Troubleshooting The Gas Control System - Majestic fireplaces 360DVS2 Homeowner's Installation And Operating Manual

360 DVS Series Direct Vent Fireplaces

Troubleshooting the Gas Control System

NOTE: Before troubleshooting the gas control system, be sure external gas shut off is in the "On" position.
WARNING: REMOVE GLASS FRONT BEFORE DOING ANY GAS CONTROL SERVICE WORK.
SYMPTOM
1. Spark ignitor will not light
2. Pilot will not stay lit after
carefully following lighting
instructions.
3. Pilot burning, no gas to
main burner
4. Frequent pilot outage
problem.
30
SIT NOVA 820 MILLIVOLT VALVE
POSSIBLE CAUSES
A. Defective or misaligned
electrode at pilot.
B. Defective ignitor (Push Button)
A. Defective pilot generator
(thermocouple), remote wall
switch.
B. Defective automatic valve
A. Wall switch or wires defective
B. Thermopile may not be
generating sufficient
millivoltage.
C. Plugged burner orifice.
D. Defective automatic valve
operator.
A. Pilot flame may be too low
or blowing (high) causing the
pilot safety to drop out.
B. Possible blockage of the vent
terminal.
CORRECTIVE ACTION
Using a match, light pilot. If pilot lights, turn off
pilot and push the red button again. If pilot will not
light, check the gap at electrode and pilot; it should
be 1/8" to have a strong spark.
Push piezo Ignitor Button. Check for spark at
electrode and pilot. If no spark to pilot, and electode
wire is properly connected, replace ignitor.
Check pilot flame. Must impinge on thermocouple/
thermopile. NOTE: This pilot burner assembly
utilizes both a thermocouple and a thermopile.
The thermocouple operates the main valve opera-
tion (ON/ OFF). Clean and/or adjust pilot for maxi-
mum flame impingement on thermopile and thermo-
couple.
Turn valve knob to "Pilot." Maintain flow to pilot;
millivolt 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.
Check wall switch and wires for proper connections
Jumper wires across terminals at wall switch; if
burner comes on, repalce defective wall switch. If
okay, jumper wires across wall switch wires at valve;
if burner comes on, wires are faulty or connections
are bad.
1. Be sure wire connections from thermopile at
gas valve terminals are tight and thermopile is
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.
Check burner orifices for debris and remove.
Turn valve knob to "ON," place wall switch to "ON" —
millivolt meter should read greater than 100 mV. If
the reading is okay and the burner does not come
on, replace the gas valve.
Clean and/or adjust pilot flame for maximum flame
impingement on thermopile and thermocouple.
Check the vent terminal for blockage (recycling the
flue gases)
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