. See step 2 if the unit
is overheated, step 3 if the problem is with the fans and step 4 if the voltages are out of
the allowed ranges.
2 Ensure that the IES-1248 is installed in a well-ventilated area and that normal operation of
the fans is not inhibited. Keep the bottom, top and all sides clear of obstructions and away
from the exhaust of other equipment.
3 Make sure you can feel and/or hear the fans working - working fans emit a low buzz and
blow air.
4 If the voltage levels are outside the allowed range, take a screen shot of the statistics
monitor command display and contact your vendor.
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