Vanguard VSGF28NTC Owner's Operation And Installation Manual page 20

UNVENTED NATURAL GAS FIREPLACE
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
One or both burners do not light after ODS/
pilot is lit
Delayed ignition of one or both burners
Burner backfiring during combustion
Yellow flame in front burner during burner
combustion
Slight smoke or odor during initial operation
Fireplace produces a whistling noise when
burners are lit
White powder residue forming within burner
box or on adjacent walls or furniture
Dark residue on logs or inside of fireplace
Note: After removing all causes of residue
deposits, completely clean fireplace and ap-
pliance of all residue before reusing appliance.
For more information, visit www.desatech.com
®
POSSIBLE CAUSE
1. Burner orifice(s) clogged
2. Burner orifice(s) diameter is too small
3. Inlet gas pressure is too low
4. Mislocated crossover tube
1. Manifold pressure is too low
2. Burner orifice(s) clogged
3. Mislocated crossover tube
1. Burner orifice is clogged or damaged
2. Damaged burner
3. Gas regulator defective
1. Not enough air
2. Gas regulator defective
1. Residues from manufacturing processes
and logs curing
1. Turning control knob to HI position
when burners are cold
2. Air in gas line
3. Air passageways on fireplace blocked
4. Dirty or partially clogged burner
orifice(s)
1. When heated, vapors from furniture pol-
ish, wax, carpet cleaners, etc. turn into
white powder residue
1. Improper log placement
2. Drafts or other air currents affecting
flame pattern
3. Air holes at burner inlet blocked
4. Burner flame holes blocked
www.desatech.com
REMEDY
1. Clean burner(s) (see Cleaning and Main-
2. Replace burner orifice(s)
3. Contact local natural gas company
4. Contact qualified service person
1. Contact local natural gas company
2. Clean burner(s) (see Cleaning and Main-
3. Contact qualified service person
1. Clean burner (see Cleaning and Mainte-
2. Replace damaged burner
3. Replace gas regulator
1. Check burner(s) for dirt and debris. If
2. Replace gas regulator
1. Problem will stop after a few hours of
1. Turn control knob to LO position and
2. Operate burners until air is removed
3. Observe minimum installation clear-
4. Clean burners (see Cleaning and Main-
1. Turn heater off when using furniture
1. Properly locate logs (see Installing Logs,
2. Eliminate source of drafts around heater
3. Clean out air holes at burner inlet. Peri-
4. Remove blockage or replace burner
20
tenance, page 18) or replace burner
orifice(s)
tenance, page 18) or replace burner
orifice(s)
nance, page 18) or replace burner orifice
found, clean burner(s) (see Cleaning and
Maintenance, page 18)
operation
let warm up for a minute
from line. Have gas line checked by lo-
cal natural gas company
ances (see pages 8 through 10)
tenance, page 18) or replace burner
orifice(s)
polish, wax, carpet cleaners, or similar
products
page 13)
odically repeat as needed
Continued
107157