50
20306748
MLDV Series Gas Fireplace
TROUBLESHOOTING
STANDING PILOT IGNITION MILLIVOLT SYSTEM
SYMPTOM
POSSIBLE CAUSE
ACTION
1. Spark ignitor will not light
pilot after repeated trigger-
ing of piezo.
A. Wire disconnected.
B. Defective ignitor.
C. No gas or low gas pres-
sure.
D. No Propane/LPG in tank
A. Open door and check to make sure wire is con-
nected to ignitor.
B. Check for spark at electrode and pilot. If no spark
and electrode wire is properly connected, replace
pilot assembly.
C. Check remote/manual shut off valve from
fi
re-
place. Low pressure can be caused by bent lines,
restricted lines, low pressure line pressure. Consult
with plumber or gas supplier.
D. Check Propane/LPG tank. Re
fi
ll tank.
2. Pilot will not stay lit after
carefully following lighting
instructions.
A. Defective thermocouple
B. Defective valve
A. Check that thermocouple
fl
ame impinges on ther-
mocouple. Clean and/or adjust pilot for maximum
fl
ame impingement. Ensure that the thermocouple
connection at the gas valve is fully inserted and
tight.
Disconnect the thermocouple from the valve, place
one millivolt lead wire on the tip of the thermocouple
and the other meter lead wire on the thermocouple
copper lead. Start the pilot and hold the valve knob
in. If the millivolt reading is less than 15 mV, replace
pilot assembly.
B. If thermocouple is producing more than 15 mV,
replace faulty valve.
3. Pilot burning, valve knob
turned to “ON”, switch
is turned to “ON” or
“RS,” but burner will not
ignite.
A. Defective switch, wall
switch, remote control
or wire
B. Pilot
fl
ame too small
C. Defective or malfunc-
tioning thermopile
D. Defective valve
A. Check switch and wire for proper connection. Place
jumper wires across terminals of switch. If burner
comes on, replace defective switch.If the switch is
OK, repeat the same procedure on remote control
If burner comes on, replace remote control.
Place jumper wire across wire at gas valves (termi-
nals marked TH and TP/TH). If burner comes on,
wires are faulty or connections are bad. Replace
wire.
B. If pilot
fl
ame is not close enough to the thermopile,
adjust pilot
fl
ame.
C. Check thermopile wire connections to make sure all
are tight and that the thermopile is fully inserted into
pilot assembly. Check thermopile with a millivolt
meter. Connect leads to TP and TP/TH terminals
on the control valve. If meter reading is below 325
mV, replace pilot assembly.
D. Turn valve knob to “On” and switch to “ON.” Take
a reading at the thermopile leads (TP & TP/TH) on
the valve. If the meter reads greater than 175 mV
and the burner does not light, replace defective
valve.
4. Frequent pilot outage prob-
lem.
A. Pilot
fl
ame may be too
high or too low, caus-
ing pilot safety to drop
out
A. Clean and adjust the pilot
fl
ame for maximum
fl
ame
impingement on thermocouple.