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- 54 -

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.

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.)

Check DISP PWB Ass'y
- 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.

Check the connecting circuit between the remote control
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

- 55 -

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.

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).

When the sensor circuit for indoor temperature and connector are in bad
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

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)

- 56 -

Check the TRIAC high speed operation by Remote control.

(The Indoor Fan Motor is connected)

Turn off Main power

Check the connection of CN-MOTOR

Check the Fan Motor

Check the Fuse(AC250V/T2A)

Turn ON Main Power

Check the related circuit of indoor Fan Motor.

• The pin NO 58 of Micom, and the part for driving TRIAC(the input and

output signal of IC01M, PIN NO 1, 16)

• Check the pattern
• Check the TRIAC

- TRIAC Open: Indoor Fan Motor never operate
- TRIAC short: Indoor Fan Motor always operates in case of ON or OFF.

The voltage of PIN NO 1(blue) and 3(yellow) of CN-MOTOR.

About AC 180V over

About AC 50V over

TRIAC is not damaged

TRIAC Check

- 57 -

Operate “Heating Mode(     )” by setting the desired temperature of the
remote control is higher than one of the indoor temperature by 2°C at
least.

In heating Mode, the indoor fan operates in case the pipe temperature
is higher than 28°C.

Turn ON Main Power

• Confirm that the Vertical Louver is normally geared with the shaft of

Stepping Motor.

• If the regular torque is detected when rotating the Vertical Louver with

hands 

Normal

• Check the connecting condition of CN-U/D Connector
• Check the soldering condition(on PWB) of CN-U/D Connector

If there are no problems after above checks

• Confirm the assembly conditions that are catching and interfering parts

in the rotation radial of the Vertical Louver

Check the operating circuit of the Vertical Louver

• Confirm that there is DC +12V between pin

(RED) of CN-U/D and

GND.

• Confirm that there is a soldering short at following terminals.

- Between 

, 

, 

and 

of MICOM

- Between 

,    , 

and 

of IC01M

- Between 

,    , 

and 

of IC01M

60

61

62

63

3

4

5

6

11

12

13

14