Question 1

What do the symbols and indicators of the DAITSU ASD 18U air conditioner mean?

Accepted Answer

Safety Symbols

The DAITSU ASD 18U manual uses two main symbols for safety warnings:

Forbidden Action Symbol (o/) - Indicates a prohibited action (Never do this)
Mandatory Action Symbol (o.) - Indicates a mandatory action (Always do this)

The mentions WARNING alert to the possibility of death or serious injury, while PRECAUTIONS signal risks of injury or damage.

Indicators and Display Panel

Your air conditioner has several indicator lights:

Operation Indicator - Blinks once per second when powered on, then stays on continuously during operation
TIMER Indicator - Lights up when the timer is activated
PRE-DEF Indicator - Indicates automatic defrosting (reversible models only)
AUTO Indicator - Blinks in automatic mode
ECON Indicator - Lights up in economy mode

Remote Control Displays and Indicators

The transmission light turns on when sending signals. The LCD screen displays:

The operating mode (heating, cooling, etc.)
The set temperature (17-30 degrees Celsius)
The time and timer
The fan speed (Auto, Low, Med, High)

These symbols and indicators allow you to check the status and settings of your air conditioner at a glance.

Question 2

Why is the DAITSU ASD 18U air conditioner not cooling?

Accepted Answer

If your DAITSU ASD 18U air conditioner is not producing cold air, here are the checks to perform in order:

Check the selected mode - Make sure you are in "Cooling" mode via the LCD remote control, and not in Fan, Dry, or Auto mode depending on the season.
Check the programmed temperature - The thermostat must be set between 17°C and 30°C. If the ambient temperature is already below the requested threshold, the unit will not cool.
Clean the air filter - A dirty filter significantly reduces cooling efficiency. According to the manual, the washable filter should be cleaned every two weeks. Remove it and rinse it with warm water.
Check the power supply - Ensure that the unit is plugged into a 220-240V ~ 50Hz outlet and that the outlet is functioning properly.
Wait after restarting - If you have just restarted the unit (especially after a heating cycle), wait about 3 minutes before the compressor starts again.
Check that the unit starts - Listen for the compressor to start and check if air is coming out of the outlet. If nothing happens, refer to the "Unit not starting" section of the troubleshooting guide provided in the manual.

If after these checks the air conditioner still does not produce cold air, a fault in the compressor or refrigeration circuit may be the cause and would require technical intervention.

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