LG LRG30855ST Technical Service Manual
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LG LRG30855ST Technical Service Manual

Sealed burner 30" gas range
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See also: User Manual , Instruction and Installation Manual
Website http://us.lgservice.com

SEALED BURNER

30" GAS RANGE
TECHNICAL SERVICE GUIDE
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Printed in U.S.A.
MFL38056601

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  • Page 1: Sealed Burner

    Website http://us.lgservice.com SEALED BURNER 30" GAS RANGE TECHNICAL SERVICE GUIDE Printed in U.S.A. MFL38056601...
  • Page 2 LG Electronics U.S.A., Inc. Technical Service Guide Copyright © 2006 All rights reserved. This service guide may not be reproduced in whole or in part in any form without written permission from LG Electronics U.S.A., Inc.. – 2 –...

  • Page 3: Table Of Contents

    Table of Contents Bake and Broil Burner Flame Adjustments ......................32 Bake Burner and Glow-bar Igniter ..........................31 Broil Burner and Glow-bar Igniter ......................... 30 Component Locator Views ... Control Panel ........Control Panel and Touch Board . Control Panel Assembly ....Control Features .......

  • Page 4: Introduction

    Introduction • The new gas range has an electronic tactile touch- control panel for the oven. This easy-to-operate touch-control panel is user friendly and simple to understand. • The range includes many helpful features including a self-cleaning oven. • The convection baking and roasting feature provides even cooking and superior baking every time.

  • Page 5: Installation Requirements

    Installation Requirements Installation information is for reference only. A flexible metal appliance connector used to See the Installation Instructions shipped with connect the range to the gas supply line should the product for complete details and before have an I.D. of 1/2” and be 5 feet in length attempting to install the range.

  • Page 6: Warranty

    LG GAS RANGE WARRANTY– USA LG Electronics Inc. will repair or replace your product, at LG’s option, if it proves to be defective in material or workmanship under normal use, during the warranty period set forth below, effective from the date of original consumer purchase of the product.

  • Page 7: Control Features

    Control Features Features and appearance may vary between models. Convection Models - Oven Control, Clock and Timer Features stop automatically at a time you set. PROBE PAD: Touch this pad to select the probe function. WARMING DRAWER PAD: Touch this pad and then touch number pads 1–3 to use the warming BAKE PAD: Touch this pad to select the bake drawer.
  • Page 8 Features and appearance may vary between models. Non-Convection Models - Oven Control, Clock and Timer Features COOK TIME PAD: Touch this pad and then touch SELF CLEAN PAD: Touch this pad to select self- the number pads to set the amount of time you cleaning function.

  • Page 9: Oven Vent

    Oven Vent How to Set the Oven for Broiling Your oven is vented through ducts at the rear of the Your oven is not designed for open-door cooking. range. Do not block these ducts when cooking in the Place the meat or fish on the broiler grid in the oven—it is important that the flow of hot air from the broiler pan.
  • Page 10 To Set the Timer Using the Timed Baking and Roasting Features The timer does not control oven operations. The maximum setting on the timer is 9 hours and 59 Note: Foods that spoil easily—such as milk, eggs, fish, minutes. stuffings, poultry and pork—should not be allowed to sit for more than 1 hour before or after cooking.
  • Page 11 To Set a Delayed Start and Automatic Stop Using the Probe (Convection Models) The oven will turn on at the time of day you set, For many foods, internal food temperature is the best cook for a specific length of time and then turn off test for doneness.

  • Page 12: Using The Convection Oven

    To Set Oven For Cooking when Using Probe Using the Convection Oven Insert the probe into the food. The convection oven fan shuts off when the oven door is opened. DO NOT leave the door open for long Plug the probe into the outlet in the oven. Make periods of time while using convection cooking.
  • Page 13 oven will automatically convert it to the convection To Set the Oven for Convection Baking or cooking temperature. Roasting Touch the CLEAR/OFF pad when baking is Touch the CONVECTION BAKE or CONVECTION finished. ROAST pad. Note: Use pan size recommended in the recipe Some Touch the number pads to set the desired oven package instructions for frozen casseroles, main temperature.
  • Page 14 To Set the Oven for Convection Roasting Using the Timed Convection Baking and when Using the Probe (Convection Models) Roasting Features (Convection Models) The display will flash PROBE and the oven control will You will hear a fan while cooking with this feature. The signal if the probe is inserted into the outlet, and you fan will stop when the door is opened but the heat will have not set a probe temperature and touched the...
  • Page 15 To Set a Delayed Start and Automatic Stop Special Features of the Oven Control The oven will turn on at the time of day you set, Your new touch pad control has additional features cook for a specific length of time and then turn off that you may choose to use.

  • Page 16: Control Lockout

    Tones at the End of a Timed Cycle 12-Hour, 24-Hour or Clock Blackout At the end of a timed cycle, 3 short beeps will sound Your control is set to use a 12-hour clock. followed by one beep every 6 seconds until the If you would prefer to have a 24-hour military time CLEAR/OFF pad is touched.

  • Page 17: Using The Sabbath Feature

    Using the Sabbath Feature Touch the START pad and ⊃ will appear in the display. (Designed for use on the Jewish Sabbath and holidays) The Sabbath feature can be used for baking/roasting When the display shows ⊃ the oven is set in in the oven only.

  • Page 18: Using The Electric Warming Drawer

    Using the Electric Warming Drawer Self Cleaning Oven To Use the Warming Drawer: Before a Clean Cycle Touch the WARMING DRAWER pad. “Hot” and “1” For the first self-clean cycle, we recommend venting are lit on the display and “Set” begins to blink. your kitchen with an open window or using a ventilation fan or hood.
  • Page 19 After a Clean Cycle • The word LOCKED will flash and the oven control will signal if you set the clean cycle and forget to You may notice some white ash in the oven. Wipe close the oven door. it up with a damp cloth after the oven cools. •...

  • Page 20: Component Locator Views

    Component Locator Views Gas Range with Convection Fan - Front View Control Panel Assembly Oven Temperature Sensor Broil Burner Light Meat Probe Outlet Convection Fan Bake Burner Under Bottom Pan Warming Drawer Compartment Shown with warming drawer removed. Bake Burner Combi-Valve Gas Shut Off Heat Element...

  • Page 21: Maintop Burner Assembly

    Maintop Burner Assembly Burner Cap Burner Head Ignitor (Electrode) T-15 Torx Screws Burner Orifice (Continued next page) – 21 –...

  • Page 22: Control Panel

    Control Panel Spark Module Electronic Range Control (ERC) Shown in service position. Maintop Burner Compartment Ignitor Wire Bracket Burner Orifice Door Latch Assembly Gas Manifold Shown with heat shield and door latch assembly cover removed. – 22 –...

  • Page 23: Oven Door Removal

    Range Components and Replacement WARNING: Sharp edges may be exposed when Warming Drawer Removal servicing. Use caution to avoid injury. Wear Kevlar gloves or equivalent protection. To remove and replace the warming drawer: Pull the drawer out until it stops. Lift the tab on Oven Door Removal the left side and push down the tab on the right To remove the door:...
  • Page 24 Warming Drawer Element Pull the track slide out. WARNING: Before servicing the warming drawer, Lift the front of the track slide approximately power must be disconnected from the range. ½ inch, turn the track towards the middle of the range to disengage the front tab. The warming drawer must be removed to access the warming drawer element.

  • Page 25: Maintop Removal

    Remove the Phillips-head screw from the Maintop Removal bottom front under the hinge. To remove the maintop: Remove the grates, burner caps, burner heads, igniters, and the T-15 Torx screws from the cooktop. Insert a putty knife or flat-blade screwdriver under the maintop to compress clips and remove the maintop.

  • Page 26: Oven Door Hinge Removal

    Remove the two ¼-in. hex-head screws that Oven Door Hinge Removal attach the hinge to the frame. To remove the oven door hinge: Remove the range from installation (See Range Removal Remove door (See Oven Door Removal Remove warming drawer (See Warming Drawer Removal Remove side panel (See...

  • Page 27: Door Assemblies

    Remove the four ¼-in. hex-head screws from Door Assemblies the outer frame and carefully lift off the outer frame. The doors can be separated into two assemblies: (1) Outer assembly which consists of handle, vent trim, outer glass, and frame; (2) Inner assembly which consists of inner panel, gasket, glass panels, and insulation.

  • Page 28: Oven Door Switch

    Oven Light Bulb Oven Door Switch The oven door switch is located on the left side of the door frame and is accessible from the front. Caution: Before removing the switch, disconnect the electrical power to the oven at the main fuse or circuit breaker panel.

  • Page 29: Glow-Bar Igniter

    Oven Components and Replacement Glow-bar Igniter Oven Burner Ignition System The oven bake and broil burners are ignited by a WARNING: This range uses rectangular Norton glow-bar ignition system. The igniter is a Norton glow-bar igniters. They are NOT INTERCHANGE- ABLE with cylindrical Carborundum glow-bar style rectangular glow-bar.
  • Page 30 3. Remove the 2 hex-head screws that hold the glow-bar igniter to the burner. Glow-bar Igniter – 30 –...
  • Page 31 6. Remove the hex-head screw that holds the front of the burner in place. 7. Remove the 2 hex-head screws, located behind the warming drawer, that hold the burner in place and remove the burner. Note: When reinstalling the bake burner, be sure the orifice hood is inserted into the burner inlet opening.
  • Page 32 To correct any flame problems, perform the following procedures: Bake Burner 1. Remove the warming drawer (See Warming Drawer 2. Closely examine the angle of the orifice. The orifice must point straight into the burner. 3. Use a screwdriver to loosen the air shutter screw.
  • Page 33 LP and Natural Gas Information Broil Burner LP Gas Installations: If flames lift off the burner The broil burner is accessible and located in the and appear unstable, reduce the air shutter top center of the oven. openings an additional in.
  • Page 34 6. Disconnect the 3 wire connectors from the motor. 7. Remove the 6 mounting Phillips-head screws and the motor. 3. Using a -in. wrench, remove the nut from the convection fan blade by holding the blade securely and turning the nut clockwise. Note: Convection fan blade nut has left-handed threads.
  • Page 35 – 35 –...
  • Page 36 Note: When reinstalling the sensor, use a small flat-blade screwdriver to push and guide the sensor wire harness into the oven liner. IMPORTANT: When reinstalling the oven temperature sensor, the connector end must be positioned OUTSIDE the range insulation. Insulation should be allowed to close in around the oven temperature sensor lead wires thus protecting the sensor from any heat loss at the insulation opening.

  • Page 37: Control Panel

    Control Panel Assembly Carefully support and position the control Control Panel panel on the burner grates in the service position. To remove the control panel: Move the range approximately 4 inches out from it's installation. Loosen (do not remove) the two ¼-in. hex- head screws located at the top rear corners of the backguard.
  • Page 38 – 38 –...

  • Page 39: Maintop Burner Assembly

    Range Top Components and Replacement Maintop Burner Assembly Ignitor Wire Wire Inlet WARNING: Shut off gas to the range before proceeding. Each maintop burner assembly consists of the burner cap, burner head, bracket, orifice, and tube. To improve alignment and stability, the five Bracket burner brackets have been mounted to the under 5/8-in.
  • Page 40 Maintop Burner Alignment Low Flame Simmer Adjustments For proper operation of the burner, alignment of Remove the surface control knob and locate the orifice holder, orifice, and air/gas mixer tube the adjustment screw in the center of the must be correct. The alignment can be checked control valve shaft.

  • Page 41: Manifold Panel

    Remove the three ¼-in. hex-head screws from the bottom of the manifold panel. Ignitor Switch Protective Cover Pull the manifold panel straight out from the range. Caution: Ensure the valve seal and the screw seal are in place BEFORE installing the valve. Screw Seal Valve Seal –...

  • Page 42: Gas Manifold

    Ignitor Switches Gas Manifold The ignitor switches are located inside the WARNING: Shut off gas to the range before manifold panel and are attached to each maintop proceeding. burner valve. The back of each switch is molded To remove the gas manifold: to conform to the front of the burner valve and is locked in place by 2 tabs.

  • Page 43: Door Latch Assembly

    Mark and disconnect the wiring from the latch Door Latch Assembly assembly. The door latch assembly consists of a lock motor, cam and switch assembly, lock hook, and mounting plate. It will be supplied as a complete assembly. The door latch assembly is located under the main top in a recess that is concealed by a metal cover.
  • Page 44 Diagnostics and Service Information c) Remove the brass orifice spud in the chimney Conversion to LP (PROPANE) Gas of each burner using a -in. or 7-mm nut driver. 1. Convert Regulator - Regulator is located in The top burner orifices can be removed by the lower, left hand rear corner of the range as removing the burner caps and burner heads.
  • Page 45 3. Converting the oven / broil burner orifices e) To prevent leakage, make sure the orifice spuds are securely screwed into the gas supply a) Remove oven door, warming drawer and oven tubes. bottom. The oven burner orifice hood is located f) For the extra large burner (right front), the behind the warming drawer.

  • Page 46: Lock Motor And Door Latch Switch Circuit Information

    Oven Calibration Lock Motor and Door Latch Switch Circuit Information Testing has shown that this oven has the best cooking performance at a control setting of The lock motor circuit and the door latch switch 350°F (177°C) when the average center oven circuit control the locking and unlocking of the temperature is between 350°F and 390°F (177°C door.
  • Page 47 Clean Cycle and Lock Sequence: The movement of the cam has also closed lock switch 2 which signals the control that the door is Program the Clean Cycle: locked. The control then removes power from the lock motor circuit by de-energizing the lock relay. •...

  • Page 48: Service Test Mode

    Service Test Mode The sealed burner 30" gas range has a service test mode that can be utilized by the service technician in order to test certain oven components or functions. The selected components or functions will help the service technician to quickly identify failed or improper operation of the range. Caution: Testing is accomplished through built-in test procedures.

  • Page 49: Failure Codes And Component Testing

    Failure Codes and Component Testing The oven may stop operating but not give an F code on the display immediately. Generally, a fault must exist continuously for 5 minutes before an F code is recorded (F2 is sooner). F codes are stored in nonvolatile EEPROM memory until the same fault occurs twice consecutively.
  • Page 50 ERC Test Locations - Convection Model CN2 - Pin 1 - Probe 1 - Oven Light Pin 2 - GND (Ground) 2 - Line Pin 3 - Unlock (Latch Switch #1) 3 - Bake Pin 4 - Lock (Latch Switch #2) 4 - Neutral Pin 5 - Common 5 - Broil...
  • Page 51 ERC Test Locations - Non-Convection Model P101 P103 P102 1 - L1 - Line P102 - Pin 1 - Broil 2 - MDL - Lock Motor Pin 2 - Bake P101 - Pin 3 - Unlock (Latch Switch #1) Pin 3 - Common (L1) Pin 4 - Lock (Latch Switch #2) Pin 4 - Aux2 (Warming Drawer) Pin 5 - Common...
  • Page 52 Component Resistive Testing WARNING: Disconnect electrical power before servicing. Caution: Label all wires prior to disconnection. Wiring errors can cause improper and dangerous operation. Verify operation after servicing. Note: Resistance values in the following table are approximate. Test Locations Component Conditions Resistance Non-...
  • Page 53 Test Locations Component Conditions Resistance Non- Convection Convection Meat Probe CN2-1 to CN2-2 Probe plugged In - CN2 56 K Ohms disconnected from board @ room temperature CN2-1 to GND CN2 disconnected from board Open CN2-2 to GND CN2 disconnected from board 0 Ohms Surface Ignitor Switch Violet wire...
  • Page 54 Component Voltage Testing WARNING: Disconnect electrical power before servicing. Caution: Label all wires prior to disconnection. Wiring errors can cause improper and dangerous operation. Verify operation after servicing. Test Locations Component Conditions Voltage Non- Convection Convection Oven Light OL to N P103-2 to P103-1 Door closed and oven light not 120 VAC...
  • Page 55 Oven Sensor and Door Switch Test Note: See Lock Motor and Door Latch Switch Circuit Information for door switch function explanation. Remove power from oven. Locate and disconnect the wire harness from CN2 (convection model) or P101 (non-convection model) location on the ERC. Make resistance measurement from the side of the wire harness connector with exposed terminals.
  • Page 56 Warming Drawer Performance The operation of the warming element is controlled by user settings and the ERC. One of 3 warming drawer heat settings can be selected. After a pre-determined timed preheat period, cycling of the element is controlled by the ERC with a 4- minute duty cycle.

  • Page 57: Schematics And Wiring Diagrams

    Schematics and Wiring Diagrams Gas Range Schematic with Convection Fan (Continued next page) – 57 –...
  • Page 58 Gas Range Schematic Without Convection Fan (Continued next page) – 58 –...
  • Page 59 Gas Range Wiring Diagram with Convection Fan (Continued next page) – 59 –...
  • Page 60 Gas Range Wiring Diagram without Convection Fan – 60 –...
  • Page 61 #EV# 0004 0003 0011 0004 0013 0003 0237 0021 0010 0010 0020 0023 0014 0024 0025 0015 0009 0012 0016 0015 0022 0018 0012 0018 0042 0017 0269 0268 0270 0206 0005 0146 0711 0037 0118 0218 0030 0002 0008 0027 0272 0029...
  • Page 62 #EV# 0204 0106 0171 0105 0107 0104 0771 0100 0111 0108 0088 0110 0112 0770 0150 0159 0170 0114 0154 0168 0151 0151 0155 0152 0113 0156 0153 0155 0121 0115 0157 0122 0116 0169 0117...
  • Page 63 #EV# 0780 0295 0257 0299 0205 0258 0279 0256 0700 0278 0274 0273 0296 0709 0283 0247 0261 0207 0209 0250 0204 0203 0220 0262 0249 0277 0211 0043 0233 0228 0212 0287 0208 0284 0230 0248 0703 0229 0260 0275 0092 0210...
  • Page 64 #EV# 0340 0361 0318 0400 0312 0327 0317 0375 0461 0332 0366 0354 0323 0329 0338 0330 0365 0315 0323 0339 0359 0322 0314 0343 0201 0361 0312 0202 0323 0300 0200 0375 0360 0345 0365 0344 0306 0323...

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