Monessen Hearth TPB18 Installation And Operating Instructions Manual page 35

If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and
the heater may backfi re when lit. If the gas quality or pressure is low, contact your local
gas supplier immediately.
OBSERVED PROBLEM POSSIBLE CAUSE
ODS/pilot lights, but flame
goes out when control knob
is released.
Burner does not light after
ODS/pilot is lit.
Burner backfires during
combustion
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.
70D0004
1. Control knob not fully pressed in.
2. 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, causing
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 burner orifices.
1. LP-regulator shut down due to inlet pressure
too high.
TROUBLESHOOTING
REMEDY
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.
6. Replace thermocouple.
7. Replace control valve.
1. Burner orifice is clogged.
2. Burner orifice diameter is too small.
3. Inlet gas pressure is too low.
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.
2. Log heater is intended to be smokeless. Turn
OFF heater and call qualified service 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.
35