Troubleshooting Guide - Millivolt - Superior Merit SLDVT-30NM Care And Operation Instructions Manual

SUPERIOR
TROUBLESHOOTING GUIDE: MILLIVOLT GAS CONTROL SYSTEM
Note: Before troubleshooting the gas control system, make sure the external gas shut off valve (located at gas supply inlet) is in the
"ON" position.
Note: Valve system troubleshooting should only be performed by a qualified service technician.
SYMPTOM
1. Spark igniter will A. Defective igniter
not light pilot after (no spark at electrode).
repeated triggering
B. Defective or misaligned
of igniter button.
electrode at pilot (spark at
electrode).
WARNING: if the
pilot will not light
after 1 minute of
attempting, wait for
C. Gas supply pressure
at least 5 minutes for
errant.
gas to clear before
D. Pilot orifice plugged.
attempting again.
2. Pilot will not stay A. Defective pilot generator
lit after carefully (thermocouple).
following the lighting
instructions.
3. Pilot burning, no A. Wall switch or wires
gas to burner, Valve defective.
knob "ON," and the
(standard) burner
OFF/ON switch is
B. Thermopile may not be
"ON."
generating sufficient
millivolts.
NOTE: If an optional*
remote switch is
C. Plugged burner orifice.
used for burner
D. OFF/ON Switch and
operation, if the
*Remote Switch are in the
standard burner
"ON" position resulting in
OFF/ON switch is
excessive resistance.
still installed on
appliance it must be
in the "OFF" position.
4. Frequent pilot/burner A. Pilot flame may be too low
outage problem. or blowing (high) causing
the pilot/valve safety to
drop out.
* Optional remote switch kits—wall switch, wall thermostat or remote control.
DIRECT-VENT GAS FIREPLACES • MODELS SLDVT-30/35/40/45 • CARE AND OPERATION INSTRUCTIONS
®
POSSIBLE CAUSES
Check for spark at electrode and pilot; if no spark and electrode wire is properly
connected, replace igniter.
Using a match, light pilot. If pilot lights, turn off pilot and trigger the igniter button
again. If pilot lights, an improper gas mixture caused the bad lighting and a longer
purge period is recommended. If pilot will not light – check gap at electrode and
pilot – should be 1/8" to have a strong spark. If gap measures 1/8", replace pilot (see
Figure 14 on Page 16).
Check inlet gas pressure. It should be within the limits as marked on the rating plate.
Clean or replace pilot orifice.
Check pilot flame, it must impinge on thermocouple (see Figure 14 on Page 16).
Clean and/or adjust pilot for maximum flame impingement on thermocouple. Ensure
that the connection between the valve and thermocouple are tight and secure.
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.
Check thermopile with millivolt meter. Take reading at thermopile terminals of gas
valve. Should read 325 millivolts minimum with optional wall switch "OFF." Replace
faulty thermopile if reading is below specified minimum.
Check burner orifice for blockage and remove.
When turning on the burner using a *remote switch, ensure that the standard OFF/ON
switch is in the "OFF" position. If both switches are in the ON position, it may result in
excessive resistance (and millivolt drainage) and the burner may not come on.
Clean and/or adjust pilot flame for maximum flame impingement on thermocouple
(see Figure 14 on Page 16).
CORRECTIVE ACTION
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