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- 51 -
Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air and operating current.
Temp. Difference
Temp. difference : approx. 0°C
Current : less than 80% of
Current : less than 80% of
rated current
Temp. difference : approx. 8°C
Current : less than 80% of
Current : less than 80% of
rated current
Temp. difference : less than 8°C
Current : over the reated
Current : over the reated
current
Temp. difference : over 8°C
Operating Current
• All amount of refrigerant leaked
out. Check refrigeration cycle.
• Refrigerant leakege
Clog of refrigeration cycle
Defective compressor
Defective compressor
• Excessive amount of refrigerant
• Normal
Notice :
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower tem-
perature difference is larger.
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower tem-
perature difference is larger.
2. Check temperature and pressure of refrigeration cycle.
Notice :
1. The suction pressure is usually 4.5~6.0 kg/cm
1. The suction pressure is usually 4.5~6.0 kg/cm
2
G(Cooling) at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
Suction pressure
Temperature
(Compared with
(Compared with
Cause of Trouble
Description
the normal value)
the normal valve)
Defective compressor
Current is low.
Defective 4-way reverse valve
Excessive amount of
High pressure does not quickly
Normal
refrigerant
rise at the beginning of
operation.
operation.
Insufficient amount of
Current is low.
Lower Higher
refrigerant
(Leakage)
Clogging
Current is low.
High
Higher
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Electronic Parts Troubleshooting Guide
1. Product does not operate at all.
(* Refer to Electronic Control Device drawing and Schematic diagram.)
Turn off Main Power
Turn on Main Power
Does "beeping" sound is made from the Indoor Unit?
Primarily, the operating condition of Micom is OK.
Check the voltage of power(About AC 220V/AC240V, 50Hz)
• Main power's voltage
• Voltage applied to the unit
• Connecting method of Indoor/Outdoor connecting
• Voltage applied to the unit
• Connecting method of Indoor/Outdoor connecting
cable
• Check PWB Ass'y
- Fuse
- Pattern damage
- Varistor(ZNR01J)
- Pattern damage
- Varistor(ZNR01J)
Check the connection housing for contacting
• Connector related to CN-TAB1, RY-COMP No. 3 PIN
• Connector related to CN-MOTOR
• Connector contacting of Outdoor Fan/Compressor
• Display PWB Ass'y Check
• Connector related to CN-MOTOR
• Connector contacting of Outdoor Fan/Compressor
• Display PWB Ass'y Check
Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor) and contacting
condition of related connector
Compressor, Stepping Motor) and contacting
condition of related connector
PCB Board Operation Check
Items
• Power Transformer
(Outdoor unit)
- Input Voltage
- Output Voltage
- Input Voltage
- Output Voltage
• IC01D(7812) Output
(Indoor/Outdoor unit)
• IC02D(7805) Output
(Indoor/Outdoor unit)
• IC01A(KIA7036, Reset IC)
X01(8MHz)
• Replace Trans
• Replace IC01D
• Replace IC02D
• Replace faulty parts
- About AC220V/240V±10% - Check the power voltage
- About AC14±3V
- About AC14±3V
• DC +12V
• DC +5V
• Voltage of Micom 10,
(DC +4.5V over) and Soldering condition.
Content
Remedy
NO
YES
(After 10 seconds)
- 53 -
2. The product is not operate with the remote control.
Turn on Main Power
While the compressor has been stopped, the compressor does not
operate owing to the delaying function for 3 minutes after stopped.
Caused by other parts except the remote control
Cause by the remote control
When the mark( ) is displayed in LCD screen, replace
battery.
battery.
Check the contact of CN-DISP1 connector.
When the compressor stopped Indoor Fan is driven by a low speed.
At this point the wind speed is not controlled by the remote control.
(When operated in the Sleeping Mode, the wind speed is set to the
low speed by force.)
At this point the wind speed is not controlled by the remote control.
(When operated in the Sleeping Mode, the wind speed is set to the
low speed by force.)
Check DISP PWB Ass'y
- Voltage between CN DISP1
- Voltage between CN DISP1
-
: DC +5V
When the detect switch(double key) inside the remote
control door is fault, it is impossible to operate
temperature regulating( / ) and wind speed selecting.
control door is fault, it is impossible to operate
temperature regulating( / ) and wind speed selecting.
Check the connecting circuit between the remote control
MICOM (No. ) - R17(2
MICOM (No. ) - R17(2
Ω
) - IR LED - Q1 - R16(2.2K
Ω
).
Check point
• Check the connecting circuit between PIN
-
R02L 1k
Ω
- Cø1L(680PF) - MICOM PIN No. 43
• Check Receiver Ass'y
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3. Compressor/Outdoor Fan are unable to drive.
Turn on Main Power
Operate "Cooling Mode( )" by setting the desired temperature of the
remote control is less than one of the indoor temperature by 1°C at least.
remote control is less than one of the indoor temperature by 1°C at least.
When in Air Circulation Mode, Compressor/Outdoor Fan is stopped.
Check the sensor for indoor temperature is attached as close as to be
effected by the temperature of Heat Exchanger(EVA).
effected by the temperature of Heat Exchanger(EVA).
When the sensor circuit for indoor temperature and connector are in bad
connection or are not engaged, Compressor/Outdoor Fan is stopped.
connection or are not engaged, Compressor/Outdoor Fan is stopped.
• Check the related circuit of R02H(12.1K), R04H(6.2K), Micom (No.26, 27)
(Indoor unit).
• Check the indoor temperature sensor is disconnected or not(About 10k
Ω
/ at 25°C).
Turn off Main Power
• Check the electrical wiring diagram of outdoor side.
• Check the abnormal condition for the component of
• Check the abnormal condition for the component of
Compressor/Outdoor Fan Motor.
• Check the "open" or "short" of conmecting wires between indoor and
outdoor.
Check Relay(RY - COMP) for driving compressor.
• When the power(About AC220V/240V) is applied to the connecting wire
terminal support transferred to compressor, PWB Ass'y is normal.
• Check the circuit related to the relay.
Check point
COMP ON
COMP OFF
Between Micom(No.
DC5V
DC0V
59) and GND
Between IC01M(No. 15)
Below DC 1V
About DC12V
and GND
(app)
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