LG LM-1966C2L_M / LM-1966H2L_M / LM-2166H2L_M / LM-2065C3L_M Service Manual ▷ View online
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• 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
• 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
5. When Vertical Louver does not operate.
Check the operating circuit of the Vertical Louver
• Confirm that there is DC +12V between pin
(RED) of CN-U/D and
GND.
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6. When Heating does not operate
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.
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.
is higher than 28°C.
Check Outdoor Unit
Check the connector of intake and pipe sensor(thermistors)
• Check the related circuit of R02H(12.1K), R01H(1.0K), R04H(6.2K),
R03H(1.0K).
• Check the indoor room temperature is disconnected or not (about
10K
Ω
/at 25°C).
• Check the indoor pipe temperature is disconnected or not (about
5K
Ω
/at 25°C).
Turn ON Main Power
Check the DC voltage on the PWB ASS’Y
• The details of check are as followings
Check point
Between two pin
of DC part in relay
for COMP.
Comp ON
Below DC 1V
Comp OFF
About DC
12V
Check point
Between two pin
of DC part in relay
for 4-way.
4-Way ON
Below DC 1V
4-Way OFF
About DC 12V
• Comp Relay.
• 4-Way Relay
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PCB Board Operation Check in Outdoor
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
Content
Remedy
7. Outdoor unit does not operate at all.
8. Communication error
• The control data can be transmitted or received between indoor and outdoor unit with one signal cable.
• If the data be disturbed by any noise level, the unit will be operated incorrectly. In this case, the indoor unit
blinks the operation and operation LED on display and indoor fan, outdoor fan, COMP are not operated.
• The unit can be reoperated by On/Off control of Remocon.
Check Outdoor Unit
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/4-way.
• Check the “open” or “short” of connecting wires between indoor and
outdoor.
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19,000(4,788)
9,500(2,394) 9,500(2,394)
2.4
1.2
1.2
1Ø, 220-240V, 50Hz
Indoor
7.0
7.0
Outdoor
41
Indoor
34
1
34
1
Outdoor
55
1
1,930
1,030
1,030
8.4
4.6
4.6
9.8
9.2
9.2
Indoor
7.5
7.5
Outdoor
61
Indoor
802 x 262x 165
Outdoor
870 x 655 x 320
Indoor
7
Outdoor
63
-
710
620
O
L.C.D Wireless
Liquid
1/4"(6.35)
Gas
3/8"(9.52)
O
O
Operation
A-Unit Only
A-Unit + B-Unit
B-Unit Only
Unit
Item
Cooling Capacity
Btu/h(kcal/h)
Moisture Removal
/h
Power Source
ø, V, Hz
Air Circulation
/min
Noise Level
dB(A)
Input
W
Runnig Current
A
E.E.R.
Btu/h.w
Motor Output
W
Dimensions(W x H x D)
mm
Net. Weight
kg
Refrigerant(R-22)(at 7.5m)
g
Airflow Direction Control(Up & Down)
Remocon Type
Service Valve
Sleeping Operation
Drain Hose
1. LM-1966C2L/M
Product Specifications
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