Troubleshooting

Resolve every common problem with your Mini Split with a variety of options

Possible Causes Test Methods/ Remedy
Power failure Test Voltage
The main power tripped Close the power switch
Loose Connections Inspect connection-tighten
Faulty Transformer Change transformer
Blown fuse or varistor Inspect fuse, type and size
Shorted or broken wires Test circuit with tester
Safety device opens Test continuity of safety device
Possible Causes Test Methods /Remedy
Loose connections Inspect connection -tighten
Faulty transformer Change the transformer
The voltage is too high or too low Test voltage
Interference from cell phone towers and remote boosters Reconnect the power or press ON/OFF button on remote control to restart operation.
Possible Causes Test Methods /Remedy
Shorted or broken wires Test circuit with tester
Shorted or open capacitor Test capacitor with tester
Faulty thermostat/room temperature sensor Test continuity of thermostat/sensor & wiring
Faulty magnetic contractor for computer Test continuity of coils and contacts
Shorted or grounded compressor Replace the compressor
Possible Causes Test Methods /Remedy
The remote control is powered off Replace the battery of the remote control
Broken remote control Replace the remote control
Possible Causes Test Methods /Remedy
Faulty thermostat/room temperature sensor Test continuity of thermostat/sensor & wiring
Faulty magnetic contractor for computer Test continuity of coils and contacts
Shorted or broken wires Test circuit with tester
Possible Causes Test Methods /Remedy
The setting temperature is higher/lower than the room’s (cooling/heating) Adjust the setting temperature
The ambient temperature is too high/low when the mode is cooling/heating Turn the AC later
Fan Mode is ON Adjust to COOL mode
Possible Causes Test Methods /Remedy
Shorted or broken wires Test circuit with tester
Shorted or open capacitor Check capacitor with tester
Faulty magnetic contractor for fan Test continuity of coil and contacts
Shorted or grounded fan motor Check resistance with multi meters
Possible Causes Test Methods /Remedy
Shorted or broken wires Test circuit with tester
Shorted or open capacitor Check capacitor with tester
Faulty magnetic contractor for fan Test continuity of coil and contacts
Shorted or grounded fan motor Check resistance with multi meters
Faulty thermostat/room temperature sensor Test continuity of thermostat/sensor & wiring
Possible Causes Test Methods /Remedy
Low Voltage Test voltage
The voltage is too high or too low Test voltage
Faulty magnetic contractor for fan Test continuity of coil and contacts
The setting temperature is higher/lower than the room’s (cooling/heating) Adjust the setting temperature
Shortage of refrigerant Leak test
The ambient temperature is too high/low when the mode is cooling/heating Turn the AC later
Restricted liquid line Replace restricted part
Overcharge of refrigerant Change charged refrigerant volume
Dirty or partially blocked condenser Clean condenser or remove obstruction
Expansion valve and capillary tube closed completely Replace valve
Leaking power element on expansion valve Replace valve
Possible Causes Test Methods /Remedy
Shortage of refrigerant Leak test
Overcharge of refrigerant Change charged refrigerant volume
Faulty magnetic contractor for fan Test continuity of coil and contacts
Shorted or grounded fan motor Check resistance with multi meters
Dirty or partially blocked condenser Clean condenser or remove obstruction
Low Voltage Test voltage
Possible Causes Test Methods /Remedy
Air or incompressible gas in refrigerant cycle Purge evacuate and recharge
Overcharge of refrigerant Change charged refrigerant volume
Short cycling of condensing air obstruction Remove obstruction to airflow
High temperature condensing medium Remove obstruction in air or water flow
Dirty or partially blocked condenser Clean condenser or remove obstruction
Insufficient condensing medium Remove obstruction in air or water flow
Possible Causes Test Methods /Remedy
shortage of refrigerant Leak test
Insufficient compressor Test compressor efficiency
Possible Causes Test Methods /Remedy
Insufficient compressor Test compressor efficiency
Poor installation of feeler bulb Fix feeler bulb
Overcharge of refrigerant Change charged refrigerant volume
Heavy load condition Check heat load
Possible Causes Test Methods /Remedy
Shortage of refrigerant Leak test
Dirty air filters Clean or replace
Dirty evaporator coil Clean coil
Insufficient air through evaporator Check fan
Shortage of refrigerant Leak test
Expansion valve obstructed Replace valve
Restricted liquid line Replace restricted part
Dirty or partially blocked condenser Clean condenser or remove obstruction
Expansion valve and capillary tube closed completely Replace valve
Leaking power element on expansion valve Replace valve
Possible Causes Test Methods /Remedy
Shortage of refrigerant Leak test
Dirty air filters Clean or replace
Dirty condenser fins Clean fins
Dirty evaporator coil Clean coil
Insufficient air through evaporator Check fan
Restricted liquid line Replace restricted part
Dirty or partially blocked condenser Clean condenser or remove obstacle
Air or incompressible gas in refrigerant cycle Purge, evacuate and recharge
Short cycling of condensing air Remove obstruction to air flow
Insufficient compressor Test compressor efficiency
Heavy load condition Check heat load
Poor choices of capacity Choose AC of larger capacity or number of ACs.
The setting temperature is higher/lower than the room’s (cooling/heating) Adjust the setting temperature
The ambient temperature is too high/low when the mode is cooling/heating Turn the AC later
Silence function is activated (optional function) Turn off the SILENCE function
Possible Causes Test Methods /Remedy
Faulty thermostat/room temperature sensor Test continuity of thermostat/sensor & wiring
Wrong setting place of temperature sensor Place the temperature sensor at the centre of the air inlet
Possible Causes Test Methods /Remedy
Over charge of refrigerant Change charged refrigerant volume
Broken compressor internal part Replace compressor
Loosen hold down bolts and or screws Tighten bolts or screws
Shipping plates remain attached Remove them
Contact of piping unit other piping or external plate Rectify piping so as not to contact each other or with external plate
Possible Causes Test Methods /Remedy
Loose connections Inspect connection-tighten
Shorted or broken wires Test circuits with testers
Faulty stepping motor Replace the stepping motor
Possible Causes Test Methods /Remedy
The voltage is too high or too low Test voltage
The ambient temperature is too high/low when the mode is cooling/heating Turn the AC later
Silence function is activated (optional function) Turn off the SILENCE function
The air inlet or outlet of either units blocked Remove the obstacle
Possible Causes Test Methods /Remedy
Loosen hold down bolts and/or screws Tighten bolt and screws
Shipping plates remain attached Remove them
Possible Causes Test Methods /Remedy
Mode is changed Turn off and on then change the mode

When the indoor unit encounters a recognized error, the operation lamp will flash in a corresponding series, the timer lamp may turn on or begin flashing, and an error code will be displayed. Following are some general error codes and their troubleshooting.

Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.

Recommended parts to prepare:

  • Indoor PCB
  • Outdoor PCB

Troubleshooting and repair:

Shut off the power supply and turn it on 2 minutes later.

Is it still displaying the error code? If  YES then replace the indoor main.

Troubleshooting and repair of compressor driven chip EEPROM parameter error and communication error between outdoor main chip and compressor driven chip are same as F4

Description: Indoor unit cannot communicate with outdoor unit

Recommended parts to prepare:

  • Indoor PCB
  • Outdoor PCB
  • Reactor

Description: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time intervals is abnormal.

Recommended parts to prepare:

  • Connection wires
  • PCB

Troubleshooting and repair:

Note: E2 zero crossing detection error is only valid for the unit with AC fan motor, for other models, this error is invalid.

Description: Fan speed is operating outside of normal range- When indoor / outdoor fan speed keeps too low or too high for a certain time, the unit will stop and the

LED will display the failure.

Recommended parts to prepare:

  • Connection wires
  • Fan assembly
  • Fan motor
  • PCB

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Problem- Open circuit or short circuit of temperature sensor

Description: Indoor room temperature sensor T1 is in open circuit or has short circuited. If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.

Recommended parts to prepare:

  • Connection wires
  • Sensors
  • PCB

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole. This picture and the value are only for reference, actual appearance and value may vary.

Problem- Open circuit or short circuit of temperature sensor

Description: Indoor room temperature sensor T1 is in open circuit or has short circuited. If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.

Recommended parts to prepare:

  • Connection wires
  • Sensors
  • PCB

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole. This picture and the value are only for reference, actual appearance and value may vary.

Problem- Indoor PCB / Display board communication error

Description: Indoor PCB does not receive feedback from the display board.

Recommended parts to prepare:

  • Communication wire
  • Indoor PCB
  • Display board

Troubleshooting and repair:

Problem- Refrigerant Leakage Detection

Description: Define the evaporator coil temperature T2 of the compressor just starts running as Tcool.

In the beginning 5 minutes after the compressor starts up, if T2 < Tcool-1°C(1.8°F) does not keep continuous 4 seconds and compressor running frequency higher than 50Hz does not keep for 3 minutes, and this situation happens 3 times, the display area will show “EC” and AC will turn off.

 

Recommended parts to prepare:

  • T2 sensor
  • Indoor PCB
  • Additional refrigerant

 

Troubleshooting and repair:

Problem- Overload current protection

 

Description: An abnormal current rise is detected by checking the specified current detection circuit.

Recommended parts to prepare:

  • Outdoor PCB
  • Connection wires
  • Compressor

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Problem- Open circuit or short circuit of temperature sensor

Description: Indoor room temperature sensor T1 is in open circuit or has short circuited. If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.

Recommended parts to prepare:

  • Connection wires
  • Sensors
  • PCB

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole. This picture and the value are only for reference, actual appearance and value may vary.

Problem- Condenser coil temperature sensor T3 is in open circuit or has short circuited

Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.

Recommended parts to prepare:

  • Connection wires
  • Sensors
  • PCB

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole. This picture and the value are only for reference, actual appearance and value may vary.

Problem- Compressor discharge temperature sensor TP is in open circuit or has short circuited

 

Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.

Recommended parts to prepare:

  • Connection wires
  • Sensors
  • PCB

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole. This picture and the value are only for reference, actual appearance and value may vary.

Problem- Outdoor unit EEPROM parameter error

Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.

Recommended parts to prepare:

  • Indoor PCB
  • Outdoor PCB

Troubleshooting and repair:

Shut off the power supply and turn it on 2 minutes later.

Is it still displaying the error code? If  YES then replace the indoor main.

Troubleshooting and repair of compressor driven chip EEPROM parameter error and communication error between outdoor main chip and compressor driven chip are same as F4.

Problem- The outdoor fan speed is operating outside of the normal range (for

some models)

Description: When indoor / outdoor fan speed keeps too low or too high for a certain time, the unit will stop and the

LED will display the failure.

Recommended parts to prepare:

  • Connection wires
  • Fan assembly
  • Fan motor
  • PCB

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Problem- IPM malfunction or IGBT over-strong current protection

Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows

“P0” and the AC turn off.

Recommended parts to prepare:

  • Connection wires
  • IPM module board
  • Outdoor fan assembly
  • Compressor
  • Outdoor PCB

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Problem- Over voltage or over low voltage protection

Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit.

Recommended parts to prepare:

  • Power supply wires
  • IPM module board
  • PCB
  • Reactor

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Problem- High temperature protection of IPM module

Description: If the temperature of IPM module is higher than a certain value, the LED will display the failure.

Recommended parts to prepare:

  • Outdoor PCB
  • IPM module board

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole

Problem- Inverter compressor drive error

Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication

signal detection, voltage detection, compressor rotation speed signal detection and so on.

Recommended parts to prepare:

  • Connection wires
  • IPM module board
  • Outdoor fan assembly
  • Compressor
  • Outdoor PCB

Troubleshooting and repair:

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

The Unit has a 3-minute protection feature that prevents the unit from overloading. The unit cannot be restarted within three minutes of being turned off.

1-The unit may change its setting to prevent frost from forming on the unit. Once the temperature increases, the unit will start operating in the previously selected mode again.

2-The set temperature has been reached, at which point the unit turns off the compressor. The unit will continue operating when the temperature fluctuates again.

In humid regions, a large temperature difference between the room’s air and the conditioned air can cause white mist.

When the unit restarts in HEAT mode after defrosting, white mist may be emitted due to moisture generated from the defrosting process.

1-A rushing air sound may occur when the louver resets its position.

2-A squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction of the unit’s plastic parts.

1-Low hissing sound during operation: This is normal and is caused by refrigerant gas flowing through both indoor and outdoor units.

2- Low hissing sound when the system starts, has just stopped running, or is defrosting: This noise is normal and is caused by the refrigerant gas stopping or changing direction.

3- Squeaking sound: Normal expansion and contraction of plastic and metal parts caused by temperature changes during operation can cause squeaking noises.

The unit will make different sounds based on its current operating mode.

The unit may accumulate dust during extended periods of non-use, which will be emitted when the unit is turned on. This can be mitigated by covering the unit during long periods of inactivity.

1-The unit may absorb odors from the environment (such as furniture, cooking, cigarettes, etc.) which will be emitted during operations.

2-The unit’s filters have become moldy and should be cleaned.

During operation, the fan speed is controlled to optimize product operation

Interference from cell phone towers and remote boosters may cause the unit to malfunction.

In this case, try the following:

  • Disconnect the power, then reconnect.
  • Press ON/OFF button on remote control to restart operation.

NOTE: If problem persists, contact a local dealer or your nearest customer service center. Provide them with a detailed description of the unit malfunction as well as your model number.

1-Temperature setting may be higher than ambient room temperature

2-Lower the temperature setting

3-The heat exchanger on the indoor or outdoor unit is dirty

Clean the affected heat exchanger

4-The air filter is dirty

Remove the filter and clean it according to instructions

5-The air inlet or outlet of either unit is blocked

Turn the unit off, remove the obstruction and turn it back on

6- Doors and windows are open

Make sure that all doors and windows are closed while operating the unit

Excessive heat is generated by sunlight

Close windows and curtains during periods of high heat or bright sunshine

7-Too many sources of heat in the room (people, computers, electronics, etc.)

Reduce amount of heat sources

8-Low refrigerant due to leak or long-term use

Check for leaks, re-seal if necessary and top off refrigerant

SILENCE function is activated (optional function)

SILENCE function can lower product performance by reducing operating frequency. Turn off SILENCE function.

1-Power failure Wait for the power to be restored

2- The power is turned off Turn on the power

3-The fuse is burned out Replace the fuse

4-Remote control batteries are dead Replace batteries

5-The Unit’s 3-minute protection has been activated

Wait three minutes after restarting the unit

6- Timer is activated Turn timer off

1-There’s too much or too little refrigerant in the system
Check for leaks and recharge the system with refrigerant.
2-Incompressible gas or moisture has entered the system.
Evacuate and recharge the system with refrigerant
3-The compressor is broken Replace the compressor
4-The voltage is too high or too low
Install a manostat to regulate the voltage

1-The unit may stop operation or continue to run safely. If the indicator lamps continue to flash or error codes appear, wait for about 10 minutes. The problem may resolve itself.

2- If not, disconnect the power, then ,connect it again. Turn the unit on.

If the problem persists, disconnect the power and contact your nearest customer service center.

1-The outdoor temperature is extremely low Use auxiliary heating device

2-Cold air is entering through doors and windows Make sure that all doors and windows are closed during use

3-Low refrigerant due to leak or long-term use Check for leaks, re-seal if necessary and top off refrigerant