Vermont Casting s Gas Fireplace Troubleshooting Guide: Control Valve Issues and Solutions

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Vermont Castings, Majestic Products LHE Natural Vent Insert

Troubleshooting the Gas Control System

SIT NOVA 820 Millivolt Valve

NOTE: Before trouble shooting the gas control system, be sure external gas shut off is in the “On” position.

WARNING: Before doing any gas control service work, remove glass front.

SYMPTOM

POSSIBLE CAUSES

CORRECTIVE ACTION

1. Spark ignitor will not light

A. Defective or misaligned

Using a match, light pilot. If pilot lights, turn off

 

 

electrode at pilot.

pilot and push the red button again. If pilot will not

 

 

 

light - check gap at electrode and pilot-should be

 

 

 

1/8" to have a strong spark.

 

 

 

 

 

 

B. Defective ignitor (Push Button)

Push Piezo Ignitor Button. Check for spark at

 

 

 

electrode and pilot. If no spark to pilot, and elec

 

 

 

trode wire is properly connected, replace ignitor.

 

 

 

2. Pilot will not stay lit after

A. Defective pilot generator

Check pilot flame. Must impinge on thermo

carefully following lighting

(thermocouple), remote wall

couple/thermopile. Note: this pilot burner assem

instructions.

switch.

bly utilizes both-a thermocouple and a thermopile.

 

 

 

The thermocouple operates the main valve

 

 

 

operation (On and Off). Clean and or adjust pilot for

 

 

 

maximum flame impingement on thermopile and

 

 

 

thermocouple.

 

 

B. Defective automatic valve

Turn valve knob to “Pilot”. Maintain flow to pilot;

 

 

 

milivolt meter should read greater than 10 mV. If

 

 

 

the reading is okay and the pilot does not stay on,

 

 

 

replace the gas valve. Note: An interrupter block

 

 

 

(not supplied) must be used to conduct this test.

 

 

 

3. Pilot burning, no gas to

A. Wall switch or wires defective

Check wall switch and wires for proper connec

main burner

 

tions. Jumper wire accross terminals at wall

 

 

 

switch, if burner comes on, replace defective wall

 

 

 

switch. If okay, jumper wires across wall switch

 

 

 

wires at valve, if burner comes on, wires are faulty

 

 

 

or connections are bad.

 

 

B. Thermopile may not be

1. Be sure wire connections from thermopile at

 

 

generating sufficient

gas valve terminals are tight and thermopile is

 

 

millivoltage.

fully inserted into pilot bracket.

 

 

 

2. One of the wall switch wires may be grounded.

 

 

 

Remove wall switch wires from valve terminals if

 

 

 

pilot now stays lit, trace wall switch wiring for

 

 

 

ground. May be grounded to fireplace or gas

 

 

 

supply.

 

 

 

3. Check thermopile with millivolt meter. Take

 

 

 

reading at thermopile terminals of gas valve.

 

 

 

Should read 250-300 millivolts (minimum 150)

 

 

 

while holding valve knob depressed in pilot

 

 

 

position and wall switch “Off”. Replace faulty

 

 

 

thermopile if reading is below specified minimum.

 

 

 

 

 

 

C. Plugged burner orifice.

Check burner orifices for debris and remove.

 

 

 

 

 

 

D. Defective automatic valve

Turn valve knob to “On”, place wall switch to “On”

 

 

operator.

millivolt meter should read greater than 100 mV. If

 

 

 

the reading is okay and the burner does not come

 

 

 

on, replace the gas valve.

 

 

 

4. Frequent pilot outage

A. Pilot flame may be too low

Clean and/or adjust pilot flame for maximum flame

problem.

or blowing (high) causing the

impingement on thermopile and thermocouple.

 

 

pilot safety to drop out.

 

 

 

 

 

 

 

B. Possible blockage of the vent

Check the vent terminal for blockage (recycling the

 

 

terminal.

flue gases)

 

 

 

 

10005360

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Contents LHEC20 LHEC30 Table of Contents Please Read the Following Carefully Installation & Operating InstructionsLocating Your Gas Fireplace Insert with Zero Clearance Kit Insert ApplicationsMinimum Fireplace Insert Opening Fireplace & Trim DimensionsAn alternate air supply is recommended with this component MantelsFraming & Finishing Zero Clearance ApplicationsPreparation Gas SpecificationsGas Line Installation Gas Inlet & Manifold PressuresFan Removal Instructions Installation of Trim Switch For RN/RP Gas ValvesGas Supply Pressures Fan KitFor left side installation, reverse switch position Venting InstallationTest Chimney Draw Common Flue InstallationsLiner Installation Draft Relief OpeningBlocked Flue Shut Off System Blocked Flue Shut Off Switch AccessCeramic Refractory Installation Access to the shut off switch from outside of the insertOperating Instructions Flame Characteristics Large Lava Rock PlacementFlame Adjustment RN/RP Models Correct burner flame appearance for LHEC30 First FiringWhat to do if YOU Smell GAS To Turn Off Gas To HeaterSymptom Possible Causes Corrective Action Troubleshooting the Gas Control SystemHoneywell Millivolt Valve Instructions for RF Comfort Control Valve Shut Off ProcedureTransmitter Operation Off Mode On Manual ModeChange Between F/C Temperature Units Delay Timer ModeAuto Mode Fan Override During Auto ModeAuto Path LED Count Service ActionLocal Path Burner and Burner Compartment MaintenanceCleaning the Standing Pilot Control System Trim CleaningLHE Series LHER20 LHEC20 LHEC30 DescriptionGlass with Gasket Optional Accessories If Warranty Service is NEEDED… Product Covered by this WarrantyVermont Castings, Majestic Products LHE Natural Vent Insert AFUE% Efficiency Ratings

LHEC30, LHEC20 specifications

Vermont Casting has long been recognized for its commitment to quality and craftsmanship in the world of home heating appliances, and their LHEC30 and LHEC20 models exemplify this dedication. Both units are highly praised for their advanced features, efficient heating capabilities, and timeless design, making them popular choices for homeowners seeking warmth and comfort.

The LHEC30 is a powerful heater, showcasing a robust construction that utilizes cast iron, known for its excellent heat retention properties. This model is designed to deliver exceptional performance while maintaining an aesthetic appeal that blends seamlessly with traditional and modern décor. With a heating capacity of up to 3,000 square feet, the LHEC30 is perfect for larger spaces. It efficiently distributes heat through a radiant heat system, ensuring an even warmth throughout the room.

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Both models feature Vermont Casting’s advanced combustion technologies, including secondary combustion, which significantly increases efficiency and reduces emissions. This feature ensures that the wood is burned more completely, resulting in less smoke and cleaner air. Additionally, an easy-to-use air control system allows users to adjust the burn rate according to their heating needs.

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