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• To check current remote control transmission code.

- Press for more than 10 seconds.

• To change the air quality sensor sensitivity:

- Press and release with pointer.
- Press the Timer Decrement button to select sensitivity:

1. Low Sensitivity
2. Standard (Default)
3. Hi Sensitivity

- Confirm setting by pressing Timer Set button, a “Beep” sound will be heard. LCD returns to original display after 2 seconds.
- LCD returns to original display if remote control does not operate for 30 seconds.

• To change the remote control’s time format.

- Press for more than 5 seconds.

• To clear and restore the remote control setting to factory default.

- Press once to clear the memory.

• To change indoor unit indicator’s LED intensity.

- Press continuously for 5 seconds.

• To change remote control display from Degree Celsius (

°C) to Degree Fahrenheit (°F).

- Press continuously for 10 seconds.

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In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table to the right.

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• Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started. 

Cooling Mode

Heating Mode

Condition of the air

conditioner

Low Pressure

High Pressure

Electric current 

during operation

Low Pressure

High Pressure

Electric current 

during operation

Insufficient refrigerant

(gas leakage)

Clogged capillary tube or

Strainer

Short circuit in the indoor unit

Heat radiation deficiency of the 

outdoor unit

Inefficient compression

Nature of fault

Symptom

• Electric current during operation becomes approximately 20% lower than the normal value.

Insufficient compressing of a compressor

• The discharge tube of the compressor becomes abnormally hot (normally 70 to 90

°C).

• The difference between high pressure and low pressure becomes almost zero.

• Electric current reaches a high level abnormally, and the value exceeds the limit of an

ammeter. In some cases, a breaker turns off. 

Locked compressor

• The compressor has a humming sound.

• Electric current during operation becomes approximately 80% lower than the normal value.

Insufficient switches of the 4-way valve

• The temperature different between from the discharge tube to the 4-way valve and from

suction

• tube to the 4-way valve becomes almost zero.

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• Cautions! When handling electronic controller, be careful of electrostatic discharge.
• Be sure to return the wiring to its original position.
• There are many high voltage components within the heat sink cover so never touch the interior during operation. Wait at least two minutes after

power has been turned off.