www.desatech.com
121353-01F
25
OBSERVED PROBLEM
ODS/pilot lights but flame
goes out when control knob
is released
Burner does not light after
ODS/pilot is lit
Delayed ignition burner
Burner backfiring during com
-
bustion
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 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
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
3. Thermopile leads discon-
nected or improperly con-
nected
4. Burners will not come on in
remote position
1. Manifold pressure is too
low
2. Burner orifice clogged
1. Burner orifice is clogged or
damaged
2. Damaged burner
3. Gas regulator defective
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 natural or
propane/LP gas company
B) Clean ODS/pilot (see
Cleaning and Maintenance
,
page 23) 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 23)
or replace burner orifice
2. Contact local natural or
propane/LP gas company
3. Reconnect leads (see
Wir-
ing Diagram
, page 24)
4. Replace battery in transmit-
ter and receiver
1. Contact local natural or
propane/LP 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
TROUbLESHOOTING
Continued
