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22
099404
TROUBLE-
SHOOTING
Continued
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 opera-
tion
Heater produces a
whistling noise when
burner is lit
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 manu-
facturing processes
1. Turning control knob
to HIGH position
when burner is cold
2. Air in gas line
3. Air passageways on
heater blocked
4. Dirty or partially
clogged burner orifice
REMEDY
1. Clean burner orifice (see
Cleaning and Mainte-
nance, page 20) or
replace burner orifice
2. Replace burner orifice
3. Contact local natural gas
company
1. Contact local natural gas
company
2. Clean burner orifice (see
Cleaning and Mainte-
nance, page 20) or
replace burner orifice
1. Clean burner orifice (see
Cleaning and Mainte-
nance, page 20) 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 Mainte-
nance, page 20)
2. Replace gas regulator
1. Problem will stop after a
few hours of operation
1. Turn control knob to
LOW position and let
warm up for a minute
2. Operate burner until air
is removed from line.
Have gas checked by
local natural gas com-
pany
3. Observe minimum
installation clearances
(see Figure 4, page 10)
4. Clean burner (see
Cleaning and Mainte-
nance, page 20) or
replace burner orifice.