Majestic DVR33 Installation Instructions & Homeowner's Manual page 26

Vermont Castings, Majestic Products
TROUBLE SHOOTING THE GAS CONTROL SYSTEM
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.
26
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 sufcient
millivoltage.
C. Plugged burner orice.
D. Defective automatic valve
operator.
A. Pilot ame may be too low
or blowing (high) causing the
pilot safety to drop out.
B. Possible blockage of the vent
terminal.
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 electrode wire is properly
connected, replace ignitor.
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 Off). Clean
and or adjust pilot for maximum ame impingement on
thermopile and thermocouple.
Turn valve knob to "Pilot". Maintain ow to pilot; mil
liv olt 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 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.
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 replace 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 de-
pressed in pilot position and wall switch "Off". Replace
faulty thermopile if reading is below specied minimum
Check burner orices 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 ame for maximum ame
impingement on thermopile and thermocouple.
Check the vent terminal for blockage (recycling the ue gases)
DVR33
CORRECTIVE ACTION
10002823/0