Desa Tech CGN20T - Manual (Page 24)

24
103873
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
REMEDY
1. Clean burner (see Clean-
ing and Maintenance,
page 22) or replace burner
orifice
2. Replace burner orifice
3. Contact local natural gas
company
1. Contact local natural gas
company
2. Clean burner (see Clean-
ing and Maintenance,
page 22) or replace burner
orifice
1. Clean burner (see Clean-
ing and Maintenance,
page 22) 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 22)
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 installa-
tion clearances (see Figure
4, page 10)
4. Clean burner (see Clean-
ing and Maintenance,
page 22) or replace burner
orifice
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 HI position when
burner is cold
2. Air in gas line
3. Air passageways on
heater blocked
4. Dirty or partially
clogged burner orifice