AIRSTAGE Operation Manual

ASTG18LVCB / AOTG18LVCB

Wall Mounted Room Air Conditioner
Operating guide, timer functions, airflow settings, cleaning and troubleshooting
This article provides a practical overview of the operating instructions for the ASTG18LVCB indoor unit matched with the AOTG18LVCB outdoor unit. The full operating manual is P/N 9318657005-03.

Applies to

Indoor unitASTG18LVCB
Outdoor unitAOTG18LVCB
RefrigerantR410A
Manual9318657005-03
Safety: Installation, repair and servicing must be carried out by qualified personnel. If there is a burning smell or other malfunction, stop operation, switch off the electrical breaker and contact authorised service personnel.

1. Basic operation

Start the air conditioner

  1. Press the START/STOP button on the wireless remote controller.
  2. Press MODE to select the required operating mode.
  3. Use the SET TEMP. buttons to adjust the temperature.
  4. Press FAN to select the fan speed.
SettingOptions / Range
Operating modesAUTO, COOL, DRY, HEAT, FAN
AUTO temperature18–30°C
Heating temperature16–30°C
Cooling / Dry temperature18–30°C
Fan speedsAUTO, HIGH, MED, LOW, QUIET
In FAN mode the thermostat cannot be used to control room temperature. In DRY mode the fan speed cannot be changed manually.

AUTO mode

When AUTO is selected, the unit assesses room conditions and automatically selects cooling, dry, heating or monitor operation to maintain the set temperature.

Super Quiet

Select QUIET with the FAN button to reduce indoor airflow and operating sound. Cooling and heating performance may be reduced while Super Quiet operation is active.

2. Timer operation

Set the remote controller clock before using timer functions.

TimerWhat it does
ON TimerStarts the air conditioner at the selected time.
OFF TimerStops the air conditioner at the selected time.
Program TimerCombines one ON and one OFF timer transition within a 24-hour period.
Sleep TimerGradually adjusts the set temperature for comfort, then stops the unit when the selected time expires.

To cancel a timer, use the TIMER MODE button to select CANCEL.

3. Useful functions

10°C Heat

Press the 10°C HEAT button to help prevent the room temperature from falling too far. To stop 10°C Heat operation, press START/STOP.

While 10°C Heat is active, only airflow direction adjustment is available. Heating will not operate if the room temperature is already high enough.

Economy operation

Press ECONOMY during normal operation to reduce energy use. At maximum output, Economy operation is approximately 70% of normal air conditioner output for cooling and heating.

Swing operation

Press SWING to move the vertical airflow louvers automatically. During cooling/dry operation the swing range is between positions 1 and 3; during heating it is between positions 3 and 6.

Manual Auto operation

If the wireless remote controller is unavailable, press and hold the indoor unit MANUAL AUTO button for approximately three seconds. The unit will operate in AUTO mode, with AUTO fan speed and a standard thermostat setting of 24°C.

4. Airflow direction

  • Use the remote controller SET button for vertical airflow direction.
  • Cooling/Dry: recommended positions 1, 2 or 3.
  • Heating: recommended positions 4, 5 or 6.
  • Horizontal right-left airflow is adjusted manually after the air conditioner has stopped completely.
Do not manually force the vertical airflow louvers. During Cooling or Dry operation, leaving the louvers in the heating range for extended periods may cause condensation and water droplets at the outlet.

5. Cleaning and care

  1. Stop the air conditioner and switch off the electrical breaker.
  2. Open the intake grille and remove the air filters.
  3. Remove dust using a vacuum cleaner, or wash the filters with neutral detergent and warm water.
  4. Allow washed filters to dry thoroughly in a shaded location.
  5. Refit the filters and close the intake grille.

Under normal use, the air filters should be cleaned approximately every two weeks.

Air cleaning filters

The manual identifies replacement air cleaning filter UTR-FA16-3. The air cleaning filters are described as disposable, with replacement recommended every three years to maintain the air cleaning effect.

6. Troubleshooting

SymptomCheck / Explanation
Does not start immediatelyA protection delay of about three minutes may occur after stopping/restarting the unit or restoring power.
Weak airflow in heatingThe fan may operate at very low speed while the indoor unit warms up, or when room temperature is above the thermostat setting.
Heating stops temporarilyAutomatic defrost may stop heating for approximately 7–15 minutes. The OPERATION lamp flashes and the DEFROST lamp illuminates.
Water from outdoor unit in heatingThis can occur during automatic defrost operation and is normal.
Poor cooling or heatingCheck the air filter, intake/outlet obstruction, temperature setting, open doors/windows, sunlight and whether QUIET mode is active.
Remote control response differsCheck that the remote controller batteries are correctly installed and are not flat.
If the problem continues after the basic checks, or if the OPERATION and TIMER indicator lamps flash, stop the system, switch off the electrical breaker and contact authorised service personnel.

7. Operating notes

  • Heating performance will reduce as outdoor air temperature falls.
  • Automatic defrost may occur in low outdoor temperature and high humidity conditions.
  • After a power interruption, the air conditioner automatically restarts in its previous operating mode when power is restored.
  • If a power interruption occurs during timer operation, the timer is reset and may need to be set again.
Full Operation Manual
Refer to the attached PDF: ASTG12_18_22LVCB OM 9318657005_En.pdf