Troubleshooting
Guide
28|
Page
9)
COMBUSTION
CHAMBER
‐
Inspect
the
combustion
chamber
with
a
bright
flashlight.
a.
Remove
the
exhaust
venting
from
top
of
the
unit
for
the
DV
model
b.
Place
one
towel
at
the
bottom
of
the
combustion
chamber,
protecting
the
discharge
of
the
fan
(fan
port),
as
well
as
drape
another
towel
covering
the
square
opening
of
the
combustion
chamber
(to
prevent
airborne
debris)
c.
Turn
on
the
shop
vacuum
and
vacuum
all
of
the
dirt
from
the
combustion
chamber.
d.
At
the
same
time,
with
the
air
compressor,
blow
air
down
through
the
top
of
the
heat
exchanger
through
the
vent
collar
to
remove
additional
contaminants.
10)
HEAT
EXCHANGER
‐
If
there
is
a
white,
crusty
solid
buildup
in
the
heat
exchanger,
please
contact
the
Technical
Service
Department
for
further
instruction.
11)
SENSORS
–
a.
Clean
the
flame
sensor
and
AFR
with
sandpaper,
thoroughly
to
a
bright
finish.
It
is
important
to
be
very
gentile
with
the
sensor
rods
while
cleaning
them,
as
they
will
easily
bend
out
of
place.
Their
original
position
relative
to
the
burner
needs
to
be
unaltered
in
order
to
function
properly.
12)
REASSEMBLE
‐
Reassemble
the
unit
in
reverse
order.
Key
points
to
remember:
a.
Inspect
all
of
the
gaskets.
b.
Be
aware
of
the
black
O
‐
ring
and
mesh
filter
on
the
gas
valve
inlet.
c.
Reconnect
the
plastic
tube
from
the
gas
valve
to
the
bottom
of
the
combustion
chamber.
d.
Reattach
all
components
that
the
manifold
screws
secure
in
their
places.
e.
Reconnect
all
wires
to
the
computer
board
and
any
other
clips.
f.
Do
not
have
any
screws
left
over.
Figure
29
Figure
30
