Troubleshooting for Single and Multi Zone LV Systems

Indoor Unit

Possible Sounds

Flowing Water

  • Generated because the refrigerant in the air conditioner is flowing. 
  • This is a pumping sound of the water in the air conditioner it is heard when the water is pumped out from the air conditioner in cooling or drying operation.
  • The refrigerant flows in the air conditioner even if the air conditioner is not working when the indoor units in other rooms are in operation.

Blowing

  • Generated when the flow of the refrigerant in the air conditioner is switched over.

Ticking

  • Generated when the size of the air conditioner slightly expands or shrinks as a result of temperature changes.

Whistling Sound

  • Generated when refrigerant flows during defrosting operation.

Clicking Sound During Operation or Idle Time

  • Generated when the refrigerant control valves or the electrical parts operate.

Clopping Sound

  • Heard from the inside of the air conditioner when the exhaust fan is activated while the room doors are closed. Open the window or turn off the exhaust fan.
LV series Wall Mount

The flaps do not start swinging immediately. The flaps move soon after startup.

The air conditioner is adjusting the position of the flaps. The flaps will start moving soon.

The HEAT operation stops suddenly and a flowing sound is heard.

The outdoor unit is taking away the frost. The HEAT operation starts after the frost on the outdoor unit is removed. You should wait for about 4 to 12 minutes.

Operation does not start soon.

  • When “ON/OFF” button was pressed soon after operation was stopped. 
  • When the mode was reselected.
  • This is to protect the air conditioner. You should wait for about 3 minutes.

Outdoor Unit

Operating sound is loud

  •   When frost forms on the heat exchanger of the outdoor unit, the operating sound level increases slightly.

The outdoor unit emits water or steam

  • In HEAT operation: The frost on the outdoor unit melts into water or steam when the air conditioner is in defrost operation.
  • In COOL or DRY operation: Moisture in the air condenses into water on the cool surface of outdoor unit piping and drips.
outdoor unit

Troubleshooting measures are classified into the following two types on a remedial basis.

Take an appropriate measure according to the symptom.

NOT MALFUNCTION- the following problems do not indicate a problem with the unit

CHECK- check again before calling us to repair

Air does not come out

In HEAT operation

  • The air conditioner is warming up. Wait for about 1 to 4 minutes.
  • During defrosting operation, hot air does not fl ow out of the indoor unit.

When the air conditioner operates immediately after the circuit breaker is turned on

  • The air conditioner is preparing to operate. Wait for about 3 to 20 minutes.

The air conditioner does not operate. (OPERATION lamp is off.)

  • Is a breaker off or a fuse blown?     
  • Is there a power failure?   
  • Are batteries set in the remote controller?   
  • Is the timer setting correct?

Operation stopped suddenly. (OPERATION lamp is on.)

  • For system protection, the air conditioner may stop operating on a sudden large voltage fluctuation. It automatically resumes operation in about 3 minutes.

Operation stopped suddenly. (OPERATION lamp flashes.)

  • Are the air filters clean? Clean the air filters.
  • Is there anything to block the air inlet or the outlet of the indoor and the outdoor units? 
  • Turn the bleaker off and take all obstacles away. Then turn it on again and try operating the air conditioner with the remote controller. If the lamp still fl ashes, call the service shop where you purchased the air conditioner.
  • Are operation modes all the same for indoor units connected to outdoor units in the multi system?
  • If not, set all indoor units to the same operation mode and confirm that the lamps flash.
  • When the operation mode is in “AUTO”, set all indoor unit operation modes to “COOL” or “HEAT” for a moment and check again that the lamps are normal. If the lamps stop flashing after the above steps, there is no malfunction.

Mist comes out of the indoor unit

  • This happens when the air in the room is cooled into mist by the cold airflow during COOL operation.      
  • This is because the air in the room is cooled by the heat exchanger and becomes mist during defrosting operation.

Cooling (Heating) effect is poor

  • Are the air filters clean?    
  • Is there anything to block the air inlet or the outlet of the indoor and the outdoor units? 
  • Is the temperature setting appropriate?  
  • Are the windows and doors closed?    
  • Are the airflow rate and the airflow direction set appropriately?

Remote controller does not work properly

  • No remote controller signals are displayed. 
  • Remote controller sensitivity is low. „    
  • Display is low in contrast or blacked out.
  • Display runs out of control.

The batteries are dying and the remote controller is malfunctioning. Replace all the batteries with new, size AAA.LR03 (alkaline).

HEAT operation cannot be selected, even though the unit is heat pump model

  • Slide the DIP switch to the left as shown in the illustration so that the HEAT operation can be selected with the
    “MODE” button.

 

The ON/OFF TIMER does not operate according to the settings

  • Check if the ON/OFF TIMER and the WEEKLY TIMER are set to the same time.
    Change or deactivate the settings in the WEEKLY TIMER.

An abnormal functioning happens during operation

  • The air conditioner may malfunction with lightning or radio waves. Turn the breaker off, turn it on again and try operating the air conditioner with the remote controller. 

The indoor unit gives out odor

  • This happens when smells of the room, furniture, or cigarettes are absorbed into the unit and discharged with the airflow.
  • (If this happens, have the indoor unit washed by a technician from the service shop where you purchased the air conditioner.)
 

The outdoor fan rotates while the air conditioner is not in operation

After operation is stopped

  • The outdoor fan continues rotating for another 60 seconds for system protection.

While the air conditioner is not in operation

  • When the outdoor temperature is very high, the outdoor fan starts rotating for system protection.
 

 

Call us immediately if:

  • When an abnormality (such as a burning smell) occurs, stop operation and turn the breaker off.
  • Continued operation in an abnormal condition may result in malfunctioning, electric shocks or fire.
  • Consult the service shop where you purchased the air conditioner. „    
  • Do not attempt to repair or modify the air conditioner by yourself.
  • Incorrect work may result in electric shocks or fire.
  • Consult the service shop where you purchased the air conditioner.

Turn off the breaker and immediately call us if:

  • The power cord is abnormally hot or damaged.
  • An abnormal sound is heard during operation.
  • The safety breaker, a fuse, or the ground leakage breaker cuts off the operation frequently.
  • A switch or a button often fails to work properly.   
  • There is a burning smell. 
  • Water leaks from the indoor unit.

„ After a power failure:

  • The air conditioner automatically resumes operation in about 3 minutes. Wait for it to restart.

If lightning strikes:

  • If lightning may strike the neighboring area, stop operation and turn the breaker off for system protection.

„

 

Fault diagnosis by remote controller

  1. When CANCEL is held down for about 5 seconds, "00" blinks in the temperature display section.
  2. Press CANCEL repeatedly until a continuous beep is produced. The code indication changes as displayed in the following table, and notifies with a long beep.
LV series remote

Error Code Definitions

CODE

MEANING

SYSTEM  
00 NORMAL
UA INDOOR-OUTDOOR UNIT COMBINATION FAULT
U0 REFRIGERANT SHORTAGE
U2 DROP VOLTAGE OR MAIN CIRCUIT OVERVOLTAGE
U4 FAILURE OF TRANSMISSION (BETWEEN INDOOR UNIT AND OUTDOOR UNIT)
INDOOR UNIT  
A1 INDOOR PCB DEFECTIVENESS
A5 HIGH PRESSURE CONTROL OR FREEZE-UP PROTECTOR
A6 FAN MOTOR FAULT
C4 FAULTY HEAT EXCHANGER TEMPERATURE SENSOR
C9 FAULTY SUCTION AIR TEMPERATURE SENSOR
OUTDOOR UNIT  
EA COOLING-HEATING SWITCHING ERROR
E1 CIRCUIT BOARD FAULT
E5 OL STARTED
E6 FAULTY COMPRESSOR START UP
E7 DC FAN MOTOR FAULT
E8 OVERCURRENT INPUT
F3 HIGH TEMPERATURE DISCHARGE PIPE CONTROL
F6 HIGH PRESSURE CONTROL (IN COOLING)
H0 SENSOR FAULT
H6 OPERATION HALT DUE TO FAULTY POSITION DETECTION SENSOR
H8 DC CURRENT SENSOR FAULT
H9 FAULTY SUCTION AIR TEMPERATURE SENSOR
J3 FAULTY DISCHARGE PIPE TEMPERATURE SENSOR
J6 FAULTY HEAT EXCHANGER TEMPERATURE SENSOR
L3 ELECTRICAL PARTS HEAT FAULT
L4 HIGH TEMPERATURE AT INVERTER CIRCUIT HEATSINK
L5 OUTPUT OVERCURRENT
P4 FAULTY INVERTER CIRCUIT HEATSINK TEMPERATURE SENSOR

 

If the fault persists, please contact us here!