Troubleshooting
Guide
10|
Page
UNIT
DOES
NOT
IGNITE
WHEN
WATER
GOES
THROUGH
IT
•
Is
the
flow
rate
over
0.75
gpm?
See
if
the
unit
initiates
when
you
increase
demand
of
water
being
drawn
through
the
unit
(e.g.
opening
up
more
hot
fixtures).
•
Check
that
the
gas
line
is
open
and
is
purged
of
air
(p.
22).
•
Check
that
the
filter
on
the
cold
water
inlet
is
clean
(p.
21).
•
Check
for
reverse
connection
and
cross
connection
(p.
21).
•
Problems
with
recirculation
system
o
See
that
a
check
valve
is
installed
between
the
pump
discharge
and
the
connection
to
the
cold
water
supply.
A
malfunctioning
or
missing
check
valve
will
cause
cold
water
to
back
‐
feed
into
the
system.
•
If
you
use
the
remote
controller,
is
the
remote
power
button
turned
on?
•
Check
to
see
if
the
Computer
board
is
receiving
power.
This
can
be
verified
by
observing
the
computer
board
red
LED.
o
If
it
is
not
lit,
the
computer
board
is
not
being
powered.
Check
to
see
if
the
ON/OFF
switch
below
the
fuse
box
is
set
to
the
on
position,
or
if
the
fuse
in
the
fuse
box
is
blown.
•
If
the
fan
does
not
initiate
at
all
and
it
is
verified
that
the
unit
is
powered(see
above),
the
flow
sensor
may
not
be
working
properly.
Check
the
flow
sensor
for
proper
impeller
functionality.
IT
TAKES
A
LONG
TIME
TO
GET
HOT
WATER
AT
THE
FIXTURES
•
The
time
it
takes
to
deliver
hot
water
to
your
fixtures
depends
on
the
length
of
piping
between
the
two.
The
longer
the
distance
or
the
bigger
the
pipes,
the
longer
it
will
take
to
get
hot
water.
If
this
is
the
case
and
you
would
like
to
receive
hot
water
to
your
fixtures
quicker,
you
may
want
to
consider
a
hot
water
recirculation
system.
•
Problems
with
the
recirculation
system.
o
See
that
a
check
valve
is
installed
between
the
pump
discharge
and
the
connection
to
the
cold
water
supply.
A
malfunctioning
or
missing
check
valve
will
cause
cold
water
to
back
‐
feed
into
the
system.
THE
FAN
MOTOR
IS
STILL
SPINNING
AFTER
OPERATION
HAS
STOPPED
•
This
is
normal.
After
operation
has
stopped,
the
fan
motor
keeps
running
from
5
to
50
seconds
in
order
to
re
‐
ignite
quickly,
as
well
as
purge
all
the
exhaust
gas
out
of
the
flue.
ABNORMAL
SOUNDS
COME
FROM
THE
UNIT
•
Check
the
fan
for
debris.
•
Contact
the
Technical
Service
Department.
LOSS
OF
PRESSURE
AT
ALL
SINKS
DURING
COMMERCIAL
DISHWASHER
FILLS
•
Verify
the
capacity
of
the
heater(s)
versus
the
GPM
demand
of
the
dishwasher.
•
Check
the
size
of
the
supply
lines
to
the
dishwasher.
•
Look
for
a
water
regulator
on
the
dishwasher.
Check
the
dishwasher
rating
plate
to
confirm
the
recommended
supply
water
pressure.
•
Unit
may
be
hard
water
scaled.
Scale
can
reduce
pressure
and
flow
of
water
through
the
unit;
this
can
occur
as
quickly
as
a
few
months.
Figure
3
