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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 operation
Moisture/condensation noticed on windows
Heater produces a whistling noise when
burner is lit
White powder residue forming within burner
box or on adjacent walls or furniture
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POSSIBLE CAUSE
1. Burner orifice clogged
2. Inlet gas pressure is too low
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 burners
3. Gas regulator defective
1. Not enough air
2. Gas regulator defective
3. Residues from manufacturing processes
and logs curing
1. Not enough combustion/ventilation air
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
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19
OWNER'S MANUAL
REMEDY
1. Clean burners (see Cleaning and Mainte-
nance, page 17) or replace burner orifice
2. Contact local natural gas company
3. Replace burner orifice
1. Contact local natural gas company
2. Clean burners (see Cleaning and Mainte-
nance, page 17) or replace burner orifice
1. Clean burners (see Cleaning and Mainte-
nance, page 17) or replace burner orifice
2. Replace damaged burner
3. Replace gas control
1. Check burners for dirt and debris. If
found, clean burners (see Cleaning and
Maintenance, page 17)
2. Replace gas control
3. Problem will stop after a few hours of
operation
1. Refer to Air for Combustion and Venti-
lation requirements (page 4)
1. Turn control knob to LO position and
let warm up for a minute
2. Operate burners until air is removed
from line. Have gas line checked by lo-
cal natural gas company
3. Observe minimum installation clear-
ances (see pages 7 through 9)
4. Clean burners (see Cleaning and Mainte-
nance, page 17) or replace burner orifice
1. Turn heater off when using furniture
polish, wax, carpet cleaners, or similar
products
For more information, visit www.desatech.com
Continued
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