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3030 3-90-30007498Vermont Castings • Radiance RADVT Installation Manual_R32 • 10/23
Symptom PossibleCauses Corrective Action
Spark Ignitor will not
light
1. Defective or misaligned
electrode at pilot
1. Using a match, light pilot. If pilot lights, turn o󰀨 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.
2. Defective ignitor (push
button)
2. With the control knob in the pilot position, push the control knob all the way and
hold. Check for spark at electrode and pilot. If no spark to pilot, and electrode
wire is properly connected, replace the battery in the ignitor module and try
again. Refer to Maintenance Section. If the problem still exists, replace the
ignitor module box.
Pilot will not stay
lit after carefully
following lighting
instructions
1. Defective pilot generator
(thermocouple), remote
wall switch
1. Check pilot ame. Must impinge on thermocouple/thermopile. NOTE: This
pilot burner assembly utilizes both a thermocouple and a thermopile. The
thermocouple operates the main valve operation (On and O󰀨). Clean and or
adjust pilot for maximum ame impingement on thermopile and thermocouple.
2. Defective automatic valve 2. Turn valve knob to “Pilot”. Maintain ow to pilot; millivolt 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.
Pilot burning, no
gas to main burner
1. Wall switch or wires
defective
1. Check wall switch and wires for proper connections. Jumper wire across
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.
2. Thermopile may not be
generating su󰀩cient
millivoltage
Be sure wire connections form thermopile at gas valve terminals are tight
and thermopile is fully inserted into pilot bracket.
One of the wall switch wires may be grounded. Remove wall switch wires
form valve terminals if pilot now stays lit, trace wall switch wiring for ground.
May be grounded to stove or gas supply.
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 “O󰀨”. Replace faulty
thermopile if reading is below specied minimum.
3. Plugged burner orice 3. Check burner orices for debris and remove.
4. Defective automatic valve
operator
4. Turn valve knob to “On”, place wall switch to “On” millivolt meter should read
greater than 150mV. If the reading is okay and the burner does not come on,
replace the gas valve.
Frequent pilot
outage problem
1. Pilot ame may be too low
or blowing (high) causing
the pilot safety
to drop out
1. Clean and/or adjust pilot ame for maximum ame impingement on thermopile
and thermocouple.
2. Possible blockage of the
vent terminal
2. Check the vent terminal for blockage (recycling the ue gases)
GasControlSystem(RADVTmodels)
SIT NOVA 820 Millivolt Valve
NOTE:Beforetroubleshootingthegascontrolsystem,besureexternalgasshuto󰀨isinthe“On”position.
G.Troubleshooting
30


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