Airstage air conditioner troubleshooting

The air conditioner can break down while service. Airstage air conditioner troubleshooting system allows to reveal the cases, when one is to immediately stop the operation of an appliance and consult a specialized service, and the cases, which may not be signs of malfunction, but require an additional check.

The following conditions are not breakdowns or operation failures.

Doesn't operate immediately:If the unit is stopped and then immediately started again, the compressor will not operate for about 3 minutes, in order to prevent fuse blowouts.
Whenever the electrical breaker is turned off then on again, the protection circuit will operate for about 3 minutes, preventing unit operation during that period.
Airflow is weak or stops:When Heating operation is started, indoor unit's fan may temporarily stop, to allow internal parts to warm up.
During Heating operation, if the room temperature rises above the thermostat setting, the outdoor unit will stop, and the indoor unit's fan will stop. If you wish to warm the room further, set the thermostat for a higher setting.
During oil recovery operation, the air flow may stop for approximately 10 minutes.
During Heating operation, the unit will temporarily stop operation (between 4 and 15 minutes) as the Automatic Defrosting mode operates.
The fan may operate at low speed during Dry operation or when the unit is monitoring the room's temperature.
In the monitor AUTO operation, the fan will operate at low speed.
Flashing lamps:The OPERATION indicator lamp (red) flashes: An oil recovery operation is being performed
The OPERATION indicator lamp (red) flashes: An automatic defrosting operation is being per formed.

The OPERATION indicator lamp
(red) and TIMER indicator lamp
(green) are flashing alternately: It has recovered from a power outage.

The OPERATION indicator lamp
(red) and TIMER indicator lamp
(green) are flashing
simultaneously: It is operating in trial operation mode.
Ask a manager as there may be maintenance
being conducted.

The OPERATION indicator lamp
(red) lights up and the TIMER
indicator lamp (green) flashes: This is the standby state.
Noise is heard:In the following conditions there are sounds of water flowing from the indoor unit and the operation sound becomes loud. These are the sounds of the flowing of refrigerant.
When operation starts
When oil recovery operation finishes
When automatic defrosting operation finishes
During operation, a slight squeaking sound may be heard. This is the result of minute expansion and contraction of the panel due to temperature changes.
During Heating operation, a sizzling sound may be heard occasionally. This sound is produced by the Automatic Defrosting operation.
Smells:Some smell may be emitted from the indoor unit. This smell is the result of room smells (furniture, tobacco, etc.) which have been taken into the air conditioner.
Fog comes out of the indoor unit:During Cooling operation, a thin mist may be seen emitted from the indoor unit.
This results from the sudden Cooling of room air by the air emitted from the air conditioner, resulting in condensation and misting.
Steam comes out of the indoor unit:During Heating operation, the outdoor unit's fan may stop, and steam may be seen rising from the unit. This is due to the Automatic Defrosting operation.
Water is produced from the outdoor unit:During Heating operation, water may be produced from the outdoor unit due to the Automatic Defrosting operation.


Low ambient coolingWhen the outdoor temperature drops, the outdoor unit's fans may switch to Low Speed, or one of the fans may stop
Heating performanceHeating mode operates on the heat-pump principle, absorbing heat from outdoor air and transferring that heat indoors. As a result, the operating performance is reduced as outdoor air temperature drops. If you feel that insufficient heating performance is being produced, we recommend you use this air conditioner in conjunction with another kind of heating appliance.
Heating mode heat your entire room by recirculating air throughout the room, with the result that some time may be required after first starting the air conditioner until the room is heated.
Microcomputer-controlled automatic defrostingWhen using the Heating mode under conditions of low outdoor air temperature high humidity, frost may form on the outdoor unit, resulting in reduced operating performance. In order to prevent this kind of reduced performance, this unit is equipped with a Microcomputer-controlled automatic defrosting function. If frost forms, the air conditioner will temporarily stop, and the defrosting circuit will operate briefly (for about 4 to 15 minutes).
During Automatic Defrosting operation, the OPERATION indicator lamp (red) will flash.
Oil recovery operationPeriodically, the oil recovery operation is performed in order to return compressor oil to the outdoor unit.
During oil recovery operation, the OPERATION indicator lamp (red) will flash (for about 10 minutes).

Temperature and humidity range

The temperature and humidity required for operating this product is as shown in the following table.

 Cooling/Dry ModeHeating Mode
Outdoor temperaturePlease refer to the specification of outdoor units.Please refer to the specification of outdoor units.
Indoor temperatureAbout 18 to 32°CAbout 16 to 30°C
Indoor humidityAbout 80% or less

If the air conditioner is operated under higher temperature conditions than those listed, the built-in protection circuit may operate to prevent internal circuit damage. Also, during Cooling and Dry modes, if the unit is used under conditions of lower temperature than those listed above, the heat-exchanger may freeze, leading to water leakage and other damage.
If the unit is used for long periods under high-humidity conditions, condensation may form on the surface of the indoor unit, and drip onto the floor or other objects underneath.
Do not use this unit for any purposes other than the Cooling, Heating, Dehumidifying, and air-circulation of rooms in ordinary dwellings.