Troubleshooting – Desa (V)VC36N Series User Manual
Page 34
www.desatech.com
116200-01H
34
OBSERVED PROBLEM
Pilot lights but flame goes out
when control knob is released
Burner does not light after pilot
is lit
Delayed ignition burner
Burner backfiring during com-
bustion
Slight smoke or odor during initial
operation
REMEDY
1. Press in gas control knob
fully
2. After pilot lights, keep gas
control knob pressed in 30
seconds
3. Fully open equipment shutoff
valve
4. A) Contact local natural or
propane/LP gas company
B) Clean pilot (see Cleaning
and Maintenance, page 31)
or replace pilot assembly
5. Hand tighten until snug, then
tighten 1/4 turn more
6. Replace pilot assembly
7. Replace control valve
1. Clean burner (see Cleaning
and Maintenance, page 31) or
replace burner orifice
2. Contact local propane/LP or
natural gas company
3. Reconnect leads to TP &
TPTH terminals on control
valve
4. Replace thermopile
1. Contact local propane/LP or
natural gas company
2. Clean burner (see Cleaning
and Maintenance, page 31) or
replace burner orifice
1. Clean burner (see Cleaning
and Maintenance, page 31) or
replace burner orifice
2. Replace damaged burner
3. Replace gas control
1. Problem will stop after a few
hours of operation
TROUbLEShOOTING
Continued
POSSIBLE CAUSE
1. Gas control knob not fully
pressed in
2. Gas control knob not pressed
in long enough
3. Equipment shutoff valve not
fully open
4. Pilot flame not touching
thermocouple, which allows
thermocouple to cool, caus-
ing pilot flame to go out. This
problem could be caused by
one or both of the following:
A) Low gas pressure
B) Dirty or partially clogged
pilot
5. Thermocouple connection
loose at control valve
6. Thermocouple damaged
7. Control valve damaged
1. Burner orifice clogged
2. Inlet gas pressure is too low
3. Thermopile leads disconnect-
ed or improperly connected
4. Thermopile is defective
1. Manifold pressure is too low
2. Burner porting or orifice
clogged
1. Burner orifice is clogged or
damaged
2. Damaged burner
3. Gas regulator defective
1. Residues from manufacturing
processes and logs curing