Monessen Hearth DFX32C - Manual (Page 27)

33D4047 7
DFX & DBX Series Vent Free Fireplaces TROUBLESHOOTING
W
ARNING
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.
OBSERVED PROBLEM
ODS/pilot lights, but flame
goes out when control knob is
released.
Burner does not light after ODS/
pilot is lit.
Burner backfires during com-
bustion.
Slight smoke or odor during
initial operation.
Logs appear to smoke after
initial operation.
Heater produces a whistling
noise when burner is lit.
No gas to pilot.
POSSIBLE CAUSE
1. Control knob not fully pressed in.
. Control knob not pressed in long
enough.
3. Manual shutoff valve not fully open.
4. Thermocouple connection loose at control
valve.
5. Pilot flame not touching thermocouple,
which allows thermocouple to cool, caus-
ing pilot flame to go out. This problem could
be caused by either low gas pressure, or a
dirty or partially clogged ODS/pilot.
6. Thermocouple damaged.
7. Control valve damaged.
1. Burner orifice is clogged.
. Burner orifice diameter is too small.
3. Inlet gas pressure is too low.
1. Manifold pressure is too low.
. Burner orifice is clogged.
1. Burner orifice is clogged or damaged.
. Burner is damaged.
3. Gas regulator defective.
1. Vapors from paint or curing process of logs.
. Vapors or smoke continue after heater
has run with damper or window open for
several hours.
1. Turning control knob to HIGH position
when burner is cold.
. Air in gas line.
3. Dirty or partially clogged burner orifices.
1. LP-regulator shut down due to inlet pres-
sure too high.
REMEDY
1. Press in control knob fully.
. After ODS/pilot lights, keep control
knob pressed in for 30 seconds.
3. Fully open manual shutoff valve.
4. Hand tighten thermocouple connec-
tion until snug, then tighten 1/4 turn
more.
5a.Contact local gas company.
5b.Clean pilot with vacuum cleaner.
6. Replace thermocouple.
7. Replace control valve.
1. Clean orifice.
. Replace burner orifice.
3. Contact qualified service person.
1. Contact local gas company.
. Clean burner or replace burner ori-
fice.
1. Clean burner or replace burner ori-
fice.
. Replace burner.
3. Replace gas regulator.
1. Problem will stop after a few hours
of operation. Run the heater with
the damper open if you have one,
or open a window for the first few
hours.
. Log heater is intended to be smoke-
less. Turn OFF heater and call quali-
fied service person.
1. Turn control knob to LOW position
and let warm up for a minute.
. Operate burner until air is removed
from line. Have gas line checked by
local gas company.
3. Clean burner or replace burner ori-
fice.
1. Verify LP tank regulator is installed
and set at 11" to 13" w.c.
. Replace regulator on heater.