www.desatech.com
19
113048-01F
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 of burner(s)
Burner backfiring during com-
bustion
REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep con-
trol knob pressed in 30 seconds
3. Wait one minute for safety in-
terlock system to reset. Repeat
ignition operation
4. Fully open equipment shutoff
valve
5. Hand tighten until snug, then
tighten 1/4 turn more
6. A) Contact local natural or
propane/LP gas company
B) Clean ODS/pilot (see
Cleaning and Maintenance
,
page 17) or replace ODS/pilot
assembly
7. Replace pilot assembly
8. Replace control valve
1. Clean burner (see
Cleaning
and Maintenance
, page 17) or
replace burner orifice
2. Contact local natural or pro-
pane/LP gas company
1. Contact local natural or pro-
pane/LP gas company
2. Clean burner (see
Cleaning
and Maintenance
, page 17) or
replace burner orifice
1. Clean burner (see
Cleaning
and Maintenance
, page 17) or
replace burner orifice
2. Replace burner
3. Replace gas regulator
POSSIBLE CAUSE
1. Control knob not fully pressed
in
2. Control knob not pressed in
long enough
3. Safety interlock system has
been triggered (thermostat
models only)
4. Equipment shutoff valve not
fully open
5. Thermocouple connection
loose at control valve
6. Pilot flame not touching ther-
mocouple, which allows ther-
mocouple 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
7. Thermocouple damaged
8. Control valve damaged
1. Burner orifice is clogged
2. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice is clogged
1. Burner orifice is clogged or
damaged
2. Burner damaged
3. Gas regulator defective
TROUBLESHOOTING
Continued
