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UNVENTED NATURAL GAS LOG HEATER
FIREPLACE MANUFACTURERS INCORPORATED
18
105191
OBSERVED PROBLEM
Burner does not light after ODS/pilot is lit
Delayed ignition burner
Burner backfiring during combustion
Slight smoke or odor during initial operation
Heater produces a whistling noise when
burner is lit
Moisture/condensation noticed on windows
Dark residue on logs or inside of fireplace
White powder residue forming within burner
box or on adjacent walls or furniture
REMEDY
1. Contact local natural gas company
2. Clean burner (see Cleaning and Mainte-
nance, page 20) or replace burner orifice
3. Replace burner orifice
1. Contact local natural gas company
2. Clean burner (see Cleaning and Mainte-
nance, page 20) or replace burner orifice
1.
Clean burner (see Cleaning and Mainte-
nance, page 20) or replace burner orifice
2. Replace damaged burner
3. Replace gas regulator
1. Check burner for dirt and debris. If
found, clean burner (see Cleaning and
Maintenance, page 20)
2. Replace gas regulator
3. Problem will stop after a few hours of
operation
1. Turn control knob to LO position and
let warm up for a minute
2. Operate burner until air is removed from
line. Have gas line checked by local
natural gas company
3. Observe minimum installation clear-
ances (see pages 7 through 9)
4. Clean burners (see Cleaning and Mainte-
nance, page 20) or replace burner orifice
1. Refer to Air for Combustion and Venti-
lation requirements (pages 4 through 6)
1. Properly locate logs (see Installing Logs,
page 14)
2. Eliminate source of drafts around heater
3. Clean out air holes at burner inlet. Peri-
odically repeat as needed
4. Remove blockage or replace burner
1. Turn heater off when using furniture
polish, wax, carpet cleaners, or similar
products
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Inlet gas pressure is too low
2. Burner orifice clogged
3. Burner orifice diameter is too small
1. Manifold pressure is too low
2. Burner orifice clogged
1. Burner orifice is clogged or damaged
2. Damaged burner
3. Gas regulator defective
1. Not enough air
2. Gas regulator defective
3. Residues from manufacturing processes
and logs curing
1. Turning control knob to HI position
when burner is cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orifice
1. Not enough combustion/ventilation air
1. Improper log placement
2. Drafts or other air currents affecting
flame pattern
3. Air holes at burner inlet blocked
4. Burner flame holes blocked
1. When heated, vapors from furniture pol-
ish, wax, carpet cleaners, etc. turn into
white powder residue
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