Desa HDVF3018N Owner's Operation And Installation Manual page 22

OBSERVED pROBLEM
Burner does light after ODS/
pilot is lit
Delayed ignition of 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
Heater produces a clicking/tick-
ing noise just after burner is lit
or shut off
22
TROUbLESHOOTING
Continued
pOSSIBLE CAUSE
1. Burner orifice clogged
2. Inlet gas pressure is too low
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. Not enough combustion/ven-
tilation air
1. Turning control knob to HI
or position 5 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
cleaners, etc. may turn into
white powder residue
1. Metal expanding while heating
or contracting while cooling
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REMEDY
1. Clean burner (see Cleaning
and Maintenance, page 19)
or replace burner orifice
2. Contact local propane/LP or
natural gas company
1. Contact local propane/LP or
natural gas company
2. Clean burner (see Cleaning
and Maintenance, page 19)
or replace burner orifice
1. Clean burner (see Cleaning
and Maintenance, page 19)
or replace burner orifice
2. Replace damaged burner
3. Replace gas regulator
1. Check burner for dirt and de-
bris. If found, clean burner (see
Cleaning and Maintenance,
page 19)
2. Replace gas regulator
3. Problem will stop after a few
hours of operation
1. Refer to Air for Combustion
and Ventilation requirements
(page 5)
1. Turn control knob to LO or
position 1 and let warm up for
a minute
2. Operate burner until air is
removed from line. Have gas
line checked by local propane/
LP or natural gas company
3. Observe minimum installa-
tion clearances (see page 9)
4. Clean burner (see Cleaning
and Maintenance, page 19)
or replace burner orifice
1. Turn heater off when using
furniture polish, wax, carpet
cleaners or similar products
1. This is normal with most heat-
ers. If noise is excessive, con-
tact qualified service person
119421-01A