Manual for AU_7UF

Manual for AU_7UF

Brand: AIRSTAGE

Category: Air Conditioner

Document Type: Manual

Language: EN

Uploaded: Nov. 21, 2025, 6:45 p.m.

Basic Operation:

Loading Batteries: Slide open the compartment, insert 2 R03/LR03 batteries following polarity, and slide the lid back.

Setting Current Time: Press TIME ADJUST, then the button, then TIME ADJUST again.

Remote Controller Holder: Insert and press to set; slide up and pull to remove.

Manual Auto Operation: Press the MANUAL AUTO button on the main unit. Press again to stop. Operates like AUTO mode with fan speed set to AUTO and temperature to 23°C.

Operation Control: Press START/STOP to begin or end operation. Press the button to select operation modes (AUTO, COOL, DRY, FAN, HEAT). Use the button to set temperature. Press the FAN button to adjust fan speed (AUTO, HIGH, MED, LOW). Use the AIR DIRECTION button for swing operation.

Timers: Use the SLEEP TIMER button to set an automatic stop time. Use the PROGRAM TIMER buttons to set combined ON and OFF timers.

Troubleshooting and error codes

Symptom Cause and Action
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 them on again, the protection circuit will operate for about 3 minutes, preventing unit operation during that period.
Noise is heard.
  • During operation and immediately after stopping the unit, the sound of water flowing in the air conditioner's piping may be heard. Also, noise may be particularly noticeable for about 2 to 3 minutes after starting operation (sound of coolant flowing).
  • During operation, a slight squeaking sound may be heard. This is the result of minute expansion and contraction of the front cover due to temperature changes.
  • *During Heating operation, a sizzling sound may be heard occasional. This 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.
Mist or steam are emitted.
  • During Cooling operation or Dry 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.
  • *During Heating operation, the outdoor unit's fan may stop, and steam may be sent rising from the unit. This is due to Automatic Defrosting operation.
  • *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 set temperature, the outdoor unit will stop, and the indoor unit's fan will stop. If you wish to warm the room further, set the temperature for a higher setting.
  • *During Heating operation, the unit will temporarily stop operation (between 2 and 16 minutes) as the Automatic Defrosting mode operates. During Automatic Defrosting operation, the OPERATION indicator will flash.
Airflow is weak or stops.
  • The fan may operate at very low speed during Dry operation or when the unit is monitoring the room temperature.
  • In the monitor AUTO operation, the fan will operate at very low speed.
Water is produced from the outdoor unit. *During Heating operation, water may be produced from the outdoor unit due to Automatic Defrosting operation.
Doesn't operate at all.
  • Has there been a power failure?
  • Has a fuse blown out, or a circuit breaker been tripped?
  • Is the main power switch set to the OFF position?
  • Is the timer operating?
Poor Cooling (or *Heating) performance.
  • Is the air filter dirty?
  • Are the air conditioner's intake grille or outlet port blocked?
  • Is there a window or door open?
  • In the case of Cooling operation, is a window allowing bright sunlight to enter? (Close the curtains.)
  • In the case of cooling operation, are there heating apparatus and computers inside the room, or are there too many people in the room?
The unit operates differently from the remote controller's setting.
  • Are the remote controller's batteries dead?
  • Are the remote controller's batteries loaded properly?
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