Troubleshooting
Guide
21|
Page
DRAINING
THE
UNIT:
1)
Close
the
manual
gas
shut
off
valve.
2)
Turn
off
power
to
the
unit,
and
then
turn
on
again.
3)
Wait
30
seconds,
and
then
turn
off
power
to
the
unit,
yet
again.
4)
Close
the
cold
water
inlet
shutoff
valve.
5)
Open
all
hot
water
taps
in
the
house,
or
open
the
pressure
‐
relief
valve
to
remove
the
initial
pressure.
When
the
residual
water
flow
has
ceased,
close
all
hot
water
taps.
6)
Unscrew
the
drain
plugs
(hot
water
outlet
drain
plug
and
cold
water
inlet
filter)
to
drain
the
remaining
water
out
of
the
unit.
Have
a
bucket
or
pan
to
catch
the
water
from
the
unit’s
drain
plugs.
Wait
a
few
minutes
to
ensure
all
water
has
completely
drained
from
unit.
CLEANING
THE
FILTER:
1)
Drain
the
unit
(procedure
above).
2)
Check
the
water
filter
located
within
the
cold
inlet.
With
a
tiny
brush,
clean
the
water
filter
of
any
debris
which
may
have
accumulated
and
reinsert
the
filter
back
into
the
cold
water
inlet.
3)
Securely
screw
the
filter
back
into
place.
Hand
‐
tighten
only.
CHECKING
FOR
A
CROSS
CONNECTION:
1)
Turn
off
cold
water
supply.
2)
Turn
on
all
hot
water
fixtures.
a.
The
water
should
eventually
completely
drain.
b.
If
water
continues
to
run,
the
fixtures
and
plumbing
system
needs
to
be
checked.
c.
Cold
water
cross
connections
may
be
related
to
a
recirculation
pump
application,
a
bad
check
valve,
or
missing
check
valve
in
the
application.
CHECK
FOR
REVERSE
CONNECTION:
1)
Close
cold
water
supply
at
the
inlet.
2)
Open
the
pressure
‐
relief
valve;
it
should
be
installed
on
the
hot
side
outlet
of
the
unit.
3)
If
water
continues
to
run
through
the
pressure
‐
relief
valve,
the
system
has
a
reverse
connection.
CHECK
GAS
SUPPLY
PRESSURE:
1)
Close
the
manual
gas
inlet
shut
off
valve
on
the
gas
supply
line.
2)
Open
a
faucet.
The
unit
should
turn
on
and
the
gas
in
the
pipe
line
should
purge.
Leave
the
faucet
on
to
keep
the
unit
running
until
it
shuts
down
due
to
lack
of
gas,
and
then
shut
the
faucet
off.
Ignore
any
error
codes
that
may
occur
at
this
time.
3)
Remove
the
screw
for
the
pressure
port
located
on
the
gas
inlet
shown
on
the
right.
4)
Connect
a
manometer
to
the
pressure
port.
Figure
17
Figure
18
