Lennox Hearth MPD35ST-PM, MPD35ST-NM manual Troubleshooting Procedure Electronic Ignition System

Page 19

TROUBLESHOOTING PROCEDURE - ELECTRONIC IGNITION SYSTEM

START

CHECK

• Turn Off Gas Supply.

 

• Check for proper volt-

 

 

 

• Ensure Valve Switch Is In ON Position.

 

age at control harness

 

•

Line voltage power

• Disconnect Control Harness.

 

(see insert A). Voltage

NO

•

Low voltage transformer

• Set Thermostat To Call For Heat.

2

should be 24V between

 

•

Limit controller

 

thermostat or pressure

 

• Thermostat

 

 

 

 

 

 

•

Wiring

 

 

switch and 24V common

 

 

 

 

 

 

 

 

and 24V hot.

 

 

 

 

 

YES

 

 

 

Insert A

• Plug control harness into

 

valve. Wait for internal check

End View of Control Harness Connector

delay.

 

 

 

24 Volt Hot

24 Volt

 

 

 

 

 

• With pilot burner cable con-

 

 

Common

 

 

 

 

1

 

 

 

 

 

 

NO

 

nected, measure voltage at

NO

 

 

 

 

• Igniter warms up and glows

 

 

• Replace valve.

 

 

 

 

 

 

valve HSI element output. 24V

 

 

 

 

 

red.

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

nominal. (See insert B)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

24 Volt

 

 

1

YES

 

• Replace igniter/flame rod

 

 

 

 

 

 

 

 

assembly.

 

 

Switched

 

 

 

 

 

 

 

 

Check For Damaged or Missing

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

Terminals in Connector

 

 

 

NO

• Check that pilot gas is flowing. Wait

NO

 

 

 

 

• Turn on gas supply.

 

to ensure pilot gas tubing is purged.

• Replace valve.

 

 

 

 

 

 

 

 

• Pilot burner lights.

 

 

Recycle call for heat if necessary.

 

 

Insert B

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Igniter Terminals

 

 

 

 

• Measure voltage between 24V hot and

 

 

 

 

 

 

 

 

24V common leads to valve control.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Must measure at least 19.5 VAC with

NO

• Check transformer and

 

 

 

 

 

 

 

 

igniter powered (see insert A). To

line volt supply.

 

 

 

 

 

YES

 

 

identify proper lead, this check must

 

 

 

 

 

 

 

 

 

be done with the valve control con-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

nected and igniter powered.

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

•

Replace Pilot Assembly.

 

 

 

 

 

 

 

 

 

•

Check that pilot flame makes good

 

 

 

 

 

 

 

 

 

 

contact with pilot burner flame rod.

 

 

 

 

 

•

Main valve opens and main

NO

• Check for good electrical connection

 

 

 

 

 

 

burner lights.

 

 

through the pilot tubing.

 

 

 

 

 

 

 

 

 

• If both of the above are good, replace

 

 

 

 

 

 

 

 

 

 

igniter/flame rod assembly.

 

 

 

 

 

 

 

YES

 

 

 

YES

 

 

 

 

 

• System Is okay.

 

• Cycle thermostat off and back on.

 

 

1

Igniter

will cycle off

and

2

When measuring voltage

 

 

 

 

 

 

back on once during the 90

at connections, use care

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

second

ignition trial.

All

 

to ensure terminals are

 

•

Main burner lights.

 

• Replace valve.

 

voltage measurements must

 

not damaged.

 

 

 

 

 

 

 

be taken while the igniter is

 

 

 

 

 

 

 

 

 

powered.

 

 

 

 

 

 

 

 

 

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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Contents Listing Agency 875,025M REV. NC 04/2005MPD35ST-NM MPD35ST-NE MPD35ST-PM Faire la demande. Numéro de la pièce 875,025CFCongratulations Burner Orifice Sizes all models Elevation Natural Propane Burn-in PeriodManifold Gas Supply Pressure Electronic models Fuel # Fixed Orifice Sizes Sea Level to High Altitude All ModelsMillivolt Appliances ApplianceOperation and Care of Your SIT MillivoltSee Maintenance Schedule, MaintenanceSee Figure Front Glass Enclosure Panel, Removal and InstallationReference LOG SET IdentificationCA B LOG SETAgainst The Grate Placement of Glowing EmbersRead LOG Warnings on page 9 Before Proceeding Remove front glass enclosure panel from applianceFlame Appearance & Sooting Burner Adjustments Qualified Technicians onlyAir Shutter Adjustment Guidelines This appliance is not designed to burn wood. Any attempt toElectronic Pilot Assembly Warranty Replacement Parts Wiring DiagramsProduct Reference Information Accessory ComponentsLouvers Kits Clean Face Panel KitsArch Design Arch Pane SquareDoor Frame Kits Screen Heat Guard KitArch Door Kits Forced Air KitWhat to do if YOU Smell GAS To Turn OFF GAS to ApplianceClose lower control compartment door SwitchWhat to do if YOU Smell GAS Lighting InstructionsMaintenance Task Accomplishing Person Procedure Maintenance ScheduleWhile HOT Position TroubleshootingSymptom Possible Causes Corrective Action Operation, if the standard burnerTroubleshooting Procedure Electronic Ignition System 20 P/N 875,025M REV. NC 04/2005 Replacement Parts MPD35STDescription Where Used Part/Cat Qty Description Where Used

MPD35ST-NE, MPD35ST-PM, MPD35ST-NM specifications

The Lennox Hearth MPD35ST series, which includes the MPD35ST-NM, MPD35ST-PM, and MPD35ST-NE models, is designed for homeowners seeking superior heating solutions with aesthetic appeal. These multi-position direct vent gas fireplaces combine efficiency with advanced technology, ensuring that both performance and style are prioritized in any living space.

One of the standout features of the MPD35ST series is its innovative Direct Vent technology. This system draws air from the outside for combustion, eliminating the need for indoor air and thereby reducing energy consumption and improving indoor air quality. This feature not only enhances efficiency but also provides a safe and comfortable environment for your home.

The MPD35ST fireplaces come with a variety of design options to suit different decor styles. With a variety of front options, including sleek and modern designs or classic and rustic looks, homeowners can customize their fireplace to match their aesthetic preferences. The 'No Media' (NM) style offers a clean and minimalist contemporary design, while the 'Panel Media' (PM) and 'Enhanced Media' (NE) styles feature options for adding decorative media, such as pebbles or logs, that enhance the visual ambiance of the fire.

These units also incorporate advanced heating technologies, featuring high-efficiency burners that produce significant heat output with minimal energy consumption. With adjustable flame settings, users can control the intensity of the heat while enjoying the mesmerizing flicker of the flames. This flexibility allows homeowners to create a cozy environment tailored to their comfort needs.

In addition, the Lennox MPD35ST series is designed with user-friendly controls that simplify operation. Integrated remote controls allow for easy adjustment of the temperature and flame settings from the comfort of your seat. Safety is a paramount consideration; these fireplaces are equipped with built-in safety shut-off systems that ensure worry-free operation.

Furthermore, the construction of the MPD35ST series focuses on durability and longevity. Made from high-quality materials, these fireplaces are built to withstand the test of time, providing both reliable performance and an attractive focal point in any room.

In summary, the Lennox Hearth MPD35ST-NM, MPD35ST-PM, and MPD35ST-NE models epitomize modern fireplace design. With their energy-efficient technologies, customizable aesthetic options, and user-friendly features, they are an excellent choice for homeowners looking to enhance their living spaces with both comfort and style.
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