LG LRG3091ST User manual

1
30” Freestanding Gas Range
SERVICE MANUAL
MODEL: LRG3091ST
LRG3091SB
LRG3091SW
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website http://biz.lgservice.com
P/NO : MFL63290104
August, 2010
Printed in Korea
삼흥
정판
Internal Use Only

This LG Service Manual, “ 30” Freestanding Self-Cleaning Gas Range,” provides the technician
with information on the operation and service of the Freestanding Self-Cleaning Gas Range. 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 range.
SAFETY PRECAUTIONS
• Repairs of the appliance should be carried out by a licensed technician only. Incorrect repairs
may result in dangerous situations. If you need repairs, contact an LG Service Center or your
dealer.
• If the power cord is defective, it must be replaced by a qualified service agent with a UL listed
range cord.
• Electrical leads and cables should not be allowed to touch the oven.
• Rating plate is located on the left side of warming drawer.
• The power supply of the appliance should be turned off when it is being repaired.
FORWARD
LG Electronics assumes no responsibility for any repairs made
on our products by anyone other than Authorized Service Technicians.
WARNING
• DISCONNECT power supply cord from the outlet before servicing.
• Replace all panels and parts before operating.
• RECONNECT all grounding devices.
- Failure to do so can result in severe personal injury, death or electrical shock.
• DO NOT Touch when the oven operates.
- The interior parts will be very hot.
WARNING
If the information in this manual is not followed exactly, a fire or explosion
may result causing property damage, personal injury or death. If you
smell gas:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.

(P AGE )
GENERAL -------------------------------------------------------------------------------------------- 1-1 ~ 1-5
• Important safety instructions --------------------------------------------------------------------------------------
1-1 ~ 1-3
• Model & Serial number label and tech sheet locations
-----------------------------------------------------------
1-4
• Specifications
------------------------------------------------------------------------------------------------------------------
1-5
USING YOUR RANGE ------------------------------------------------------------------------- 2-1 ~ 2-4
• General information ---------------------------------------------------------------------------------------------------------
2-1
• Control panel features
----------------------------------------------------------------------------------------------
2-2 ~ 2-4
- To turn on on the surface burners
- Setting the Clock
- Start, Clear/Off
- To turn On/Off the oven light
- Timer On/Off
- Warm(Options: Hold 3 sec) pad: (6 types of category).
- Bake, Timed Bake, Delayed timed Bake
- Broil
- Warm
- Time cook with warm
- Oven lockout
- Changing hour mode on clock (12HR, 24HR)
- Proof
- Self-Clean
COMPONENT ACCESS --------------------------------------------------------------------- 3-1 ~ 3-28
• Component Locations
----------------------------------------------------------------------------------------------- 3-1~3-2
• Removing the Back, Control cover and Key pad assembly ----------------------------------------------- 3-3~3-4
• Removing Power Control Board (PCB) and the Spark Module (IG Trans) --------------------------------- 3-5
• Removing Power Control Board (PCB) --------------------------------------------------------------------------------- 3-6
• Removing the Cooktop Plate -------------------------------------------------------------------------------------------- 3-7
• Removing the Cooktop Plate and the Spark Module -------------------------------------------------------------- 3-8
• Removing the Case assembly(Cooktop Burner assembly) ----------------------------------------------------- 3-9
• Removing the Cooktop Parts
---------------------------------------------------------------------------------- 3-10~3-13
• Removing the Door Latch and the Door Switch ------------------------------------------------------------------- 3-14
• Removing the BROIL Burner assembly ----------------------------------------------------------------------------- 3-15
• Oven Bottom, the Frame guide and the Burner assembly --------------------------------------------- 3-16~3-17
• Removing the Oven light & Socket assembly ---------------------------------------------------------------------- 3-18
• Removing the latch drive assembly ----------------------------------------------------------------------------------- 3-19
- Door locking mechanism ---------------------------------------------------------------------------------------------- 3-19
• Removing the Oven temperature Sensor --------------------------------------------------------------------------- 3-20
• Removing & Replacing the Warming drawer ----------------------------------------------------------------------- 3-21
• Removing & Replacing the Lift-off Oven Door --------------------------------------------------------------------- 3-22
• Removing the Oven Door Handle & Glass
---------------------------------------------------------------- 3-23 ~ 3-24
• Removing the Oven Door Gasket ------------------------------------------------------------------------------------- 3-25
• Removing a Side Panel --------------------------------------------------------------------------------------------------- 3-26
• Removing the Oven Valve (Safety Valve) & Gas Regulator ------------------------------------------- 3-27~3-28
TABLE OF CONTENTS

(Page)
COMPONENT TEST ----------------------------------------------------------------------------- 4-1 ~ 4-3
• Door locking Motor
--------------------------------------------------------------------------------------------------------- 4-1
• Micro Switch (normally open type)
----------------------------------------------------------------------------------- 4-2
• Oven Sensor
----------------------------------------------------------------------------------------------------------------- 4-2
• Door switch
------------------------------------------------------------------------------------------------------------------- 4-2
• Oven lamp
-------------------------------------------------------------------------------------------------------------------- 4-3
• Broil or bake igniter
-------------------------------------------------------------------------------------------------------- 4-3
• Oven (safety) valve
-------------------------------------------------------------------------------------------------------- 4-3
• Ignition switch
---------------------------------------------------------------------------------------------------------------- 4-3
CONVERSION TO LP GAS ------------------------------------------------------------------ 5-1 ~ 5-8
COMPOSITION OF CONTROL
------------------------------------------------------------- 6-1 ~ 6-4
• Main PCB ----------------------------------------------------------------------------------------------------------------------- 6-2
• Power PCB ---------------------------------------------------------------------------------------------------------------------- 6-2
• Main PCB ------------------------------------------------------------------------------------------------------------------------ 6-4
• Power PCB ---------------------------------------------------------------------------------------------------------------------- 6-4
DIAGNOSIS THROUGH SCHEMATIC ----------------------------------------------------- 7-1~7-2
CHECK THE FAILURE CODE (F-code)
--------------------------------------------------------- 8-1
FAILURE CODE SUMMARY
-------------------------------------------------------------------------- 9-1
CHECKING FLOW CHART BY FAILURE
---------------------------------------- 10-1 ~ 10-23
• No display (No power)
------------------------------------------------------------------------------------------- 10-2 ~ 10-4
• No heating (including F11 error)
----------------------------------------------------------------------------- 10-5 ~ 10-8
• Door lock system failure (including F10 error)
---------------------------------------------------------- 10-9 ~ 10-12
• Sensing fail (including F1, F2 error)
--------------------------------------------------------------------- 10-13 ~ 10-16
• Oven hot (including F6 error) ------------------------------------------------------------------------------ 10-17 ~ 10-19
• Key pad failure (including F3 error) ---------------------------------------------------------------------- 10-20 ~ 10-21
• Oven lamp does not operate ------------------------------------------------------------------------------- 10-22 ~ 10-23
TROUBLE SHOOTING --------------------------------------------------------------------- 11-1 ~ 11-4
EXPLODED VIEW
-------------------------------------------------------------------------- 12-1 ~ 12-14

1-1
GENERAL
IMPOR
IMPORT TANT SAFETY INSTRUCTIONS ANT SAFETY INSTRUCTIONS
Read and follow all instructions before using your oven to prevent the risk of fire, electric shock, injury to person, or
damage when using the range. This guide don’t cover all possible conditions that may occur. For further assistance
contact your service agent or manufacturer.
This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hunt you
and others. All safety messages will follow the safety alert symbol and either the word “WARNING”
or “CAUTION”. These word means :
This symbol will alert you to hazards or unsafe practices which could cause
serious bodily harm or death.
WARNING
This symbol will alert you to hazards or unsafe practices which could cause
bodily injury or property damage.
CAUTION
WARNING
• DO NOT step or sit on the door and install the Anti-Tip Bracket packed with range.
- The range could be tipped and injury might result from spilled hot liquid, food, or the range itself.
- If the range is pulled away from the wall for cleaning, service, or any other reason, ensure that the Anti-Tip
Device is properly reengaged when the range is pushed back against the wall.
• DISCONNECT power supply cord from the outlet before servicing.
• Replace all panels and parts before operating.
• RECONNECT all grounding devices.
- Failure to do so can result in severe personal injury, death or electrical shock.
• DO NOT touch burners, grates or interior surfaces of oven.
- Heating element may be hot even though they are off.
- Interior surfaces of an oven become hot enough to cause burns.
• During and after use, do not touch, or let clothing or other flammable materials
contact burners, grates or interior surfaces of oven until they have had sufficient
time to cool.
-Other surfaces of the appliance may become hot enough to cause burns among these surfaces are oven vent
openings and surfaces near these openings, oven doors, and windows of oven doors.
• DO NOT store items of interest to children in cabinets above a range or on the back guard of a range.
- Children climbing on the range to reach items could be seriously injured.
CAUTION
• Always use Pot Holders or oven mitts when removing food from the Warming Drawer.
- You can be burned as cookware and plates will be hot.
• Be careful when you work on the gas range handling the sheet metal part.
- Sharp edge may be present and you can cut yourself.
• Be careful not to bend the fan blade
- Failure to do so can result in vibration, noise, and poor performance of convection when operating.
• Be careful not to scratch or chip the oven liner paint when you remove the oven light socket
in the next step.
• Turn power OFF before removing the Warming Drawer.
•
Be careful when removing and lifting the door.
• DO NOT lift the door by the handle.
- Failure to do so can result in personal injury as the door is very heavy.