DESA Heating Products SF20NT Información De Seguridad Y Manual De Instalación página 17

OBSERVED PROBLEM
ODS/pilot lights but flame
goes out when control knob is
released
Burner(s) does not light after
ODS/pilot is lit
Delayed ignition of burner(s)
Burner backfiring during com-
bustion
116307-01C
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. Thermocouple connection
loose at control valve
5. 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
6. Thermocouple damaged
7. Control valve damaged
8. Safety interlock system has
been triggered (thermostat
models only)
1. Burner orifice(s) is clogged
2. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice(s) is clogged
1. Burner orifice(s) is clogged or
damaged
2. Burner damaged
3. Gas regulator defective
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REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep con-
trol knob pressed in 30 seconds
3. Fully open equipment shutoff
valve
4. Hand tighten until snug, then
tighten 1/4 turn more
5. A) Contact local natural or
propane/LP gas company
B) Clean ODS/pilot (see
Cleaning and Maintenance,
page 15) or replace ODS/pilot
assembly
6. Replace pilot assembly
7. Replace control valve
8. Wait one minute for safety in-
terlock system to reset. Repeat
ignition operation
1. Clean burner orifice(s) (see
Cleaning and Maintenance,
page 15) or replace burner
orifice(s)
2. Contact local natural or pro-
pane/LP gas company
1. Contact local natural or pro-
pane/LP gas company
2. Clean burner orifice(s) (see
Cleaning and Maintenance,
page 15) or replace burner
orifice(s)
1. Clean burner orifice(s) (see
Cleaning and Maintenance,
page 15) or replace burner
orifice(s)
2. Replace burner
3. Replace gas regulator
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