DVRT41Direct Vent Gas Fireplace

Trouble Shooting 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)

 

 

 

 

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Vermont Casting DVRT41 manual Trouble Shooting the Gas Control System, SIT Nova 820 Millivolt Valve
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