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22
OBSERVED
PROBLEM
Burner does not light
after ODS/pilot is lit.
(continued from page
21)
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
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 20
) or replace burner
orifice.
1. Clean burner (see Clean-
ing and Maintenance,
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
Maintenance, 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 line checked by local
natural gas company.
3. Observe minimum instal-
lation clearances (see
Figure 2, page 6).
4. Clean burner (see
Clean-
ing and Maintenance,
page 20
) or replace burner
orifice.
POSSIBLE
CAUSE
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. Defective gas regulator
1. Not enough air
2. Defective gas regulator
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
TROUBLE-
SHOOTING
Continued
Continued