Monessen Hearth DLY18 Installation And Operating Instructions Manual page 33

OBSERVED PROBLEM
Burner does not light after ODS/
pilot is lit.
Burner backfires during combus-
tion.
Slight smoke or odor during ini-
tial operation.
Logs appear to smoke after ini-
tial operation.
Heater produces a whistling noise
when burner is lit.
No gas to pilot.
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.
POSSIBLE CAUSE
4. Thermocouple connection loose at con-
trol 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.
2. Burner orifice diameter is too small.
3. Inlet gas pressure is too low.
1. Manifold pressure is too low.
2. Burner orifice is clogged.
1. Burner orifice is clogged or damaged.
2. Burner is damaged.
3. Gas regulator defective.
1. Vapors from paint or curing process of logs.
1. Turning control knob to HIGH position
when burner is cold.
2. Air in gas line.
3. Dirty or partially clogged burners orifice.
1. LP-regulator shut down due to inlet pres-
sure too high.
REMEDY
4. Hand tighten until snug, then tighten
1/4 turn more.
5. Contact local gas company.
6. Replace thermocouple.
7. Replace control valve.
1. Clean burner or replace burner orifice.
2. Replace burner orifice.
3. Contact qualified service person.
1. Contact local gas company.
2. Clean burner or replace burner orifice.
1. Clean burner or replace burner orifice.
2. 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.
1. Log heater is intended to be smokeless.
Turn OFF heater and call qualified ser-
vice person.
1. Turn control knob to LOW position and
let warm up for a minute.
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.
2. Replace regulator on heater.
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