4
H
ow
to
Use
Th
i
s
Man
u
a
l
I
t
is
intended
for
this
manua
l
to
be
used
by
qua
l
ified
service
personne
l
for
the
primary
purpose
of
troub
l
eshooting
ana
l
ysis
and
repair
of
the
Bradford
White
UCG100H399
.
Understanding
the
sequence
of
operation
section
of
this
manua
l
wi
ll
contribute
great
l
y
to
troub
l
eshooting
this
product
.
An
“I
nsta
ll
ation
Check
List
”
is
shown
towards
the
end
of
this
manua
l.
Compare
the
insta
ll
ation
against
the
insta
ll
ation
check
l
ist
to
confirm
a
ll
requirements
are
met
.
A
“
Service
Report
”
is
shown
towards
the
end
of
this
manua
l.
Comp
l
eting
this
form
wi
ll
assist
in
the
troub
l
eshooting
efforts
.
Shou
l
d
you
need
to
ca
ll
for
technica
l
support
,
p
l
ease
provide
the
information
shown
on
this
form
to
the
support
technician
to
he
l
p
ensure
accurate
troub
l
eshooting
.
T
roub
l
eshooting
begins
with
“
System
Observation
”
to
determine
fai
l
ure
mode
as
indicated
by
the
error
code
on
the
system
disp
l
ay
. T
roub
l
eshooting
continues
with
“F
ai
l
ure
Modes
and
Probab
l
e
Cause
”
directing
the
service
provider
to
a
series
of
test
procedures
to
determine
root
cause
of
fai
l
ure
.
Component
rep
l
acement
procedures
direct
l
y
fo
ll
ow
the
test
procedures
for
a
given
component
.
I
n
some
difficu
l
t
to
diagnose
conditions
,
it
may
be
necessary
to
iso
l
ate
the
heater
from
the
vent
system
to
determine
root
cause
.
Contact
T
echnica
l
support
immediate
l
y
if
diagnosis
is
not
determined
using
the
methods
described
in
this
service
manua
l.
Too
l
s
Re
qui
re
d
for
Ser
vi
ce
Manometer:
T
wo
types
avai
l
ab
l
e
,
a
l
iquid
“
U
”
tube
type
or
a
digita
l (
magna
-
he
l
ic
)
type
. T
his
device
is
used
to
measure
gas
and
/
or
air
pressures
and
vacuum
.
Mu
l
ti
-
Meter:
A
digita
l
type
is
strong
l
y
recommended
. T
his
device
is
used
to
measure
e
l
ectrica
l
va
l
ues
. T
he
meter
you
se
l
ect
must
have
the
capabi
l
ity
to
measure
vo
l
ts
AC
,
vo
l
ts
DC
,
Amps
,
micro
-
amps
and
ohms
.
T
hermometer:
Used
to
measure
water
temperature
.
An
accurate
thermometer
is
recommended
.
Water
Pressure
Gage:
Used
to
measure
water
supp
l
y
pressure
.
A
l
so
used
to
determine
tank
pressure
by
adapting
to
the
drain
va
l
ve
of
the
heater
.
J
umper
Leads:
A
l
ength
of
wire
(
12
"
min
.)
with
a
ll
igator
c
l
ip
at
both
ends
.
Various
Hand
T
oo
l
s:
Pipe
wrench
,
channe
l l
ocks
,
open
end
wrench
set
,
12
"
crescent
wrench
,
A
ll
en
wrench
set
,
tor
x
bit
set
,
screw
drivers
(
common
&
phi
ll
ips
), l
ong
reach
(
12
")
magnetic
tip
phi
ll
ips
head
screw
driver
#
2
tip
, ¼"
nut
driver
,
p
l
iers
(
common
&
need
l
e
nose
),
socket
set
inc
l
uding
a
1
-
1
/
16
deep
we
ll
socket
,
wire
cutters
,
wire
strippers
,
wire
crimpers
,
torpedo
l
eve
l,
sma
ll
shop
vac
,
step
l
adder
,
and
f
l
ash
l
ight
.
4
