Desa VN600BA - Manual (Page 19)

www.desatech.com 110720-01J 19
OBSERVED PROBLEM
ODS/pilot lights but flame goes
out when control knob is re-
leased
Burner does not light after ODS/
pilot is lit
Delayed ignition of burner
Burner backfiring during com-
bustion
Burner plaque(s) does not glow
(Infrared models only)
Yellow flame during burner
combustion
TROUBLESHOOTING
Continued
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 17) or replace ODS/pilot
assembly
6. Replace pilot assembly
7. Replace control valve
1. Clean burner orifice (see Clean-
ing 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 orifice (see Clean-
ing and Maintenance, page 17)
or replace burner orifice
1. Clean burner orifice (see Clean-
ing and Maintenance, page 17)
or replace burner orifice
2. Replace burner
3. Replace gas regulator
1. Turn control knob until it locks
at desired setting
2. Contact local natural or pro-
pane/LP gas company
3. Replace burner
1. Check burner for dirt and
debris. If found, clean burner
(see Cleaning and Mainte-
nance, page 17)
2. Contact local natural or pro-
pane/LP gas company
3. Replace gas regulator
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
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
6. Thermocouple damaged
7. 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
1. Control knob set between
locked positions
2. Inlet gas pressure is too low
3. Plaque damaged
1. Not enough air
2. Inlet gas pressure is too low
3. Gas regulator defective