Desa LSF20NT Safety Information And Installation Manual page 18

OBSERVED PROBLEM
Yellow flame during burner
combustion
Slight smoke or odor during
initial operation
Heater produces a clicking/tick-
ing noise just after burner is lit
or shut off
Heater produces a whistling
noise when burner is lit
White powder residue forming
within burner box or on adjacent
walls or furniture
Heater shuts off in use (ODS
operates)
18
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Not enough air
2. Gas regulator defective
3. Clogged or dirty burner
4. Air blowing into heater
5. Burner not positioned in
bracket properly
1. Residues from manufacturing
processes
1. Metal expanding while heating
or contracting while cooling
1. Turning control knob to the
highest 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 polish, wax, carpet
cleaner, etc., may turn into
white powder residue
1. Not enough fresh air is avail-
able
2. Low line pressure
3. O D S / p i l o t i s p a r t i a l l y
clogged
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REMEDY
1. Check burner for dirt and
debris. If found, clean burner
(see Cleaning and Mainte-
nance, page 15)
2. Replace gas regulator
3. Clean burner (see Cleaning
and Maintenance, page 15)
4. Turn off air supply
5. Have a qualified service person
or installer inspect burner
1. Problem will stop after a few
hours of operation
1. This is common with most heat-
ers. If noise is excessive, contact
qualified service person
1. Turn control knob to the low-
est position and let warm up
for a minute
2. Operate burner until air is
removed from line. Have gas
line checked by local natural
or propane/LP gas company
3. Observe minimum installation
clearances (see Figure 4, page 8)
4. Clean burner (see Cleaning
and Maintenance, page 15)
or replace burner orifice
1. Turn heater off when using
furniture polish, wax, carpet
cleaners or similar products
1. Open window and/or door for
ventilation
2. Contact local natural or pro-
pane/LP gas company
3. Clean ODS/pilot (see Cleaning
and Maintenance, page 15)
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