To make air conditioner repair possible even for users without relevant experience, the Chinese electrical appliance manufacturer Midea aircon made a list of the most common problems. Next to the symptom, you’ll find possible causes, as well as solutions. Try these actions to find out whether you’re capable of dealing with the issue on your own.
| Symptoms | Cause | Reason |
| The fan speed can not be changed. | Check whether the MODE indicated on the display is “AUTO” or “DRY” | • When the automatic and dry mode is selected, air conditioner automatically selects the fan speed. |
| • The fan speed can be selected during “COOL”, “HEAT” and “FAN ONLY” | ||
| The TEMP indicator does not come on | Check whether the MODE indicated on the display is “FAN ONLY”. | The temperature can not be set during fan only operation. |
| The timer indicators go off after a lapse of time | Check whether the timer operation is started when the ON TIMER is indicated on the display. | When the time set to start the air conditioner is reached, the air conditioner will automatically start and the appropriate indicator will go off. |
| No receiving tone sounds from the indoor unit even when the ON/OFF button is pushed | Check whether the signal transmitter of the remote controller is property directed to the receiver of the indoor unit when the ON/OFF button is pushed. | The transmitting part of the remote controller does not aim at the receiving part of indoor unit. |
| Problem | Solution |
| Air conditioner does not start | Wall plug disconnected. Push plug firmly into wall outlet. |
| House fuse blown or circuit breaker tripped. Replace fuse with time delay type or reset circuit breaker. | |
| Plug Current Device Tripped. Press the RESET button. | |
| Power is OFF. Turn power ON. | |
| Air from unit does not feel cold enough | Room temperature below (11°C). Cooling may not occur until room temperature rises above 62°F(17°C). |
| Temperature sensing behind air filter element touching cold coil. Keep it from the cold coil. | |
| Set to a Lower temperature. | |
| Compressor stopped when changing modes. Wait for 3 minutes after set to the COOL mode. | |
| Air conditioner cooling, but room is too war mice forming on cooling coil behind decorative front | Outdoor temperature below 64°F(1ffC). To defrost the coil, set FAN ONLY mode. |
| Air filter may be dirty. Clean filter. To defrost, set to FAN ONLY mode. | |
| Thermostat set too cold for night-time cooling. To defrost the coil, set to FAN ONLY mode. Then, set temperature to a Higher setting. | |
| Air conditioner cooling, but room is too warm NO ice forming on cooling coil behind decorative front. | Dirty air filter air restricted. Clean air filter. |
| Temperature is set too High, set temperature to a Lower setting. | |
| Air directional louvers positioned improperly. Position louvers for better air distribution. | |
| Front of units is blocked by drapes, blinds, furniture, etc. restricts air distribution. Clear blockage in front of unit. | |
| Doors, windows, registers, etc. Open cold air escapes. Close doors, windows, registers. | |
| Unit recently turned on in hot room. Allow additional time to remove” Stored heat” from walls, ceiling, floor and furniture. | |
| Air conditioner turns on and off rapidly | Dirty air filter air restricted. Clean air filter. |
| Outside temperature extremely hot. Set FAN speed to a Higher setting to bring air past cooling coils more frequently. | |
| Noise when unit is cooling | Air movement sound. This is normal. If too loud, set to a slower FAN setting. |
| Window vibration poor installation. | |
| Water dripping INSIDE when unit is cooling. | Improper installation. Tilt air conditioner slightly to the outside to allow water drainage. |
| Water dripping OUTSIDE when unit Is cooling. | Unit removing large quantity of moisture from humid room. This is normal during excessively humid days. |
| Remote Sensing Deactivating Prematurely (some models) | Remote control not located within range. Place remote control within 20 feet & 180°, radius of the front of the unit. |
| Remote control signal obstructed. Remove obstruction. | |
| Room too cold | Set temperature too low. Increase set temperature. |
| Symptoms | Causes | Handling methods |
| The unit does not work | Power supply fails. | Operate after power resumes. |
| Power switch is not connected. | Connect the power supply properly. | |
| Fuse blows out or circuit breaker snaps off. | Replace the fuse or check whether electric leakage occurs. | |
| The remote controller or the wire controller fails. | Check the remote controller or wire controller. | |
| Air flowing normally but completely can’t cooling | Temperature setting is improper. | Temperature setting is higher than the room temperature in cooling mode. Or temperature setting is lower than the room temperature in heating mode. |
| 3-minute protection of compressor. | Waiting for 3 minutes. | |
| The unit starts or stops frequently | The system is lack of refrigerant. Or there is too much refrigerant in the system. | Fix the leakage places, and charge the proper quantity of refrigerant. |
| Air or non-condensable gas exists in the refrigerant system. | Vacuum the system and charge refrigerant again. | |
| Compressor fails. | Repair or replace the compressor. | |
| The voltage is too high or too low. | Install a voltage regulator. | |
| The refrigerant pipe is obstructed. | Locate and replace that part. | |
| Poor cooling effect | The heat exchanger of outdoor unit or indoor unit is too dirty. | Clean the heat exchanger. |
| The filter is too dirty. | Clean the filter. | |
| Air inlet or air outlet of the indoor/ outdoor unit is blocked. | Remove obstacles to keep well ventilating. | |
| Doors or windows of the room are open. | Close all the windows and doors. | |
| Directly exposed to sunlight. | Use curtain to obstruct sunlight. | |
| Too many heat sources in the room. | Reduce the heat sources. | |
| The outdoor ambient temperature is too high. | The cooling effect is poor but normal. | |
| The system is lack of refrigerant. | Fix the leakage places, and charge the proper quantity of refrigerant. | |
| Poor heating effect | The outdoor ambient temperature is lower than -7‘C. | Use an assistance heating device. |
| Doors or windows of the room are not closed tightly. | Close the doors and windows properly. | |
| The system is lack of refrigerant. | Fix the leakage places, and charge the proper quantity of refrigerant. | |
| The fan speed cannot be changed | Check whether the mode marked on the screen is “AUTO”. | When the “AUTO” mode is selected, the unit will change the fan speed automatically. |
| Check whether the mode marked on the screen is “DEWET”. | When the “DEWET” mode is selected, the unit will change the fan speed automatically. The fan speed can be selected in “COOLING”,”HEATING” and “SUPPLY AIR” mode. | |
| The “ON/OFF” button of remote controller do not work | Check whether the batteries of remote controller are exhausted. | Replace the batteries. |
| The “ON/OFF” lamp extinguishes | Check whether the time set on the timer has expired. | Restart the unit. |
| The “TIMER ON” lamp extinguishes | Check whether the time set on the timer has expired. | It comes to the setting time and the unit stat running automatically. |
| No receiving sounds from the indoor unit even when the “ON/OFF” button is pressed | Check whether the signal transmitter of the remote controller is properly directed to the infrared signal receiver of the indoor unit when the “ON/OFF” button is pressed. | Directly transmit the signal transmitter of the remote controller to the infrared signal receiver of the indoor unit, and then push the “ON/OFF” button twice. |
| The buttons of the remote controller do not work | Check whether the settings are locked. | Push the “LOCK” button again. |
| Problem | Possible Cause | Solutions |
| Air conditioner does not operate at all | Power failure | Wait for power restoring |
| The power supply is disconnected. | Switch on the main power switch | |
| The power fuse is blown. | Change the fuse | |
| The timer is set. | Wait or cancel timer setting | |
| The batteries of the remote control are exhausted | Change the batteries. | |
| Air conditioner does not cool or heat well | The temperature setting is too high or too low. | Set a more comfortable temperature. |
| The air filter is clogged with dust | Clean the filter | |
| The air inlet or outlet of the outdoor unit is blocked | Clear up the block | |
| Doors or windows are open | Close the doors or windows | |
| Air conditioner does not cool or heat at all | The air inlet or outlet of the outdoor unit is blocked | Clear up the block first, then begin to operate. |
| Three-minute protection feature | Wait for a while | |
| Unappropriated temperature setting | Set the temperature properly | |