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