18
104433
VENT-FREE NATURAL GAS HEATER
15,000 TO 30,000 BTU/HR
OBSERVED PROBLEM
Burner does not light after ODS/pilot is lit
Delayed ignition of burner
Burner backfiring during combustion
Yellow flame during burner combustion
Slight smoke or odor during initial operation
Heater produces a whistling noise when
burner is lit
White powder residue forming within burner
box or on adjacent walls or furniture
REMEDY
1. Clean burner (see Cleaning and Mainte-
nance, page 16) or replace burner orifice
2. Replace burner orifice
3. Contact local natural gas company
1. Contact local natural gas company
2. Clean burner (see Cleaning and Mainte-
nance, page 16) or replace burner orifice
1. Clean burner (see Cleaning and Mainte-
nance, page 16) or replace burner orifice
2. Replace burner
3. Replace gas regulator
1. Check burner for dirt and debris. If
found, clean burner (see Cleaning and
Maintenance, page 16)
2. Replace gas regulator
1. 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 Figure 10, page 8)
4. Clean burner (see Cleaning and Mainte-
nance, page 16) or replace burner orifice
1. Turn heater off when using furniture
polish, wax, carpet cleaners, or similar
products
POSSIBLE CAUSE
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 damaged
3. Gas regulator defective
1. Not enough air
2. Gas regulator defective
1. Residues from manufacturing processes
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. When heated, vapors from furniture pol-
ish, wax, carpet cleaners, etc. turn into
white powder residue
TROUBLESHOOTING
Continued
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