Troubleshooting
Guide
26|
Page
RESETTING
THE
COMPUTER
BOARD:
1)
Verify
that
there
is
no
water
flowing
through
the
unit.
2)
If
a
temperature
remote
controller
has
been
installed,
turn
the
power
off
to
the
remote.
3)
Turn
off
power
to
the
unit,
and
then
turn
on
again.
4)
Push
and
hold
the
“INC”
and
“DEC”
buttons
on
the
computer
board
simultaneously
for
several
seconds
until
the
red
LED
lights
up
solid.
See
Figure
5.26.
5)
Use
the
Power
ON
‐
OFF
switch
to
turn
the
unit
off
then
on
again.
The
computer
board
is
reset.
CHECKING
THE
OVERHEAT
CUTOFF
FUSE
(OHCF):
1)
Locate
the
white
OHCF
which
wraps
around
the
heat
exchanger.
2)
Find
the
white
clip
at
the
end
of
the
two
blue
braided
wires
coming
from
the
OHCF.
3)
Unplug
the
connection.
4)
Test
for
continuity
at
the
end
of
the
OHCF
with
an
ohmmeter.
If
there
is
continuity,
the
OHCF
is
still
intact.
Reconnect
the
plug.
If
there
is
no
continuity,
the
OHCF
has
been
compromised.
If
compromised,
contact
the
technical
service
department
for
further
assistance.
5)
If
an
ohmmeter
is
not
available,
jump
the
plug
connection
on
the
opposite
side
of
the
OHCF
with
a
wire,
paper
clip,
or
other
metal
material.
6)
Restore
power
and
test
unit.
Be
very
cautious
with
this
step,
avoiding
contact
with
the
jumper
device
or
any
other
electrical
wires.
7)
If
the
unit
fires
up,
it
shows
that
the
OHCF
has
been
compromised
and
the
problem
was
with
the
OHCF.
If
so,
contact
the
technical
service
department
for
further
assistance.
If
the
unit
does
not
fire
up,
it
shows
that
the
cause
of
the
111
or
121
error
code
is
something
else.
Continue
with
the
111
or
121
error
code
sections
of
this
guide
for
further
troubleshooting.
“Increase”
button
“Decrease”
button
Red
light
Figure
28
Figure
29