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DOWNLOAD LG LT-B2421CL / LT-B2421HL / LT-B2461CL / LT-B2461HL / LT-B2821CL / LT-B2821HL / LT-B2861CL / LT-B2861HL / LT-B3021CL / LT-B3021HL / LT-B3621CL / LT-B3621HL / LT-B3661CL / LT-B3661HL / LT-B3681CL / LT-B3681HL Service Manual ↓ Size: 2.16 MB | Pages: 86 in PDF or view online for FREE

Model
LT-B2421CL LT-B2421HL LT-B2461CL LT-B2461HL LT-B2821CL LT-B2821HL LT-B2861CL LT-B2861HL LT-B3021CL LT-B3021HL LT-B3621CL LT-B3621HL LT-B3661CL LT-B3661HL LT-B3681CL LT-B3681HL
Pages
86
Size
2.16 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
lt-b2861hl.zip
Date
PREV: LG LT-B2860HL Service Manual

LG LT-B2421CL / LT-B2421HL / LT-B2461CL / LT-B2461HL / LT-B2821CL / LT-B2821HL / LT-B2861CL / LT-B2861HL / LT-B3021CL / LT-B3021HL / LT-B3621CL / LT-B3621HL / LT-B3661CL / LT-B3661HL / LT-B3681CL / LT-B3681HL Service Manual ▷ View online

Electronic Parts Troubleshooting Guide
: The unit does not operate.
Possible Trouble 1
–42–
YES
YES
YES
NO
YES
Is the input voltage
of transformer AC220V?
Is the input voltage
of IC01D DC14V?
Check the FUSE
and the wiring diagram.
Is the output voltage 
of IC01D DC12V?
Is the PIN 31,32 of
MICOM. DC5V?
Exchange MICOM. 
YES
NO
Check the main P.C.B
pattern.
NO
NO
Check the D02D~D05D.
NO
YES
Exchange 
the transformer.
Is shorted the
transformer output?
NO
YES
Is the output voltage 
of IC02D DC5V?
NO
Exchange IC01D.
Exchange IC02D.
Is the output voltage
of transformer about AC14V?
Check the 
5V P.C.B pattern.
Possible Trouble 2
: The indoor fan does not operate.
–43–
NO
NO
Is it the HOT
START mode?
Is IC01M operated
normally?
Check the fan motor
and connector.
(CN-MOTOR)
YES
Is the each Relay
any problem?
YES
NO
YES
It is normal operation.
Exchange IC01M.
Exchange Relay.
–44–
Possible Trouble 3
: Auto Air direction louver does not operate.
Possible Trouble 4
: Wired remote controller does not operate.
YES
NO
YES
Is IC01M operated
normally?
Is the PIN 10 of
CN-AC2 DC12V?
Check the step motor
and connector. 
(CN-AC2, AC1)
Check the main P.C.B
DC12V pattern.
NO
Exchange IC01M.
NO
YES
YES
YES
Is the LCD operated
normally?
Is the terminal of wired
Remocon T2 DC12V?
Is the pin 31, 32 of
Micom DC 5V?
Change the wired Remocon.
Check the wired Remocon 
PCB and DC 12V pattern.
NO
NO
Check the parts of 
communication.
Connector CN-Remo, and 
terminals of wired 
Remocon exactly.
–45–
Possible Trouble 5
: Ineffective Heating
YES
YES
NO
YES
Is it Heating Mode?
Does the temperature 
set all right?
Change IC01M.
NO
NO
Adjust operation mode.
Adjust set temperature.
Is IC01M operated 
normally?
YES
Check the connector.
(CN-OUT, CN-AC1.2)
Check RY-4Way.
NO
Is 4way-valve operated?
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