DC Inverter Air
Annex 2 Faults Not Resulted from Air Conditioner
Due to the difference of installation, commissioning and actual operating environments, the air conditioner
may present different running states. The following phenomena are not resulted from the abnormity of the
compressor.
1. The system does not work
1) The system does not work immediately after pressing the ON/OFF button;
2) If the indicator light is ON, it presents the normal running state of the air conditioner. The symptom that it
does not work immediately is incurred from the action of safety device of the system to prevent the
overload;
3) The compressor of the air conditioner will automatically start its running three minutes later;
4) If the running indicator light and defrosting/preheating indicator light is ON, it indicates that you have
chosen the heating mode. Because the compressor is unable to run at the very beginning, the under‐
temperature of indoor unit will result in the “anti‐cold wind” protection.
2. White mist in indoor unit
1) Conduct the cooling operation under the condition that the indoor relative humidity is too high (or oily and
dusty place);
2) If there is heavy dirt in the indoor unit, the room temperature will be uneven, and under such a condition, it
is necessary to clean the inside of the indoor unit, which must be performed by the professional
repairman.
3) The air conditioner is switched from defrosting operation into the heating operation;
4) The water from defrosting operation becomes the steam to discharge.
3. Noise of Air Conditioner
1) The air conditioner will give out the lower continuous “Hissing” sound when it is in its automatic operation,
cooling, dehumidifying or heating operation. it is the flowing sound of refrigerants between indoor unit
and outdoor unit;
2) In a short time after the running suspension or during the defrosting operation, the “hissing” sound can be
heard. It is the sound given out by refrigerant when it stops or changes its flow;
3) When the air conditioner is in heating (including the heating in automation mode) or dehumidifying
operations, the “rustle” sound can be heard, and it is the operating sound of the drainage pump.
4) When the air conditioner is running or stops running, the “creak” sound can be heard. It is the expanding or
contracting sound of plastic parts due to the change of temperature;
4. Dust blown from Indoor Unit
The dust in the indoor unit will be blown out when the unit is operated for the first time after it is left unused for
a long time.
5. Odor Emitted from Indoor Unit
The odor absorbed from room, furniture or soot through the air return circulation of indoor unit is emitted
during the running process of the air conditioner.
6. Cooling Mode Converted into Heating Mode
1) In order to prevent the frosting of heat exchanger of indoor unit, it will automatically be converted into the
Blowing Mode and soon restored to Cooling Mode.
2) When the room temperature has dropped to the set temperature, the air conditioner will automatically
shut down the compressor and enter the Blowing state; after the room temperature rises, the compressor
will be restarted. The action of compressor in the heating mode is exactly opposite;
3) In case of any conflict of operating modes in the same control system, the priority is given to the heating
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