Troubleshooting; Items To Be Checked First - Samsung AS18A9RCF Service Manual

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Troubleshooting

1 Items to be checked first

1) The input voltage should be voltage rating within ±10% range.
The air conditioner may not operate properly if the voltage is out of this range.
2) Is the connection cable linking the indoor unit and the outdoor unit properly?
The indoor unit and the outdoor unit shall be linked by six cables.
Check the terminals if the indoor unit and outdoor unit are properly linked by the same number of cables.
Otherwise the air conditioner may not operate properly.
3) When a problem occurs due to the contents illustrated in the table below, it is not a symptom related
to the malfunction of the air conditioner.
No. Operation of air conditioner
1 The STD operation indicator, LED blinks when a
power plug of the indoor unit is plugged in at first.
In the Cool mode, the compressor does not operate
2
at a room temperature higher than the setting
temperature while the indoor fan operates.
The Fan speed operating is not allowed in the Auto
3
or Dry mode.
4 Compressor stops operating intermittently in the Dry
mode.
The compressor stops intermittently in the Cool or
5
Dry mode, and the fan speed of the indoor unit
decreases.
4) Indoor unit observes operation condition of the air conditioner and displays self diagnosis on the
display panel.
NO.
STD LED blinking (1Hz)
1
TIMER LED blinking (1Hz)
2
3 STD and TIMER LED blinking (1Hz)
BIO LED blinking (1Hz)
4
5 STD, BIO and TIMER LED blinking(1Hz)
6 All LED blinking(1Hz)
Display
Restore from power failure (input initial power)
Indoor unit Room sensor Error (open or short)
Indoor unit heat exchanger temperature sensor Error (open or short)
Indoor fan malfunctioning (for spead is below 450rpm)
EEPROM Error
Option Error (Option error wasn't setup or option data error)
Explanation
It indicates power is on. The LED stops blinking if the
operation On/Off button on the remote control is pushed.
It happens after three minutes when the compressor is
reoperated. The same phenomenon occurs when a power
is on. As a phenomenon that the compressor is
reoperated after three minutes, the indoor fan is adjusted
automatically with reference to a temperature of the air.
The speed of the indoor fan is set to LL in the Dry mode.
The Fan speed is five steps are selected automatically in
the Auto mode.
The compressor is controlled automatically in the Dry
mode depending on the room temperature and humidity.
The compressor stops intermittently or the fan speed of the
indoor unit decreases to prevent inside/outside air from
freezing depending on the inside/outside air temperature.
Self Diagnosis
15