www.desatech.com
119421-01E
22
TROUbLESHOOTING
Continued
POSSIBLE CAUSE
1. Control knob not fully
pressed in
2. Control knob not pressed in
long enough
3. Equipment shutoff valve not
fully open
4. Pilot flame not touching
thermocouple, which al
-
lows thermocouple to cool,
causing 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
ODS/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
1. Manifold pressure is too
low
2. Burner orifice clogged
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 manufac-
turing processes and logs
curing
1. Not enough combustion/
ventilation air
REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep
control knob pressed in 30
seconds
3. Fully open equipment shut-
off valve
4. A) Contact local propane/
LP or natural gas com-
pany
B) Clean ODS/pilot (see
Cleaning and Maintenance
,
page 19) or replace ODS/
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 19)
or replace burner orifice
2. Contact local propane/LP
or natural gas company
1. Contact local propane/LP
or natural gas company
2. Clean burner (see
Cleaning
and Maintenance
, page 19)
or replace burner orifice
1. Clean burner (see
Cleaning
and Maintenance
, page 19)
or replace burner orifice
2. Replace damaged burner
3. Replace gas regulator
1. Check burner for dirt and
debris. If found, clean
burner (see
Cleaning and
Maintenance
, page 19)
2. Replace gas regulator
3. Problem will stop after a few
hours of operation
1. Refer to
Air for Combustion
and Ventilation
require-
ments (page 5)
OBSERVED PROBLEM
ODS/pilot lights but flame
goes out when control knob
is released
Burner does light after ODS/
pilot is lit
Delayed ignition of burner
Burner backfiring during
combustion
Slight smoke or odor during
initial operation
Moisture/condensation no-
ticed on windows
