Troubleshooting - Monessen Hearth MDV500 Installation And Operating Instructions Manual

TROUBLESHOOTING

GENERAL TROUBLESHOOTING
SYMPTOM POSSIBLE
CAUSE
1. Glass Soots A. Flame impingement
on logs
STANDING PILOT IGNITION
SYMPTOM POSSIBLE CAUSE
1. Spark ignitor A. Wire disconnected.
will not light
B. Defective ignitor.
pilot after
repeated
C. No gas or low gas pressure.
triggering of
piezo.
D. No Propane/LPG in tank
2. Pilot will not A. Defective thermocouple
stay lit after
carefully fol-
lowing light-
ing instruc-
tions.
B. Defective valve
3. Pilot burn- A. Defective switch, wall switch,
ing, valve remote control or wire
knob turned
to "ON",
switch is
turned to
"ON" or
B. Pilot flame too small
"RS", but
C. Defective or malfunctioning
burner will
thermopile
not ignite.
D. Defective valve
4. Frequent A. Pilot flame may be too high or
pilot outage too low, causing pilot safety to
problem. drop out
5. The pilot and A. Inner vent pipe leaking exhaust
main burner gases back into system
extinguish
B. Horizontal vent improperly
while in
pitched
operation
C. Improper vent cap installation
54
ACTION
A. Install log set per the instructions
Inspect the injector and air intake area. Make sure this area does not have any
blockage from debris and clean.
Check gas supply.
ACTION
A. Open door and check to make sure wire is connected to ignitor.
B. Check for spark at electrode and pilot. If no spark and electrode wire is prop-
erly connected, replace pilot assembly.
C. Check remote/manual shut off valve from fireplace. 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. Refill tank.
A. Check that thermocouple flame impinges on thermocouple. Clean and/or
adjust pilot for maximum flame 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.
A. Check switch and wire for proper connection. Place jumper wires across ter-
minals 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 (terminals marked TH and TP/TH).
If burner comes on, wires are faulty or connections are bad. Replace wire.
B. If pilot flame is not close enough to the thermopile, adjust pilot flame.
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 mil-
livolt 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
A. Clean and adjust the pilot flame for maximum flame impingement on ther-
mocouple.
A. Check for flue product leak. Replace defective pipe section.
B. Check horizontal-venting piping is running upward 1/4" per foot. Do not
run the pipe level or downward.
C. Check for proper installation and freedom from debris or blockage
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