Vanguard Heating VN6A - Manual (Page 18)

18
REMEDY
1. Press in control knob
fully
2. After ODS/pilot lights,
keep control knob
pressed in 10 seconds
3. Fully open manual shut-
off valve
4. Hand tighten until snug,
then tighten 1/4 turn
more
5. A) Contact local natural
gas company
B) Clean ODS/pilot (see
CLEANING AND
M A I N T E N A N C E ,
page 16) or replace
ODS/pilot assembly
6. Replace thermocouple
7. Replace control valve
OBSERVED
PROBLEM
ODS/pilot lights but
flame goes out when
control knob is
released
POSSIBLE
CAUSE
1. Control knob not fully
pressed in
2. Control knob not
pressed in long enough
3. Manual shutoff valve
not fully open
4. Thermocouple connec-
tion loose at control
valve
5. Pilot flame not touching
thermocouple, which
allows 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
6. Thermocouple dam-
aged
7. Control valve damaged
Burner(s) does not
light after ODS/pilot is
lit
Delayed ignition of
burner(s)
Burner backfiring
during combustion
1. Clean burner orifice(s)
(see CLEANING AND
MAINTENANCE, page
16) or replace burner
orifice(s)
2. Replace burner orifice(s)
3. Contact local natural gas
company
1. Contact local natural gas
company
2. Clean burner orifice(s)
(see CLEANING AND
MAINTENANCE, page
16) or replace burner
orifice(s)
1. Clean burner orifice(s)
(see CLEANING AND
MAINTENANCE, page
16) or replace burner
orifice(s)
2. Replace burner
3. Replace gas regulator
1. Burner orifice(s) is
clogged
2. Burner orifice(s) di-
ameter is too small
3. 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