Desa FLAME-MAX UNVENTED (VENT-FREE) PROPANE/LP GAS LOG HEATER - Manual (Page 17)

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OWNER’S MANUAL
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
Burner does not light after ODS/pilot is lit
Delayed ignition burner
Burner backfiring during combustion
Slight smoke or odor during initial opera-
tion
Heater produces a whistling noise when
burner is lit
Moisture/condensation noticed on windows
REMEDY
1. Contact local natural gas company
2. Clean burner (see Cleaning and Mainte-
nance, page 15) or replace burner orifice
3. Replace burner orifice
1. Contact local propane/LP gas company
2. Clean burner (see Cleaning and Mainte-
nance, page 15) or replace burner orifice
1. Clean burner (see Cleaning and Mainte-
nance, page 15) 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 15)
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 6 through 9)
4. Clean burners (see Cleaning and Mainte-
nance, page 15) or replace burner orifice
1. Refer to Air for Combustion and Venti-
lation requirements (page 3 through 5)
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
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