DOWNLOAD LG LM-2164H2L Service Manual ↓ Size: 6.06 MB | Pages: 100 in PDF or view online for FREE

- 60 -

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-DISPI 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 controller.
(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 
controller door is fault, it is impossible to operate 
temperature regulating(

¡ª

/

¡

) and wind speed selecting.

Check the connecting circuit between the remote con-
troller MICOM (No. 

§

) - R17(2

Ω

) - IR LED - Q1 -

R16(2.2K

Ω

).

Check point

• Check the connecting circuit between PIN 

¤Ł

-

R01L(1K) - C01L(680PF) - MICOM PIN

• Check Receiver Ass'y

- 61 -

Turn on Main Power

Operate "Cooling Mode(     )" by setting the desired temperature of the
remote controller 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), R01H(1.0K), R04H(6.2K),

R03H(1.0K) (Indoor unit).

• Check the indoor temperature sensor is disconnected or not(About 10k

Ω

/ at 25°C).

Check Outdoor Unit

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

Below DC 1V

About DC12V

(app)

Between two pin of DC
part in relay for COMP

- 62 -

Check the SSR high speed operation by remote control.

(The Indoor Fan Motor is connected)

Turn off Main power

Check the connection of CN-FAN or 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 of Micom, and the part for driving SSR
• Check the pattern
• Check the SSR

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

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

About AC 180V over

About AC 50V over

SSR is not damaged

SSR Check

- 63 -

• 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.