Troubleshooting
Guide
30|
Page
5)
FAN
a.
The
fan
is
held
in
by
two
screws.
They
face
the
bottom
of
the
heater,
and
can
be
reached
by
two
holes
in
the
bottom
of
the
case
with
a
long
screwdriver.
b.
Slide
it
left
to
release
it
from
the
grooves.
6)
WATERWAYS
a.
If
the
unit
has
not
been
drained
at
this
point,
now
is
the
time
to
do
so.
Refer
to
the
Draining
the
Unit
procedure
in
the
troubleshooting
procedures
section.
b.
Disconnect
the
waterway
clips
pictured
at
the
right.
c.
Place
a
dry
towel
in
the
bottom
of
the
unit
case
when
dislodging
the
pipes
from
their
sockets.
7)
REMOVE
THE
HEAT
EXCHANGER
a.
Remove
the
two
screws
at
the
top
of
the
heat
exchanger.
b.
The
heat
exchanger
should
be
free
to
be
removed.
If
there
are
any
missed
wires
still
connected
to
the
heat
exchanger
assembly,
remove
them
so
the
heat
exchanger
is
completely
free.
8)
REPLACE
THE
HEAT
EXCHANGER
COMPONENTS
a.
Remove
and
inspect
the
new
heat
exchanger
making
sure
it
is
designed
for
the
correct
model
and
is
not
damaged
at
all.
b.
Install
the
following
items
from
the
old
exchanger
onto
the
new
one:
i.
Overheat
Cutoff
Fuse
ii.
Freeze
protection
blocks
iii.
Plastic
pressure
port
iv.
Hi
‐
Limit
switch
v.
Hot
water
thermistor
vi.
Silicon
Vent
Gasket
9)
REASSEMBLE
‐
Reassemble
the
unit
in
reverse
order.
Key
points
to
remember:
a.
All
wires
must
be
reconnected.
Keep
wires
dangling
out
in
front
of
the
unit,
never
push
them
toward
the
back
where
they
are
not
visible;
you
will
forget
about
them.
b.
Inspect
all
of
the
gaskets.
c.
Be
aware
of
the
various
O
‐
rings
on
the
gas
and
water
valves,
along
with
the
waterway
clips.
d.
Reattach
all
extra
components
that
the
manifold
screws
secure
in
their
places.
e.
Do
not
have
any
screws
left
over.
Figure
31
Figure
32
Figure
33
