Troubleshooting Gas Control (Sit 820 Millivolt Gas Valve) - Majestic DV360 Homeowner's Installation And Operating Manual

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
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.
10006357
Troubleshooting the Gas Control System
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 couple/thermopile. Note: this pilot burner
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 impingement on thermopile and thermocouple.
pilot safety to drop out.
B. Possible blockage of the
vent terminal.
DV360/580 Series Direct Vent Gas Fireplace
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 gap at electrode and pilot-
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 elec-
trode wire is properly connected, replace ignitor.
Check pilot flame. Must impinge on thermo-
assembly utilizes both-a thermocouple and a ther-
mopile. The thermocouple operates the main valve
operation (On and Off). Clean and or adjust pilot for
maximum flame impingement on thermopile and
thermocouple.
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.
Check wall switch and wires for proper connections
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.
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
Check the vent terminal for blockage (recycling the
flue gases)
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