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110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
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TROUBLESHOOTING
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
One or more burners do not light after ODS/
pilot is lit
Delayed ignition of one or more burners
Burner backfiring during combustion
Yellow flame in front/middle burner
during burner combustion (VRL24NT/PT,
VRL24NR/PR, VRL30NT/PT, VRL30NR/
PR, CSG3924NT/PT, CSG3924NR/PR,
CSG3930NR/PR)
Yellow flame in front burner during burner
combustion (CTB3924NT/PT,
CTB3924NR/PR)
Slight smoke or odor during initial operation
Heater produces a whistling noise when
burners are lit
White powder residue forming within burner
box or on adjacent walls or furniture
Moisture/condensation noticed on windows
REMEDY
1. Contact local natural or propane/LP gas
company
2. Clean burner(s) (see Cleaning and Mainte-
nance, page 23) or replace burner orifice(s)
3. Contact qualified service person
4. Reconnect leads (see Wiring Diagram,
page 28)
5. Replace battery in transmitter and
receiver
1. Contact local natural or propane/LP gas
company
2. Clean burner(s) (see Cleaning and Main-
tenance, page 23) or replace burner
orifice(s)
3. Contact qualified service person
1. Clean burner (see Cleaning and Mainte-
nance, page 23) or replace burner orifice
2. Replace damaged burner
3. Replace gas regulator
1. Check burner(s) for dirt and debris. If
found, clean burner(s) (see Cleaning and
Maintenance, page 23)
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 burners until air is removed
from line. Have gas line checked by lo-
cal natural or propane/LP gas company
3. Observe minimum installation clear-
ances (see pages 8 through 10)
4. Clean burners (see Cleaning and Main-
tenance, page 23)
1. Turn heater off when using furniture
polish, wax, carpet cleaners, or similar
products
1. Refer to Air for Combustion and Venti-
lation requirements (page 5)
POSSIBLE CAUSE
1. Inlet gas pressure is too low
2. Burner orifice(s) clogged
3. Mislocated crossover tube
4. Thermopile leads disconnected or im-
properly connected (Remote-Ready
Models Only)
5. Burners will not come on in remote po-
sition (Remote-Ready Models Only)
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 heater blocked
4. Dirty or partially clogged burner
orifice(s)
1. When heated, vapors from furniture pol-
ish, wax, carpet cleaners, etc. may turn
into white powder residue
1. Not enough combustion/ventilation air