Lennox Hearth LBV-4324EN-H, LBV-3824EN, LBV-4324MP Troubleshooting the Electronic Ignition System

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TROUBLESHOOTING THE ELECTRONIC IGNITION SYSTEM

Note: Before troubleshooting, be sure that the appliance main line gas shut-off valve, the gas control valve and the wall switch are in the “ON” position.

Important: Valve system troubleshooting should only be accomplished by a qualified service technician.

 

SYMPTOM

POSSIBLE CAUSES

CORRECTIVE ACTION

 

 

 

 

1.

Burner will not light.

A. Damper closed or

Ensure damper control lever is locked in the open position, all the way to the

 

 

Damper Switch defective.

right. If the damper control lever is locked in the open position troubleshoot

 

 

 

through Steps B., C. and D. below. If the main burner will still not light,

 

 

 

determine if the damper switch is defective and replace if necessary.

 

 

 

 

 

 

B. Faulty Valve System.

See Below.

 

 

 

 

 

 

C. Faulty limit switch.

Reset the limit switch button. If still not working, access the leads attached to

 

 

 

the limit switch and check for continuity. If no continuity, replace limit switch.

 

 

 

 

 

 

D. “OFF/ON” or wall switch

Disconnect the two black wires from the wire nuts. Test switch(s) for

 

 

defective.

continuity with a multimeter. If continuity is not indicated, switch(s) is

 

 

 

defective and must be replaced.

 

 

 

Note: Before replacing “OFF/ON” switch, be sure to check wiring for loose

 

 

 

connections or broken wires and repair as needed.

 

 

 

 

2.

Burners come “ON” but

A. Burner orifice plugged.

Check main burner orifice(s) for stoppage. Clean or replace.

 

go “OFF.”

 

 

 

B. Obstructed vent system.

Check vent system for obstructions.

 

 

 

 

 

 

START

•Turn Off Gas Supply

•Assure Valve Switch Is In ON Position

•Disconnect Control Harness

•Set Thermostat To Call For Heat

Insert A

End View Of

 

Control Harness

24 Volt Hot

Connector

24 Volt

 

 

Common

•Check For Proper Voltage At Control Harness (See Insert A). Voltage Should Be 24V Between Thermostat Or Pressure Switch

And 24V Common And 24V Hot.

2

 

YES

• Plug Control Harness Into Valve. Wait For

Internal Check Delay.

 

• Igniter Warms Up And Glows Red.

1

YES

 

 

CHECK

NO

• Line Voltage Power

• Low Voltage Transformer

 

 

• Limit Controller

 

 

• Thermostat

 

 

• Wiring

 

 

 

 

 

 

NO

• With Pilot Burner Cable Connected, Measure

 

 

Voltage At Valve HSI Element Output. 24V

 

 

 

Nominal. (See Insert B)

2

 

 

 

1

 

 

 

 

 

YES

NO

• Replace Valve.

24 Volt

Switched

Check For Damaged Or Missing Terminals In Connector

Insert B

Igniter Terminals

• Turn On Gas Supply. • Pilot Burner Lights.

YES

•Replace Igniter/Flame Rod Assembly.

YES

 

NO

• Check That Pilot Gas Is Flowing. Wait To

NO

• Replace Valve.

 

 

 

 

Assure Plot Gas Tubing Is Purged. Recycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Call For Heat If Necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

•Measure Voltage Between 24V Hot And 24V Common

Leads To Valve Control. Must Measure At Least 19.5

NO

 

• Check Transformer And

VAC With Igniter Powered (See Insert A). To Identify

 

 

 

 

 

Line Volt Supply.

Proper Lead, This Check Must Be Done With The

 

 

 

 

 

Valve Control Connected And Igniter Powered.

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

•Replace Pilot Assembly.

 

 

 

 

• Check That Pilot Flame Makes Good Contact With

 

 

NO

Pilot Burner Flame Rod.

• Main Valve Opens And Main Burner Lights.

• Check For Good Electrical Connection Through The

 

 

 

 

Pilot Tubing.

 

 

 

 

• If Both Of The Above Are Good, Replace Igniter/Flame

 

YES

 

 

Rod Assembly.

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

• System Is Okay.

 

 

 

• Cycle Thermostat Off And Back On.

 

 

 

 

 

 

 

 

 

1

Igniter Will Cycle Off And Back On Once During

2

When Measured Voltage At Connections, Use

• Main Burner Lights.

NO

 

• Replace Valve.

 

 

The 90 Second Ignition Trial. All Voltage

 

Care To Assure Terminals Are Not Damaged.

 

 

 

 

 

 

 

Measurements Must Be Taken While The Igniter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is Powered.

 

 

 

 

15

 

 

 

 

 

 

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Contents OTL Report No -F-18-05 Retain These Instructions For Future ReferenceVented GAS Appliances 504,138M REV. H 03/2007Congratulations Table of ContentsOperation and Care of Your Appliance Actuator Damper and Outside AIR ControlsMaintenance MANUALLY-RESET Blocked Flue Safety SwitchBurner Adjustments Flame Appearance and Sooting Maintenance Schedule Maintenance Task Accomplishing Person ProcedureAre HOT Adjustment Millivolt Appliance CheckoutElectronic Appliance Checkout Page Lennox Hearth Products WarrantyReplacement Parts Product Reference InformationTo Turn OFF GAS to Appliance For Your Safety Read Before LightingLighting Instructions Honeywell and SIT Millivolt GAS Valve Lighting InstructionsInstructions Dallumage Pour Fermer LE GAZ QUI Alimente L’APPAREILHoneywell Vanne GAZ Millivolt SIT Lighting Instructions Electronic What to do if YOU Smell GASTo Shut OFF Mural Instructions D’ALLUMAGE ElectronicInstructions D’ALLUMAGE Pour Éteindre L’APPAREILSymptom Possible Causes Corrective Action Troubleshooting the Millivolt GAS Control SystemTroubleshooting the Electronic Ignition System Accessory Components Description Replacement Parts List MillivoltGAS Controls Millivolt LBV-3824 LBV-4324Standard Refractorys Shown Replacement Parts MillivoltReplacement Parts List Electronic GAS Controls ElectronicQty 504,138M REV. H 03/2007 Replacement Parts Electronic

LBV-3824MN-H, LBV-4324EP, LBV-3824EN, LBV-3824EP, LBV-3824MN specifications

The Lennox Hearth series of linear gas fireplaces, including models LBV-3824MP, LBV-3824MN, LBV-4324MN-H, LBV-4324EN-H, and LBV-3824EN, represents a harmonious blend of modern design, innovative technology, and efficient heating performance. These units are designed to elevate both the aesthetics and comfort of any living space, making them an ideal choice for homeowners looking to create a warm and inviting atmosphere.

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