LG LWC1262ACG_N_P / LWC1262PCG_N_P / LWC1262BCG_N_P / LWC1262QCG_N_P / LWC1262AHG_E / LWC1262PHG_E Service Manual ▷ View online
—28—
Possible Trouble 4
FAN does not operate.
• Check the PCB pattern.
• Exchange IC1.
• Exchange IC7.
Is the voltage NO.2 or 3
of IC7 DC 5V?
Is the voltage NO.14 or 15
of IC7 0V?
• Check the RY-High or
RY-Low.
• Check the wiring diagram.
NO
NO
YES
YES
Is the voltage of Battery
about over 2•3V?
• Exchange Receiver Ass'y.
Is the connection of
CN-DISP2 all right?
Is the voltage No.7
of CN-DISP2 on Main PCB
Ass'y DC 5V?
• Exchange the battery.
• Check the PCB pattern.
• Connect connector to
CN-DISP2 exactly.
CN-DISP2 exactly.
NO
NO
NO
YES
YES
YES
Possible Trouble 5
Remote controller does not operate.
—29—
NO
NO
NO
NO
YES
YES
YES
Is the IC6 all right?
Is the connection of
CN-DISP1 all right?
• Exchange the display
PCB Ass'y.
PCB Ass'y.
• Exchange IC6.
• Exchange TR1,
TR2, TR3.
TR2, TR3.
• Connect connector
to CN-DISP1 exactly.
to CN-DISP1 exactly.
Does the TR1,
TR2, TR3 operate normally
on main PCB Ass'y?
NO
NO
YES
YES
Is the Knob of SW1
set to left position?
Is the voltage No.3 of
CN-DISP2 of Main PCB
Ass'y DC 5V?
• Reference to
OWNER'S MANUAL.
OWNER'S MANUAL.
• Set the Knob of SW1
to left position.
to left position.
• Check the SW1.
• Check the pattern of
Main & Display PCB.
• Check the pattern of
Main & Display PCB.
Possible Trouble 6
It displays abnormally on display PCB Ass'y.
Possible Trouble 7
The function of Auto Restart does not operate.
—30—
ROOM AIR CONDITIONER VOLTAGE LIMITS
Check voltage at outlet. Correct if none.
Check voltage to rotary switch. If none, check
power supply cord. Replace cord if circuit is open.
Check switch continuity. Refer to wiring diagram
for terminal identification. Replace switch if
defective.
Connect wire. Refer to wiring diagram for terminal
identification. Repair or replace loose terminal.
Test capacitor.
Replace if not within ±10% of manufacturer's
rating. Replace if shorted, open, or damaged.
Fan blade hitting shroud or blower wheel hitting
scroll. Realign assembly.
Units using slinger ring for condenser fan must
have
1
/
4
to
5
/
16
inch clearance to the base. If it hits
the base, shim up the bottom of the fan
motor with mounting screw(s).
Check fan motor bearings; if motor shaft will not
rotate, replace the motor.
Check voltage. If not within limits, call an
electrician.
Test capacitor.
Check bearings. Does the fan blade rotate freely?
If not, replace fan motor.
Pay attention to any change from high speed to
low speed. If the speed does not change, replace
the motor.
No power
Power supply cord
Rotary switch
Wire disconnected or
connection loose
Capacitor (Discharge
capacitor before testing.)
Will not rotate
Revolves on overload.
Fan motor will not run.
Fan motor runs
intermittently
COMPLAINT
CAUSE
REMEDY
—31—
COMPLAINT
CAUSE
REMEDY
If cracked, out of balance, or partially missing,
replace it.
replace it.
If cracked, out of balance, or partially missing,
replace it.
replace it.
Tighten it.
If knocking sounds continue when running or
loose, replace the motor. If the motor hums or
noise appears to be internal while running,
replace motor.
loose, replace the motor. If the motor hums or
noise appears to be internal while running,
replace motor.
Check voltage. See the limits on the preceeding
page. If not within limits, call an electrician.
page. If not within limits, call an electrician.
Check the wire connections, if loose, repair or
replace the terminal. If wires are off, refer to wiring
diagram for identification, and replace. Check wire
locations. If not per wiring diagram, correct.
replace the terminal. If wires are off, refer to wiring
diagram for identification, and replace. Check wire
locations. If not per wiring diagram, correct.
Check for continuity, refer to the wiring diagram
for terminal identification. Replace the switch if
circuit is open.
for terminal identification. Replace the switch if
circuit is open.
Check the position of knob If not at the coldest
setting, advance the knob to this setting and
restart unit.
Check continuity of the thermostat. Replace
thermostat if circuit is open.
setting, advance the knob to this setting and
restart unit.
Check continuity of the thermostat. Replace
thermostat if circuit is open.
Check the capacitor.
Replace if not within ±10% of manufacturers
rating. Replace if shorted, open, or damaged.
Replace if not within ±10% of manufacturers
rating. Replace if shorted, open, or damaged.
Check the compressor for open circuit or ground.
If open or grounded, replace the compressor.
If open or grounded, replace the compressor.
Check the compressor overload, if externally
mounted. Replace if open. (If the compressor
temperature is high, remove the overload, cool it,
and retest.)
mounted. Replace if open. (If the compressor
temperature is high, remove the overload, cool it,
and retest.)
Check the voltage.
If not within limits, call an electrician.
If not within limits, call an electrician.
Check overload, if externally mounted.
Replace if open. (If the compressor temperature
is high, remove the overload, cool, and retest.)
Replace if open. (If the compressor temperature
is high, remove the overload, cool, and retest.)
Check the system for a restriction.
Fan
Blower
Loose clamper
Worn bearings
Voltage
Wiring
Rotary
Thermostat
Capacitor (Discharge
capacitor before servicing.)
capacitor before servicing.)
Compressor
Overload
Voltage
Overload
Refrigerating system
Fan motor noise.
Compressor will not run,
but fan motor runs.
but fan motor runs.
Compressor cycles on
overload.
overload.
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