Desa (V)CB36P(E) Installation And Owner's Operation Manual page 26

OBSERVED PROBLEM
Manual Ignition System Only
Pilot lights but flame goes out
when control knob is released
Burner does not light after pilot is
lit or cycles during operation.
Delayed ignition at burner
Burner backfiring during com-
bustion
Slight smoke or odor during
initial 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, causing
pilot to go out. This problem
could be caused by one or
more 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
5. Improper venting or exces-
sive blockage
1. Manifold pressure 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
www.desatech.com
REMEDY
1. Press in gas control knob
fully
2. After pilot lights, keep gas con-
trol 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 23) 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 23) or
replace burner orifice
2. Contact local propane/LP or
natural gas company
3. Reconnect leads
4. Replace thermopile
5. Have the vent system inspect-
ed, including the termination
cap. Remove any restriction
or obstruction
1. Contact local propane/LP or
natural gas company
2. Clean burner (see Cleaning
and Maintenance, page 23) or
replace burner orifice
1. Clean burner (see Cleaning
and Maintenance, page 23) or
replace burner orifice
2. Replace damaged burner
3. Replace gas control
1. Problem will stop after a few
hours of operation
117437-01B