Lennox Hearth L20 BF-2, L20 DVF-2 manual Troubleshooting Qualified Technicians Only, ALL Models

Page 23

TROUBLESHOOTING Qualified Technicians Only

(ALL MODELS)

PROBLEM

 

CAUSE(S)

 

SOLUTIONS

 

1) Pilot will not light, and Piezo Igniter does not

a.

Electrode wire (at Piezo Igniter) not pushed

•

Make sure connections are solid.

produce a heavy blue spark.

 

completely on.

•

Replace piezo igniter.

 

b.

Piezo igniter is defective

 

 

 

2) Pilot will not light, but Piezo Igniter produces a

a. Incorrect lighting procedure.

•

Carefully follow the lighting / operating in-

heavy blue spark.

b. No gas to appliance due to shut valves or dis-

 

structions found in the appliance of this

 

 

connected gas lines.

•

owner's manual.

 

 

 

Check for multiple gas shut-offs; check gas

 

 

 

 

supply lines.

3) Pilot will not stay lit.

a. Thermocouple is not firmly connected to control

•

Ensure thermocouple is fully inserted into pilot

 

 

valve.

•

assembly.

 

b. Pilot flame is not directed to top of thermocou-

Replace thermocouple.

 

 

ple.

 

 

 

 

c. Thermocouple is defective. Make sure connec-

 

 

 

 

 

tion is solid.

 

 

 

4) Pilot flame stays lit, but main burner will not

a.

Burner control switch (on control panel) is in

•

Position the burner control switch to "ON"; or

light.

 

"OFF" position; or thermostat (if installed) is

 

adjust the thermostat. Refer to manufacturer's

 

 

turned off or temperature setting is too low.

•

instructions for thermostat.

 

b.

Electrical wiring is damaged or poorly con-

Refer to Control and Safety Wiring Diagram

 

 

nected

•

(page 22) and check electrical connections.

 

c.

One of the following components may be de-

Refer to Control and Safety Systems Wiring

 

 

fective: burner control switch, thermostat, vent

 

Diagram (page 22). Electrically bypass com-

 

 

spill switch, or thermopile.

 

ponents one at a time and replace defective

 

 

 

 

item. See page 24 for Spill Switch trouble-

 

 

 

 

shooting.

5) Main burner stays lit for up to 10 minutes and

a.

Flue / vent is blocked; flue gas is "spilling",

•

Examine venting system for blockage. Re-

then shuts off, pilot flame remains lit.

 

which activates the safety switch and shuts

•

move any blockage.

 

 

down the appliance.

Open a window to see if the problem is cor-

 

b.

(B-Vent) The house is negatively pressurized.

 

rected. See page 24 for Spill Switch trouble-

 

 

 

 

shooting.

6) Smell of gas

a. Loose fittings may be allowing gas to leak out.

•

Check all joints for leakage: pilot assembly,

 

 

 

 

gas supply system, main burner assembly, pi-

 

 

 

 

lot and burner adjustment screws. Use a

 

 

 

 

proper leak check solution. WARNING: Never

 

 

 

 

use an open flame to check for leaks.

7) A thin coating of black soot forms on the win-

a.

Burner primary air inlet is restricted or

•

Be sure all openings (fresh air inlets) in stove

dow. NOTE: See page 20, Cleaning Glass.

 

blocked.

 

are free from dust and debris. Recheck these

 

b. Flames make contact with logs or other sur-

•

areas periodically.

 

 

faces.

Make sure ceramic logs are in their correct

 

c.

Improper venting.

•

positions.

 

 

 

Check for flue blockage, disconnected flue,

 

 

 

 

improper installation. Make appropriate cor-

 

 

 

 

rections.

8) A white coating forms on windows, logs, and /

a. Residues / impurities being burned off.

•

Follow cleaning guidelines outlined in the

or inside walls of firebox.

 

 

 

MAINTENANCE section of this manual.

9) Circulation blower makes a humming sound,

a. Impeller blades in circulation blower are dirty.

•

Disconnect electrical power to circulation

but there is no circulation air.

b. Circulation blower is defective.

 

blower, access blower and clean impeller

 

 

 

 

blades as outlined in the MAINTENANCE sec-

 

 

 

•

tion of this manual.

 

 

 

Replace blower.

REFERENCE INFORMATION FOR QUALIFIED TECHNICIAN:

Thermopile / Thermocouple Operation

♦Thermopile: Millivolt production should be a minimum of 325 MV with pilot only.

♦Thermocouple: Millivolt product-ion should be a minimum of 14 MV with pilot only.

Drop out rate

♦TP 50-60 MV

♦TP 1 1/2-2 Min. (3 max.) if longer, replace thermopile.

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Contents 775,021M Rev. C, 8/04 Freestanding Vented GAS Fired Room HeatersRetain this Manual for Future Reference Important Warnings / Cautions Table of Contents LOW High Planning Your InstallationLocal and National Code Requirements Tool / Equipment ListQuestions to ASK the Local Building Official Corner Manufactured Mobile Home RequirementsImportant Notes Rear Wall or AlcoveHorizontal Termination With 1 Offset Vertical Termination with no OffsetsVertical Termination With 2 Offsets Direct Vent System Components Model L20 DVF-2 only InstallationSV4MCK Installation Model L20 DVF-2 onlyCony For vent termination requirements, see Vent Configuration RequirementsModel L20 BF-2 only Supply Line Size Requirements Pressure TestingGAS Supply Hookup ALL Models Door Operation ALL Models Glowing Embers GAS Appliance Final Assembly ALL ModelsInstalling LOG SET Verify that the gas line has been purged of air Installation Check List ALL ModelsLighting and Shutdown Instructions ALL Models For Your Safety Read Before LightingCare and Operation Gas Control KnobsCirculation Blower Operation ALL Models BREAK-IN PeriodCombustion Chamber Relief Door Canada Parts ListPropane Conversion Procedure Propane ConversionBurner Flame Appearance Reference InformationMaintenance Pilot Flame Appearance Air Shutter AdjustmentALL Models Periodic Check of Pilot and Burner Flames Cycle unit a minimum of 2 timesModel L20 BF-2 Model L20 DVF-2 Wiring DiagramsGAS Control and Safety System Wiring Diagram ALL Models Troubleshooting Qualified Technicians OnlySpillage Test Procedure Model L20 BF-2 only Spill SwitchTroubleshooting Check List Qualified Technicians Only Item # Catalog # Description Where Used Replacement Parts Models L20BF-2 & L20 DVF-2Item # Catalog # Model Description Optional Accessories Models L20BF-2 & L20 DVF-2Top View Side View Specifications Model L20 BF-2Specifications Model L20 DVF-2 SAFETY/ Listing Label Rating Plate SAFETY/ Listing Label Rating Plate Ownership Records Service and Maintenance LOG775,021M REV. C 08/2004

L20 DVF-2, L20 BF-2 specifications

The Lennox Hearth L20 DVF-2 and L20 BF-2 are two innovative gas fireplaces that offer modern heating solutions for homes looking to combine functionality, style, and efficiency. Both models are designed with advanced technology to deliver reliable performance and aesthetics that enhance any living space.

The L20 DVF-2 is a direct vent fireplace that utilizes a sealed combustion system, allowing it to operate efficiently without drawing air from the room. This feature not only improves energy efficiency but also helps maintain indoor air quality since outside air is used for combustion. One of its standout features is the ability to provide a range of heat output options, allowing homeowners to adjust the warmth to their preference. The fireplace comes with a convenient remote control, enabling effortless operation from anywhere in the room.

The L20 BF-2, on the other hand, is a conventional vent fireplace, offering a different installation option ideal for various home designs. Similar to the DVF-2, the BF-2 model provides a wide range of heat output, ensuring comfort in chilly conditions. It features a striking design with a large viewing area, allowing for a mesmerizing flame display that serves as a focal point in any room.

Both models are equipped with Lennox's patented Powerflow technology, which optimizes heat distribution throughout the space. This technology not only enhances comfort but also ensures that energy is used efficiently. The fireplaces also feature easy-to-use controls and customizable flame height settings, giving users precise control over their heating experience.

In terms of design, the L20 DVF-2 and L20 BF-2 come in various finishes and styles, allowing them to seamlessly blend with different home aesthetics. Their sleek and contemporary appearance complements modern interiors, while still fitting into more traditional décor in subtle ways.

Overall, the Lennox Hearth L20 DVF-2 and L20 BF-2 provide effective heating solutions paired with advanced technologies and stylish designs. Whether a homeowner desires a direct vent option or a traditional vent fireplace, both models deliver energy-efficient performance, exceptional heat distribution, and a stunning flame display that can enhance the ambiance of any living space. These fireplaces are not just heating appliances; they are an investment into comfort and elegance for years to come.
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