Vanguard VN1800C Owner's Operation And Installation Manual page 27

TROUBLE-
SHOOTING
Continued
100750
OBSERVED POSSIBLE
PROBLEM
CAUSE
When control knob is
1. Gas supply turned off or
pressed in and turned
to the PILOT/IGN
position, there is spark 2. Control knob not fully
at ODS/pilot but no
ignition (non-thermo-
stat model only).
When ignitor button is
pressed in, there is a
spark at ODS/pilot but
no ignition (thermo-
stat models only). 3. Air in gas lines when
4. ODS/pilot is clogged.
5. Gas regulator setting is
6. Thermostat control knob
ODS/pilot lights but
1. Control knob not fully
flame goes out when
control knob is 2. Control knob not pressed
released
3. Manual shutoff valve not
4. Thermocouple connection
5. Pilot flame not touching
6. Thermocouple damaged.
7. Control valve damaged.
8. Safety interlock system
manual shutoff valve
closed.
pressed in while being
turned to PILOT/IGN
position (non-thermostat
models only).
Thermostat control knob
not fully pressed in while
pressing ignitor button
(thermostat models only).
installed.
not correct.
not in pilot position
(thermostat models only).
pressed in.
in long enough.
fully open.
loose at control valve.
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
has been triggered
(thermostat models only).
REMEDY
1. Turn on gas supply or
open manual shutoff
valve.
2. Fully press in control
knob while turning to PI-
LOT/IGN position (non-
thermostat models only).
Fully press in thermostat
control knob while press-
ing ignitor button (ther-
mostat models only).
3. Continue holding down
control knob. Repeat
igniting operation until
air is removed.
4. Clean ODS/pilot (see
Cleaning and Mainte-
nance, page 26) or
replace ODS/pilot
assembly.
5. Replace gas regulator.
6. Turn thermostat control
knob to pilot position.
1. Press in control knob
fully.
2. After ODS/pilot lights,
keep control knob
pressed in 30 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 Mainte-
nance, page 26) or
replace ODS/pilot
assembly.
6. Replace thermocouple.
7. Replace control valve.
8. Wait one minute for
safety interlock system
to reset. Repeat ignition
operation.
Continued
27