Vanguard SVYD18N Owner's Operation And Installation Manual page 22

TROUBLE-
SHOOTING
Continued
22
OBSERVED POSSIBLE
PROBLEM CAUSE
When ignitor button 1. Gas supply turned off or
is pressed, there is
spark at ODS/pilot
but no ignition 2. Control knob not in
3. Control knob not
4. Air in gas lines when
5. ODS/pilot is clogged
6. Gas regulator setting is
ODS/pilot lights but 1. Control knob not fully
flame goes out when
control knob is 2. Control knob not
released
3. Safety interlock system
4. Manual shutoff valve
5. Pilot flame not touching
6. Thermocouple connec-
7. Thermocouple damaged
8. Control valve damaged
manual shutoff valve
closed
PILOT position
pressed in while in
PILOT position
installed
not correct
pressed in
pressed in long enough
has been triggered
not fully open
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
tion loose at control
valve
REMEDY
1. Turn on gas supply or
open manual shutoff
valve
2. Turn control knob to
PILOT position
3. Press in control knob
while in PILOT position
4. Continue holding down
control knob. Repeat
igniting operation until
air is removed
5. Clean ODS/pilot (see
Cleaning and Mainte-
nance, page 21) or
replace ODS/pilot
assembly
6. Replace gas regulator
1. Press in control knob
fully
2. After ODS/pilot lights,
keep control knob
pressed in 30 seconds
3. Wait one minute for
safety interlock system
to reset. Repeat ignition
operation
4. Fully open manual
shut-off valve
5. A) Contact local
natural gas company
B) Clean ODS/pilot
(see Cleaning and
Maintenance, page 21)
or replace ODS/pilot
assembly
6. Hand tighten until
snug, then tighten 1/4
turn more
7. Replace thermocouple
8. Replace control valve
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