Vanguard Managed Solutions MBDV41, MBDV37 Troubleshooting, Observed Problem Possible Cause

Page 31

OWNER’S MANUAL

TROUBLESHOOTING

Note: For additional help, visit DESA International’s technical service web site at www.desatech.com.

Note: All troubleshooting items are listed in order of operation.

WARNING: Turn off heater and let cool before servicing. Only a qualified service person should service and repair heater.

CAUTION: Never use a wire, needle, or similar object to clean pilot. This can damage pilot unit.

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

When ignitor button is pressed, there is no spark at pilot

1.Ignitor electrode not connected to igni- tor cable

2.Ignitor cable pinched or wet

3.Piezo ignitor nut is loose

4.Broken ignitor cable

5.Bad piezo ignitor

6.Ignitor electrode broken

7.Ignitor electrode positioned wrong

1.Reconnect ignitor cable

2.Free ignitor cable if pinched by any metal or tubing. Keep ignitor cable dry

3.Tighten nut holding piezo ignitor. Nut is located behind the mounting bracket

4.Replace ignitor cable

5.Replace piezo ignitor

6.Replace pilot assembly

7.Replace pilot assembly

When ignitor button is pressed, there is spark at pilot but no ignition

1.Gas supply turned off or equipment shutoff valve closed

2.Gas control knob not in PILOT position

3.Gas control knob not pressed in while in PILOT position

4.Air in gas lines when installed

5.Depleted gas supply (propane/LP mod- els only)

6.Pilot is clogged

7.Gas regulator setting is not correct

1.Turn on gas supply or open equipment shutoff valve

2.Turn gas control knob to PILOT position

3.Press in gas control knob while in PILOT position

4.Continue holding down control knob. Repeat igniting operation until air is removed

5.Contact local propane/LP gas company

6.Clean pilot (see Cleaning and Maintenance, page 28) or replace pilot assembly

7.Replace gas control

Pilot lights but flame goes out when control knob is released

1.Gas control knob not fully pressed in

2.Gas control knob not pressed in long enough

3.Equipment shutoff valve not fully open

4.Pilot flame not touching thermocouple, which allows thermocouple to cool, causing pilot flame to go out. This prob- lem could be caused by one or both of the following:

A)Low gas pressure

B)Dirty or partially clogged pilot

5.Thermocouple connection loose at con- trol valve

6.Thermocouple damaged

7.Control valve damaged

1.Press in gas control knob fully

2.After pilot lights, keep gas control knob pressed in 30 seconds

3.Fully open equipment shutoff valve

4.A) Contact local gas company

B)Clean pilot (see Cleaning and Maintenance, page 28) or replace pilot assembly

5.Hand tighten until snug, then tighten 1/4 turn more

6.Replace thermocouple

7.Replace control valve

www.desatech.com

Continued

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Contents MBDV37 and MBDV41 OWNER’S Operation and Installation ManualFor Your Safety Check Local Codes Prior to InstallationSafety Information Product Identification Product FeaturesLocal Codes Glossary TermsFraming and Finishing PRE-INSTALLATION PreparationClearances Location and Space RequirementsLocation of Vent Termination PRE-INSTALLATION Preparation General VentingGeneral Venting Installation Precautions Venting InstallationInstallation Planning Installing Vent System in a Chase Installation for Horizontal TerminationVent Opening Requirements Horizontal Venting Horizontal Termination ConfigurationsVenting with Two 90 Elbows Connect a section of pipe and extend up through the hole Installation for Vertical TerminationFlat Ceiling Installation Cathedral Ceiling InstallationVenting with One 90 Elbow Vertical Termination ConfigurationsVertical Venting Vertical Rigid Venting Configuration Using Two 90 ElbowsVanguard Flexible Venting High Altitude InstallationParts Lists for Venting Kits and Components Vanguard Rigid VentingNumber Description Available from Desa International Fireplace InstallationElectrical Hookup for Blower Accessory Check GAS TypeOpen lower louver panel or remove for easier access Blower Assembly and OperationInstalling GA3700 Blower Some Models Have Blower Assembly PreinstalledWireless HAND-HELD Remote Control Ghrc Series Installation Wall Switch InstallationInstalling Receiver Installation Items Needed Installing GAS Piping to Fireplace LocationPressure Testing Gas Supply Piping System Connecting Fireplace to GAS SupplyGAS Supply Testing Installation Items NeededClose equipment shutoff valve see Fig- ure Pressure Testing Fireplace Gas ConnectionsRemoving/Replacing Glass Door REMOVING/REPLACING Glass DoorTighten all bracket screws Installing Optional Brick Liner D8037A/D8041Replace glass door see Fireplace Models MBDV37 and MBDV41 Installing LOGS, Lava Rock and Glowing EmbersOperating Guidelines and Maintenance Instructions Lighting To Turn OFF GAS To Appliance For Your Safety Read Before LightingManual Lighting Procedure Operating FireplaceOperating Blower Pilot AssemblyInspecting Burners Remote OperationLogs Cleaning and MaintenanceGlass Door Pilot and BurnersMain Burner Orifice and Pilot Orifice Before YOU BeginFinal Preparation GAS Control Valve ConversionObserved Problem Possible Cause TroubleshootingOrifice Trying to light the fireplaceParts, Pilot’s millivoltageGlass soots Flame impingement on logs Delayed ignition burner Manifold pressure is too lowBurner is lit Pane/LP or natural gas companyAbove Gas leak. See Warning statementSpecifications Replacement Parts Wiring DiagramTechnical Service Service HintsMBDV37 MBDV41 Illustrated Parts BreakdownDIRECT-VENT Fireplace MBDV37 MBDV41 Parts ListBrass Louver KIT AccessoriesWall Mount ON/OFF Switch KIT GWMS2 Cleaning KIT GCK106497 Warranty Information
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