Samsung MH020FVEA, Service Manual

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9-1 Samsung Electronics
1. The input voltage should be rating voltage ±10% range.
The air conditioner may not operate properly if the voltage is out of this range.
2. Is the link cable linking the indoor unit and the outdoor unit linked properly?
The indoor unit and the outdoor unit shall be linked by 4 wires.
2 wires are for power and other 2 wires are for communication, total 4 wires on each indoor unit. Check the terminals if the
indoor unit and outdoor unit are properly linked by the same number of cables and if connecting position on the terminal is
correct. Otherwise the air conditioner may not operate properly.
3. When a problem occurs due to the contents illustrated in the table below it is a symptom not related to the malfunction of the
air conditioner.
Operation of air conditioner No
1
2
3
4
5
6
7
8
9-1 Items to be checked first
9. Troubleshooting
In a COOL operation mode, the compressor does not
operate at a room temperature higher than the setting
temperature that the INDOOR FAN should operate.
In a HEAT operation mode, the compressor does not
operate at a room temperature lower than the setting
temperature that indoor fan should operate.
Fan speed setting is not allowed in AUTO( ) or
DRY( ) mode.
Compressor stops operation intermittently in
DRY( ) mode.
Compressor of the outdoor unit is operating although
it is turned off in a HEAT mode.
Timer LED( ) only of the indoor unit lights up and
the air conditioner does not operate.
The compressor and indoor fan stop intermittently in
HEAT mode.
Indoor fan and outdoor fan stop operation
intermittently in a HEAT mode.
The compressor stops intermittently in a
COOL mode or DRY mode, and fan speed of the
indoor unit decreases.
Explanation
In happens after a delay of 3 minutes when the compressor
is reoperated. The same phenomenon occurs when a power
is on.
As a phenomenon that the compressor is reoperated after a
delay of 3 minutes, the indoor fan is adjusted automatically with
reference to a temperature of the air blew
The speed of the indoor fan is set to LL in DRY mode.
Fan speed is 5 steps and is selected automatically in AUTO
mode.
Compressor operation is controlled automatically in DRY mode
depending on the room temperature and humidity.
When the unit is turned off while de-ice is activated, the
compressor continues operation for up to 12 minutes (maxi-
mum) until the deice is completed.
Timer is being activated and the unit is in ready mode.
The unit operates normally if the timer operation is cancelled.
The compressor and indoor fan stop intermittently if room
temperature exceeds a setting temperature in order to protect
the compressor from overheated air in a HEAT mode.
The compressor operates in a reverse cycle to remove
exterior ice in a HEAT mode, and indoor fan and outdoor fan
do not operate intermittently for within 20% of the total heater
operation.
The compressor stops intermittently or the fan speed of the
indoor unit decreases to prevent inside/outside air frozen
depending on the inside/outside air temperature.