Desa GVC35NA - Manual (Page 26)

26
100749
TROUBLE-
SHOOTING
Continued
OBSERVED
PROBLEM
Burner backfiring
during combustion.
Yellow flame during
burner combustion.
Slight smoke or odor
during initial opera-
tion.
Burner fails to
respond to thermo-
stat.
Heater produces a
whistling noise when
burner is lit.
REMEDY
1. Clean burner (see
Cleaning and Mainte-
nance, page 23) or
replace burner orifice
(see Changing Burner
Orifice, page 30).
2. Replace burner.
3. Replace control valve.
4. See above.
1. Check burner for dirt
and debris. If found,
clean burner (see
Cleaning and Mainte-
nance, page 23).
2. Replace control valve.
1. Problem will stop after a
few hours of operation.
1. Light pilot burner (see
Lighting Instructions,
page 18).
2. Pilot flame needs
adjusting. Contact a
qualified service person.
3. Clean pilot burner (see
Cleaning and Mainte-
nance, page 23).
4. Replace control valve.
1. Operate burner until air
is removed from line.
Have gas line checked
by local natural gas
company.
2. Observe minimum
installation clearances
(see Figure 3, page 7).
3. Clean burner (see
Cleaning and Mainte-
nance, page 23) or
replace burner orifice
(see Changing Burner
Orifice, page 30).
POSSIBLE
CAUSE
1. Burner orifice is
clogged or damaged.
2. Burner damaged.
3. Gas regulator defective.
4. Delayed ignition.
1. Not enough air.
2. Gas regulator defective.
1. Residues from manu-
facturing processes.
1. Pilot flame not lit.
2. Pilot flame not prop-
erly heating end of
thermocouple.
3. Pilot burner orifice
clogged or damaged.
4. Control valve defec-
tive.
5. Temperature at ther-
mostat bulb satisfied.
1. Air in gas line.
2. Air passageways on
heater blocked.
3. Dirty or partially
clogged burner orifice.