Lennox Hearth MLDVTCD-35NE - Manual (Page 25)

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LENNOX HEARTH PRODUCTS • MERIT ® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • CARE AND OPERATION
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
1. Spark igniter will not light pilot after
repeated triggering of igniter button.
WARNING: if the pilot will not light
after 1 minute of attempting, wait
for at least 5 minutes for gas to
clear before attempting again.
A. Defective igniter
(no spark at electrode).
Check for spark at electrode and pilot; if no spark and
electrode wire is properly connected, replace igniter.
B. Defective or misaligned electrode at pilot
(spark at electrode).
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 does not measure
1/8", replace pilot (see Figures 9 or 10 on Page 15).
C. Gas supply pressure errant. Check inlet gas pressure. It should be within the limits
as marked on the rating plate.
D. Pilot orifice plugged. Clean or replace pilot orifice.
2. Pilot will not stay lit after
carefully following the lighting
instructions.
A. Defective pilot generator
(thermocouple).
Check pilot flame, it must impinge on thermocouple
(see Figures 9 or 10 on Page 15). Clean and/or
adjust pilot for maximum flame impingement on
thermocouple. Ensure that the connection between
the valve and thermocouple are tight and secure.
3. Pilot burning, no gas to burner, Valve
knob “ON,” and the (standard) burner
OFF/ON switch is “ON." Read impor-
tant note below.
IMPORTANT NOTE: If an optional
*remote switch is used for burner
operation, the unit-mounted burner
OFF/ON switch (if installed) must be
in the "OFF" position.
*Optional remote switch kits - wall
switch, wall thermostat or remote
control.
A. Wall switch or wires defective. 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.
B. Thermopile may not be generating suf-
ficient millivolts.
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.
C. Plugged burner orifice. Check burner orifice for blockage and remove.
D. OFF/ON Switch and *Remote Switch are
in the "ON" position resulting in excessive
resistance.
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.
4. Frequent pilot/burner outage prob-
lem.
A. Pilot flame may be too low or blowing (high)
causing the pilot/valve safety to drop out.
Clean and/or adjust pilot flame for maximum flame
impingement on thermocouple (see Figures 9 or 10
on Page 15).
TROUBLESHOOTING THE MILLIVOLT CONTROL SYSTEM
Note: Before troubleshooting, be sure that the appliance main line gas shut-off valve, the gas control valve and the wall
switch are in the “ON” position.
Important: Valve system troubleshooting should only be accomplished by a qualified service technician.