MHSC MJ27NR Installation And Operating Instructions Manual page 34

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.
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.
H e a t e r p r o d u c e s a
whistling noise when
burner is lit.
No gas to pilot.
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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.
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.
86D0024