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.
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.
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 |
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Air does not come outIn HEAT operation
When the air conditioner operates immediately after the circuit breaker is turned on
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The air conditioner does not operate. (OPERATION lamp is off.)
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Operation stopped suddenly. (OPERATION lamp is on.)
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Operation stopped suddenly. (OPERATION lamp flashes.)
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Mist comes out of the indoor unit
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Cooling (Heating) effect is poor
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Remote controller does not work properly
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
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The ON/OFF TIMER does not operate according to the settings
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An abnormal functioning happens during operation
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The indoor unit gives out odor
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The outdoor fan rotates while the air conditioner is not in operationAfter operation is stopped
While the air conditioner is not in operation
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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
- When CANCEL is held down for about 5 seconds, "00" blinks in the temperature display section.
- 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.
Error Code Definitions
CODE |
MEANING |
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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 |