Monessen Hearth Double Door VFCS20DNV Installation And Operating Instructions Manual page 30

TROUBLESHOOTING
If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and
the heater may backfire when lit. If the gas quality or pressure is low, contact your
local gas supplier immediately.
SYMPTOM POSSIBLE CAUSE
ODS/pilot
1. Control knob not fully pressed
lights, but in.
flame goes out
2. Control knob not pressed in
when con-
long enough.
trol knob is
3. Appliance shutoff valve not
released.
fully open.
4. Thermocouple connection loose
at control valve.
5. Pilot flame not touching ther-
mocouple, which allows ther-
mocouple to cool, causing pilot
flame to go out.
6. Thermocouple damaged.
Burner does
1. Inlet gas pressure is too low.
not light after
2. Burner orifice diameter is too
ODS/pilot is
small.
lit.
3. Burner orifice is clogged.
Burner back-
1. Manifold pressure is too low.
fires during
2. Burner orifice is clogged.
combustion.
Slight smoke 1. Burner orifice is clogged or
or odor during
damaged.
initial opera-
2. Burner is damaged.
tion.
3. Gas regulator defective.
Logs appear
1. Vapors from paint or curing process
to smoke after of logs.
initial opera-
tion.
H e a t e r p ro -
1. Vapors from paint or curing process
duces a whis-
of logs.
t l i n g n o i s e
2. Air in gas line.
when burner
is lit.
3. Dirty or partially clogged burner
orifices.
No gas to pilot. 1. LP-regulator shut down due to
inlet pressure too high.
30
ACTION
1. Press in control knob fully.
2. After ODS/pilot lights, keep control knob pressed in for 30 seconds.
3. Fully open manual shutoff valve.
4. Hand tighten thermocouple connection until snug, then tighten 1/4 turn
more.
5. Contact local gas company. This problem could be caused by either low gas
pressure, or a dirty or partially clogged ODS/pilot.
6. Replace pilot.
1. Contact qualified service person.
2. Replace burner orifice.
3. Burner orifice is clogged.
1. Contact local gas company.
2. Clean burner or replace burner orifice.
2. Replace burner.
2. Replace burner.
3. Replace gas regulator.
1. Problem will stop after a few hours of operation. Open a window for the first
few hours.
2. Log heater is intended to be smokeless. Turn OFF heater and call qualified
service person.
1. Problem will stop after a few hours of operation. Open a window for the first
few hours.
2. Operate burner until air is removed from line. Have gas line checked by local
gas company.
3. Clean burner or replace burner orifice.
1. Verify LP tank regulator is installed and set at 11" to 13" w.c.
58D6002