Stovax 8455 - Manual (Page 20)

20
FAULT FINDING
IGNITION
FUNCTIONAL
CHECK
1
PILOT
WILL
NOT
LIGHT
Ensure
there
is
no
debris
around
the
pilot
assembly,
e.g
coal,
soot,
etc
which
could
short
the
spark,
clean
the
area.
Check
for
fluff
in
the
pilot
aeration
hole.
See
Diagram
7,
arrow
A.
There
is
a
blockage
in
the
system,
check
the
inlet
test
point,
the
mag
seating,
valve
and
pilot
filter.
Operate
the
valve.
Is
there
a
spark?
Consult
users
book
and
retry
Ensure
gap
between
the
electrode
&
thermocouple
is
as
Dia.
7
&
retry.
If
gap
is
OK
then
first
change
the
ignition
lead
&
retry,
if
still
no
good
then
change
gas
valve
Is
the
control
being
operated
correctly?
Will
the
pilot
light
with
a
match
Is
the
gas
turned
on
to
the
appliance?
Check
isolation
tap
and
gas
meter,
retry
Purge
the
gas
pipes
and
retry
See
“NO
SPARK”
chart*
System
OK
Is
the
gas
pressure
correct?
Has
the
system
got
any
air
in
it?
Does
the
pilot
light?
Correct
and
retry
YES
YES
YES YES YES NO NO NO
NO
NO NO NO YES YES
IGNITION
FUNCTIONAL
CHECK
2
NO
SPARK
Ensure
there
is
no
debris
around
the
pilot
assembly,
e.g
coal,
soot,
etc
which
could
short
the
spark,
clean
the
area.
Consult
users
instructions,
retry
Operate
the
valve.
Light
the
pilot,
does
the
valve
click?
Is
the
gap
between
the
electrode
&
thermocouple
as
in
Dia.
7?
Is
the
control
being
operated
correctly?
Reset
the
pilot
burner
Correct
and
retry
Has
ignition
lead
become
detached
or
is
connection
poor?
Replace
the
ODS
unit
Replace
the
electrode
lead
and
retry
Replace
the
gas
valve
and
retry
Check
for
defective
or
damaged
control
knob
spindle
or
cam
operation.
Check
for
correct
location
of
piezo
components.
Correct
and
retry
Remove
the
electrode
lead
from
the
piezo.
Operate
the
valve.
Does
a
spark
jump
from
the
piezo
to
the
valve
body?
Remove
the
electrode
lead
from
electrode
with
insulated
pliers
hold
the
tip
3.5mm
from
the
pilot
pipework,
is
there
a
spark
when
the
valve
‘clicks’?
Is
the
electrode
wire
detached
from
the
piezo
in
the
valve?
Replace
the
gas
valve,
retry
YES
YES
NO
NO
*
NO
NO
YES YES
YES