Vermont Casting 2951, 2950, 2998, 2997, 2996 Troubleshooting / Honeywell #8420 Gas Control System

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Vermont Castings Pinnacle & Stardance Direct Vent - Rear Vent Gas Heaters

Troubleshooting / Honeywell #8420 Gas Control System

NOTE: Before troubleshooting the gas control system, be sure the external gas shutoff is in the “ON” position.

WARNING: REMOVE THE GLASS PANEL BEFORE PERFORMING ANY GAS CONTROL SERVICE WORK.

SYMPTOM

POSSIBLE CAUSES

CORRECTIVE ACTION

 

1.

Spark ignitor will

A. Defective or misaligned

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

 

 

 

not light

electrode at the pilot

push the ignitor button again. If pilot will not light, check

 

 

 

 

 

 

gap at electrode and pilot - it should be 1/8” to have a

 

 

 

 

 

 

strong spark.

 

 

 

 

 

 

 

 

 

 

 

 

 

B. Defective ignitor (push

Push piezo ignitor button. Check for spark at electrode

 

 

 

 

 

button)

and pilot. If there is no spark at the pilot, and electrode

 

 

 

 

 

 

wire is properly connected, replace ignitor.

 

 

 

 

 

 

 

 

 

 

2.

Pilot will not stay lit

A. Defective pilot generator

Check pilot flame. It must impinge on the thermocouple

 

 

 

after carefully

(thermocouple)

or thermopile. NOTE: This pilot burner assembly uses

 

 

 

following the

 

both a thermocouple and a thermopile. The thermo-

 

 

 

lighting instructions

 

couple operates the pilot flame. Tighten the thermo-

 

 

 

 

 

 

couple. The thermopile operates the main valve (ON and

 

 

 

 

 

 

OFF). Clean and/or adjust pilot for maximum flame

 

 

 

 

 

 

impingement on thermocouple and thermopile.

 

 

 

 

 

 

 

 

 

 

 

 

 

B. Defective automatic valve

Turn valve knob to ‘Pilot’. Maintain flow to pilot; millivolt

 

 

 

 

 

operator

meter should read greater than 10mV. 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.

 

 

 

 

 

 

 

 

 

 

 

 

 

A. Remote switch or wires

Check rocker switch and wires for proper connection.

 

 

3.

Pilot lights, no gas

defective

Use jumper wires across terminals at rocker switch. If

 

 

 

to burner, valve

 

burner lights, replace rocker switch. If okay, use jumper

 

 

 

knob ON, remote

 

wires across rocker switch wires at the valve; if burner

 

 

 

switch (rocker

 

lights, wires are faulty or connections are bad.

 

 

 

switch) ON

 

 

 

 

 

 

B. Thermopile may not gener-

1. Be sure wire connections from thermopile at gas valve

 

 

 

 

 

 

 

 

 

 

ate sufficient voltage

terminals are tight and thermopile is fully inserted into

 

 

 

 

 

 

pilot bracket.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

Remove rocker switch wires from valve terminals. If

 

 

 

 

 

 

burner now stays lit, trace rocker switch wiring from

 

 

 

 

 

 

ground. It may be grounded to the appliance or the

 

 

 

 

 

 

gas supply line.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3. Check the thermopile with a millivolt meter. Take

 

 

 

 

 

 

reading at thermopile (“TP” and “TP/TH”) terminals of

 

 

 

 

gas valve. Should read 325 millivolts minimum while

 

 

 

 

holding valve knob depressed in PILOT position and

 

 

 

 

with rocker 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 knob to ON, place rocker switch to ON, millivolt

 

 

 

operator

meter should read greater than 10 mV. If the reading is

 

 

 

 

okay and the burner does not light, replace the valve.

 

 

 

 

 

 

4. Frequent pilot

A. Pilot flame may be too low

Clean and/or adjust pilot flame for maximum flame

 

outage

or high, (blowing or lifting),

impingement on thermocouple and thermopile.

 

 

 

causing the pilot to drop out

 

 

 

 

 

 

 

B. Possible blockage of the

Check the vent terminal for blockage.

 

 

 

vent terminal

 

 

 

 

 

 

 

 

 

 

 

 

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Contents Pinnacle & Stardance Direct Vent, Rear Vent Gas Heater Table of Contents Installation & Operating Instructions Stove Dimensions Stardance Direct Vent Gas Heater Stove Dimensions Pinnacle Direct Vent Gas HeaterMinimum Clearances to Combustible Materials Clearance RequirementsInput Model Fuel Gas Control BTU/h Gas SpecificationsMantel Clearances Hearth Requirements Gas Inlet and Manifold PressuresHorizontal Termination High ElevationsVent Termination Clearances Vertical TerminationLocation of Vent Termination General Venting Information Termination Location Canadian Installations US InstallationsTermination Clearances Vent Components Firebox Preparation Assembly ProceduresParts Bag Contents Tool/Materials RequiredFasten the left side to the rear shroud Heater Shell AssemblyInstall Optional Fan Kit #2960/FK28 Install the FireboxFan Kit Contents Rear Vent Venting System Assembly Direct Vent General InformationVent Opening -Noncombustible Wall Through Side Wall Vent Termination Below GradeInstall inner starter pipe and inner elbow Vent Opening Noncombustible Wall Side Wall Termination Assembly400mm below the base of the snorkel. Install a ³⁄₈ x 9³⁄₈ 240mm x 240mm Vertical Through the Roof Vent AssemblyFireplace Vent Termination Clearances Vertical Through Existing ChimneyFireplace Installation Requirements PDV20 Fireplace Installation Requirements Sdvr Burner Information Complete the AssemblyInstall ON/OFF Switch R Models only Connect the Gas Supply LineUse only a thermostat rated for 500 750 millivolts Install the Front and Top PlatesThis completes assembly of the PDV20 and Sdvr stove Thermostat ConnectionModels 2950 Install the Log SetLogs Models 2995, 2996, 2997Your First Fire Flame & Temperature AdjustmentFlame Characteristics OperationCorrect pilot flame pattern. PSE Pilot To Turn Off Gas To Heater Lighting And Operating InstructionsWhat to do if YOU Smell GAS Symptom Possible Causes Corrective Action Troubleshooting / Honeywell #8420 Gas Control SystemDelay Timer Mode Shut Off ProcedureTransmitter Operation Off Mode On Manual ModeDisable Thermostat Function Auto ModeFan Override During Auto Mode Change Between F/C Temperature UnitsLocal Path Fuel Conversion Instructions Conversion PrecautionsConversion Procedure Auto PathPilot Type Models 2995, 2996 R Models OnlyConversion to LP Input BTU/h Models 2997, 2998 RF Models OnlyAll Models Conversion to Natural Gas Input BTU/hMaintenance Inspect the Vent System Annually Gasket ReplacementCheck the Gas Flame Regularly Wiring Diagrams Stove Disassembly5a,b6 PDV20 Sdvr Description 2950Shell Enamel Part Numbers Sdvr Color Fuel Conversion KitsShell Enamel Part Numbers PDV20 Color Left End Right End Front Control DoorScreen Kit Optional AccessoriesRemote Controls Fan KitsIf Warranty Service is NEEDED… Product Covered by this WarrantyVermont Castings, Majestic Products

2950, 2995, 2998, 2996, 2997 specifications

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