Desa VTGF33NRB - Manual (Page 28)

www.desatech.com 113134-01F 8
OBSERVED PROBLEM
Burner backfiring during
combustion
Slight smoke or odor during initial
operation
Moisture/condensation noticed
on windows
Heater produces a whistling noise
when burner is lit
When ignitor button is pressed,
there is no spark at ODS/pilot
(manual ignition mode)
REMEDY
1. Clean burner (see Cleaning
and Maintenance, page 25) or
replace burner orifice
2. Replace damaged burner
3. Replace regulator
1. Check burner for dirt and
debris. If found, clean burner
(see Cleaning and Mainte-
nance, page 25)
2. Replace regulator
3. Problem will stop after a few
hours of operation
1. Refer to Air for Combustion
and Ventilation requirements
(page 5)
1. Turn control knob to LO posi-
tion and let warm up for a
minute
2. Operate burner until air is
removed from line. Have gas
line checked by local natural
or propane/LP gas company
3. Observe minimum installation
clearances (see page 8)
4. Clean burner (see Cleaning
and Maintenance, page 25) or
replace burner orifice
1. Reconnect ignitor cable
2. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
3. Tighten nut holding piezo
ignitor to base panel of log
set. Nut is located behind base
panel
4. Replace ignitor cable
5. Replace piezo ignitor
6. Replace pilot assembly
7. Replace pilot assembly
TROUBLEShOOTING
Continued
POSSIBLE CAUSE
1. Burner orifice is clogged or
damaged
2. Damaged burner
3. Gas regulator defective
1. Not enough air
2. Gas regulator defective
3. Residues from manufacturing
processes and logs curing
1. Not enough combustion/ven-
tilation air
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
1. Ignitor electrode not con-
nected to ignitor cable
2. Ignitor cable pinched or
wet
3. Piezo ignitor nut is loose
4. Broken ignitor cable
5. Bad piezo ignitor
6. Ignitor electrode broken
7. Ignitor electrode positioned
wrong