Troubleshooting - Alarms - LG AR-DR12-05A Installation And Operation Manual

Several of the electronic controls in the unit monitor the system for faults and will go into alarm, shutting down the unit or a single function
within the unit.
Microprocessor Controller
The microprocessor is located in the main control center. If the microprocessor is in alarm condition, the Alarm button will blink red. Press the
Alarm button to see the specific condition or to reset the microprocessor. Refer to the microprocessor IOM for detailed information on fault
codes and see the unit- specific wiring diagram.
Phase Monitor
The phase monitor has two LED indicator lights, one red and one green. Green indicates proper operational status, red indicates the unit
has detected a fault and is in alarm condition. The alarm LED will blink to show the specific fault and there is a chart printed on the monitor
that shows the code for the blinking light. The phase monitor is self-resetting once the alarm condition is corrected. It is located in the main
control center.
Variable Frequency Drive (VFD)
Variable frequency drives have a display screen that will show an alarm condition. If a fault such as a voltage spike occurs, the VFD will go
into alarm and will not reset until a hard restart is performed. See the unit- specific manufacturer's manual supplied with the unit. VFDs are
located in the main control center.
Optional Digital Scroll Compressor Controller
Present only if packaged DX with digital scroll option is selected. The controller has three
LED indicator lights. One is green, indicating that it has power, one is an alarm indicator that
will flash a code for various alarm conditions and the third indicates whether the compressor
is operating in a loaded or unloaded condition. See the manufacturer's unit-specific manu-
for further information.
See the Fault Code chart. The Fault Code chart is also printed on the back of the controller.
Note that if the controller generates either a Code 2 or a Code 4 Lockout, a manual reset
must be performed. Manual Reset is accomplished by shutting off main power to the unit and
then turning it back on

TROUBLESHOOTING - ALARMS

Fault Code System Condition
Code 2* High Discharge
Temperature Trip
Code 3 Compressor Protector
Code 4* Locked Rotor
Code 5 Demand Signal Loss
Code 6 Discharge Thermistor
Code 7 Future
Code 8 Welded Contactor
Code 9 Low Voltage
*Protective faults that require manual reset
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Diagnostic Alert Light
Blinks 2 Times
Blinks 3 Times
Trip
Blinks 4 Times
Blinks 5 Times
Blinks 6 Times
Fault
N/A
Blinks 8 Times
Blinks 9 Times
Figure 28: Digital Scroll Compressor Controller
Action
Lockout
Lockout
Lockout
Lockout
Reduce Capacity
N/A
Unload Compressor
Trip Compressor
al
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