Wall Mounted: 9CQ, 9RQ, 9R2, 9RLQ, *9RL, *9RLS, 12CQ, 12RQ, 12R2, 12RLQ, *12RL, *12RLS, 15RLQ, 18CL, 18RL, 18RLQ, 18RLXQ, *18RLXS, 24CL, 24CL1, 24RLQ, *24RLXS,
*30RLX, 30CLX, 30CLX1, 30RLXQ, 36CLX, 36CLX1
*Operation & Timer LEDs colors are reversed.
Error Indication
Error
Diagnosis Method
Operation
Timer
Wired Remote
Off
2 Times
1
Serial reverse transfer
error at startup operation
Communication error – At startup, evaporator and condenser are not communicating.
-Check wiring from panel to condenser, condenser to evaporator. Wire nuts and splices are not recommended. Check for correct
voltage at panel, condenser and evaporator. Refer to the Service Instructions manual- Serial Signal Troubleshooting for further details.
3 Times
1
Serial reverse transfer
error during operation
Communication error – During operation, evaporator and condenser did not communicate for 10 consecutive seconds.
-Check wiring from panel to condenser, condenser to evaporator. Check for correct voltage at panel, condenser and evaporator. Refer
to the Service Instructions manual – Serial Signal Troubleshooting for further details.
4 Times
13
Serial forward transfer
error at startup operation
Communication error – At the startup, evaporator and condenser are not communicating.
-Reset power. If error code reappears check wiring from panel to condenser, condenser to evaporator. Check for correct voltage at
panel, condenser and evaporator. Refer to the Service Instructions manual – Serial Signal Troubleshooting for further details.
5 Times
13
Serial forward transfer
error during operation
Communication error – During operation, evaporator and condenser did not communicate for 10 consecutive seconds.
-Reset power. If error reappears check wiring from panel to condenser, condenser to evaporator. Check for correct voltage at panel,
condenser and evaporator. Refer to the Service Instructions manual – Serial Signal Troubleshooting for further details.
8 Times
0
Wire remote controller
error
Communication error- evaporator and wire remote controller are not communicating.
-Check wiring between evaporator and wire remote controller.
-Check for DC 12V at evaporator connector. If voltage present replace wire remote control.
2 Times
2 Times
2
Room temperature
thermistor error
Abnormal temperature detected
-Check thermistor for open or short.
-Controller PCB defective.
3 Times
4
Indoor heat exchanger
thermistor error
3 Times
2 Times
0C
Discharge thermistor error
3 Times
6
Outdoor heat exchanger
thermistor error
4 Times
0A
Outdoor temperature
thermistor error
8 Times
15
Compressor temperature
thermistor error
4 Times
2 Times
No display
Forced auto switch error Forced auto switch open (pushed in) for 30 consecutive seconds or more.
-Check if forced auto switch is stuck in pushed-in position. -Controller PCB defective.
3 Times
No display
Main relay error
After 2 minutes 20 seconds of stopped operation, the signal from the outdoor unit is received even though the main relay is off.
-Check if Main Relay is defective. -Controller PCB defective.
4 Times
No display
Power supple frequency
error
The power supply frequency cannot be recognized after 4 seconds of power on. Permanent stop.
-Controller PCB defective.
7 Times
No display
VDD permanent STOP
protection (electric air cleaner)
Electric air cleaner error – When the air cleanness monitor trial protection operates 4 times.
-Check the front panel and ensure that it is closed. -Check IAQ micro switch for open/close operation.
8 Times
21
Reverse VDD (electric air clean
power supply circuit abnormal)
IAQ error code – The air clean operation signal was detected for 1 minute at the time of air clean mode was off.
-Electric air cleaner defective. -Controller PCB defective
