LG LCG3091ST - 30" Gas Cooktop User manual

Gas Cooktop
SERVICE MANUAL
MODEL: LCG3091ST
LCG3691ST
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL62725601
July, 2009
Printed in Korea
삼흥
정판
Website: http://biz.lgservice.com
Internal Use Only

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CONTENTS ----------------------------------------------------------------------------------------------------------------------- 2-3
SAFETY PRECAUTIONS
---------------------------------------------------------------------------------------------------- 4-9
SPECIFICATIONS
--------------------------------------------------------------------------------------------------------------- 10
INSTALLATION INSTRUCTIONS
-------------------------------------------------------------------------------------- 11-17
• BEFORE YOU BEGIN -------------------------------------------------------------------------------------------------- 11
• UNPACKING THE COOKTOP ---------------------------------------------------------------------------------------- 11
• DIMENSIONS AND CLEARANCES ------------------------------------------------------------------------------------------ 12
• INSTALLING THE COOKTOP UNIT ----------------------------------------------------------------------------------------- 13
• PROVIDE ADEQUATE GAS SUPPLY --------------------------------------------------------------------------------------
14
• CONNECT THE COOKTOP TO GAS
---------------------------------------------------------------------------------------
14
• ELECTRICAL CONNECTIONS
------------------------------------------------------------------------------------------------
15
• SEAL THE OPENINGS
----------------------------------------------------------------------------------------------------------- 15
• ASSEMBLE THE SURFACE BURNERS ----------------------------------------------------------------------------------- 16
• CHECK IGNITION OF SURFACE BURNERS ---------------------------------------------------------------------------- 16
• ADJUST THE SURFACE BURNER LOW FLAME (SIMMER) SETTING ----------------------------------------- 17
OPERATING INSTRUCTIONS ------------------------------------------------------------------------------------------- 18-20
• USING THE GAS SURFACE BURNERS
------------------------------------------------------------------------------ 18-19
• USING THE GRIDDLE ----------------------------------------------------------------------------------------------------------- 20
CARE AND CLEANING OF THE COOKTOP ---------------------------------------------------------------------- 21-24
• CARE AND CLEANING ---------------------------------------------------------------------------------------------------------- 21
• BURNER CAPS AND HEADS
-------------------------------------------------------------------------------------------------- 22
• BURNER GRATES
---------------------------------------------------------------------------------------------------------------- 23
• COOKTOP SURFACE ------------------------------------------------------------------------------------------------------------ 23
• STAINLESS STEEL SURFACES ---------------------------------------------------------------------------------------------- 24
• CONTROL KNOBS ----------------------------------------------------------------------------------------------------------------- 24
WIRING DIAGRAM -------------------------------------------------------------------------------------------------------------- 25
COMPONENT LOCATIONS
--------------------------------------------------------------------------------------------- 26-27
CONTENTS
LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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COMPONENT REPLACEMENT ----------------------------------------------------------------------------------------- 28-42
• Cooktop Plate ------------------------------------------------------------------------------------------------------------------------- 28
• Single Burner Body ------------------------------------------------------------------------------------------------------------------ 29
• Double Burner Body ---------------------------------------------------------------------------------------------------------------- 30
• Electrode Assembly(Spark Plug) ----------------------------------------------------------------------------------------------- 31
• Spark Module(I.G. Trans) ------------------------------------------------------------------------------------------------------- 32
• LED Lamp Module ----------------------------------------------------------------------------------------------------------------- 33
• Ignition Switch Assembly --------------------------------------------------------------------------------------------------------- 34
• Single Burner Valve ---------------------------------------------------------------------------------------------------------------- 35
• Double Burner Valve Assembly -------------------------------------------------------------------------------------------------- 36
• Burner Pipe Assembly -------------------------------------------------------------------------------------------------------------- 37
• Manifold Pipe Assembly ------------------------------------------------------------------------------------------------------------ 38
• Manifold Assembly ------------------------------------------------------------------------------------------------------------------ 39
• Inlet Pipe Assembly
----------------------------------------------------------------------------------------------------------------- 40
• Center Burner Bracket -------------------------------------------------------------------------------------------------------------- 41
• Side Burner Bracket(Left and Right)
------------------------------------------------------------------------------------------- 42
CONVERSION TO LP GAS ---------------------------------------------------------------------------------------------- 43-46
FAILURE MODE FLOW CHART
--------------------------------------------------------------------------------------- 47-50
TROUBLE SHOOTING
--------------------------------------------------------------------------------------------------------- 51
EXPLODED VIEW
---------------------------------------------------------------------------------------------------------------- 52
REPLACEMENT PARTS LIST
------------------------------------------------------------------------------------------- 53-56
LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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FORWARD
This LG Service Manual, “30 inch & 36 inch Gas Cooktop,” provides the technician with
information on the operation and service of the Gas Cooktop. It is to be used as a training
Service Manual. For specific information on the model being serviced, refer to the “Owner’s
Manual” or “Tech Sheet” provided with the Gas Cooktop.
SAFETY PRECAUTIONS
• Repairs of the appliance should be carried out by a authorized service technician only.
Incorrect repairs may result in dangerous situations. If you need repairs, contact an LG
Service Center or your dealer.
• Electrical leads and cables should not be allowed to touch the cooktop.
• Rating plate is located on the bottom side of cooktop.
• The power supply of the appliance should be turned off when it is being repaired.
WARNING:If the information in this manual is not followed exactly, a fire or explosion may
result causing property damage, personal injury or death.
- DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch.
• Do not use any phone in the building.
• Immediately call the gas supplier from a neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach the gas supplier, call the fire department.
- Installaton and service must be performed by a qualified installer, service agency or the
gas supplier.
WARNING: To avoid risk of severe personal injury or death, disconnect power before
working/servicing on the appliance to avoid electrical shock.
WARNING: For your safety, the information in this manual must be followed to minimize
the risk of fire, electric shock, or to prevent property damage, personal injury,
or death.
WARNING:
• Replace all parts before operating.
• RECONNECT all grounding devices.
- Failure to do so can result in severe personal injury death or electrical shock.
LG Electronics assumes no responsibility for any repairs made on our products by anyone
other than Authorized Service Technicians.
SAFETY PRECAUTIONS
LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of
California to publish a list of substances known to the state to cause birth defects or other
reproductive harm and requires businesses to warn customers of potential exposure to such
substances.
SAFETY PRECAUTIONS
• Proper Installation: Be sure your appliance is properly installed and grounded by a
qualified technician in accordance with the National Electrical Code ANSI/NFPA No. 70,
latest edition in the United States, and all local code requirements. Install only per
installation instructions.
• Do not attempt to repair or replace any part of your cooktop unless it is specifically
recommended in this manual. All other service should be referred to a qualified technician.
• Remove all tape and packaging wrap before using the appliance. Destroy the carton and
plastic bags after unpacking the appliance. Never allow children to play with packaging
material.
• The safety aspects of this appliance comply with accepted technical standards.
• Know how to disconnect the electrical power to the appliance at the circuit breaker or
fuse box in case of an emergency. Mark the breaker or fuse for ease of identification and
swift action if necessary.
• Do not repair or replace any part of the appliance. All servicing should be done only by
a qualified technician to avoid the risk of personal injury and damage to the appliance.
• Never modify or alter the construction of an appliance such as removal of panels,
wire covers or any other permanent part of the product.
• Storage on appliance: Flammable materials should not be stored near or on the
cooking surface. This includes paper, plastic and cloth items, such as cookbooks,
plasticware and towels, as well as flammable liquids. Do not store explosives, such as
aerosol cans, on or near the appliance. Flammable materials may explode and result in fire
or property damage.
• Do not leave children alone. Children should not be left alone or unattended in the
area where an appliance is in use. They should never be allowed to sit or stand on any
part of the appliance.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
CAUTION: Items of interest to children should not be stored in cabinets above a cooktop
or on the backsplash of a cooktop—children climbing on the cooktop to reach
items could be seriously injured.
WARNING: Never use your appliance for warming or heating a room.
LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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SAFETY PRECAUTIONS (cont.)
• Wear proper apparel. Loose-fitting or hanging garments should never be worn while
using the appliance. Do not let clothing or other flammable materials contact hot surfaces.
• Do not use water or flour on grease fires. Smother the fire with a pan lid, or use baking
soda, a dry chemical or foam-type extinguisher.
• When heating fat or grease, watch it closely. Fat or grease may catch fire if allowed to
become too hot.
• Use only dry pot holders. Moist or damp pot holders on hot surfaces may result in burns
from steam. Do not let the pot holders touch hot surface units. Do not use a towel or other
bulky cloth instead of a pot holder.
• Do not heat unopened food containers. Buildup of pressure may cause the container to
burst and result in injury.
CAUTION: DO NOT touch burners or grates after use.
DO NOT allow clothing or other flammable materials to touch burner areas
until they have had sufficient time to cool.
ELECTRICAL SAFETY
WARNING: If the supply cord is damaged, it must be replaced by the manufacturer, its
service agent or similarly qualified persons in order to avoid a hazard.
• The installation and connection of the new appliance must only be carried out by qualified
personnel.
CHILD SAFETY
WARNING: • This appliance is not intended for use by young children or infirm persons
unless they have been adequately supervised by a responsible person to
ensure that they can use the appliance safely.
• Young children should be supervised to ensure that they do not play with
the appliance.
• Accessible parts may become hot during use. Young children should be
kept away.
SAFETY DURING USE
• This appliance may only be used for normal cooking and frying in the home. It is not
designed for commercial or industrial purposes.
• Do not use the cooktop to heat the room.
• Take care when plugging in electric appliances near the cooktop. Cords must not
come into contact with the hot surface. This could cause damage to the cooktop and cable
insulation.
SAFETY PRECAUTIONS
LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

-7-
SAFETY DURING USE (cont.)
• Overheated fats and oils catch fire quickly. You should supervise cooking when
preparing foods in fat or oil.
• Turn off all burners after use.
• Never place combustible items on the cooktop.
• Never keep any combustible items or aerosol cans in a drawer located under the
cooktop.
• Do not use a wok on the surface burners if the wok has a round metal ring that is
placed over the burner grate to support the wok. This ring acts as a heat trap, which
may damage the burner grate and burner head. Also, it may cause the burner to work
improperly. This may cause a carbon monoxide level above that allowed by current
standards, resulting in a health hazard.
• Clean the appliance regularly to keep all parts free of grease that could catch fire.
Exhaust fan ventilation hoods and grease filters should be kept clean. Do not allow grease
to accumulate on hood or filter. Greasy deposits in the fan could catch fire. Refer to hood
manufacturer's instructions for cleaning.
• Use Proper Pan Sizes. Do not use pans that are unstable or easily tipped. Select
cookware having flat bottoms large enough to cover burner grates. To avoid spillovers, make
sure cookware is large enough to contain the food properly. This will both save cleaning
time and prevent hazardous accumulations of food, since heavy spattering or spillovers left
on range can ignite. Use pans with handles that can be easily grasped and remain cool.
• NEVER let the flames extend up the sides of the cookware for safe handling of
cookware. Flames larger than the bottom of the cookware will not result in faster heating of
the cookware and could be hazardous.
• Do not place any object on or near the gas knob control area.
• Do not let pot holders come in contact with open flame when lifting cookware off
burners.
• Do not use a towel or other bulky cloth in place of a pot holder.
• Always the turn knob to the “LITE” the position when igniting the top burners and
make sure the burners have ignited.
• Glazed cooking utensils: Only certain types of glass, glass/ceramic, ceramic,
earthenware, or other glazed utensils are suitable for cooktop service without
breaking due to the sudden change in temperature. Check the manufacturer’s
recommendations for cooktop use.
• Ventilating hood: The ventilating hood above your cooking surface should be
cleaned frequently, so the grease from cooking vapors does not accumulate on the
hood or filter.
SAFETY PRECAUTIONS
LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

-8-
SAFETY DURING USE (cont.)
• Do not flame foods on the cooktop. If you do flame foods under the hood, turn the fan on.
• Do not lift the cooktop. Lifting the cooktop can cause damage and improper
operation of the cooktop.
• If the cooktop is located near a window, do not hang long curtains that could blow
over the surface burners and catch on fire.
• If you smell gas, turn off the gas to the cooktop and call a qualified service
technician. Never use an open flame to locate a leak.
• Never leave surface units unattended at high flame settings. Boilover causes smoking
and greasy spillovers that may ignite.
• Smother fire or flame in a pan with a lid or cookie sheet. NEVER pick up or move a flaming
pan.
• Do not use water on grease fires. Use baking soda a dry chemical or foam-type
extinguisher to smother fire or flame.
• To prevent burns, always be sure that the controls for all burners are at the “OFF”
position and all grates are cool before attempting to remove them.
• Always the turn knob to the “OFF” position before removing cookware.
SAFETY WHEN CLEANING
• Always switch off the appliance before cleaning.
• For safety reasons, do not clean the appliance with a steam jet or high-pressure
washer.
• Clean the cooktop in accordance with the maintenance and cleaning instructions in
owners manual.
• Do not use a steel wool pad; it will scratch the surface.
• To clean the stainless steel surface, use warm soapy water or a stainless steel
cleaner or polish. Always wipe the surface in the direction of the grain. Follow the cleaner
instructions for cleaning the stainless steel surface.
HOW TO AVOID DAMAGE TO THE APPLIANCE
• Do not operate the burners with empty pots or pans.
• Do not turn on the burners with no pots or pans on the grates.
• Be very cautious if removing or replacing the grates or burner parts. Moving these can
cause scratches on the cooktop.
• Do not use cookware with any dirt build up on the bottom.
CAUTION: Burn Hazard: The burners can remain hot after use. Allow time for the
burners to cool before handling them.
SAFETY PRECAUTIONS
LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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DISPOSAL OF OLD APPLIANCES
To protect the environment, it is important that worn-out appliances are disposed of in the
correct manner.
• The appliance must not be disposed of with household rubbish.
• You can obtain information about collection dates or public refuse disposal sites from your
local health council or environmental health office.
CAUTION: Before disposing of old appliances please make them inoperable so they
cannot be a source of danger.
READ AND FOLLOW THIS SAFETY INFORMATION CAREFULLY.
SAVE THESE INSTRUCTIONS
SAFETY PRECAUTIONS
LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

SPECIFICATIONS
ITEM DESCRIPTION
MODEL
Power Requirement
The Number of Grates
Knob type
Heating Element
Design
Burners
Left Front
Left Rear
Right Front
Right Rear
Center
Cook top Dimensions
(without Grates)
Countertop Cutout Dimensions
Shipping Weight
LCG3091ST
120 Vac, 60Hz.
3 pcs
Blue Back Light
Gas(Natural / LP)
Stainless Steel Cooktop
Natural / LP [BTU/HR]
9100 / 9100
9100 / 9100
12000 / 9500
5000 / 5000
19000 / 15000
30”(762mm) x 2111/16”(550mm)
x 41/8”(104mm)
281/2”(724mm) x 1911/16”(500mm)
57.54lb(26.1kg)
LCG3691ST
120 Vac, 60Hz.
3 pcs
Blue Back Light
Gas(Natural / LP)
Stainless Steel Cooktop
Natural / LP [BTU/HR]
9100 / 9100
9100 / 9100
12000 / 9500
5000 / 5000
19000 / 15000
36”(914.4mm) x 2111/16”(550mm) x
41/8”(104mm)
3315/16”(862mm) x 1911/16”(500mm)
61.29lb(27.8kg)
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LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes