SECTION 18: T
ROUBLESHOOTING
81 of 91
Chec
k
ther
most
at w
ir
ing
for shor
ts and r
eplace
ther
most
at if necessar
y.
R
eplace main contr
ol
b
oar
d.
(P/
N
90437500)
C
o
nt
act R
apid Engineer
ing LLC
at
www
.r
apidengineer
ing
.com
Do
b
ur
ner
s shut of
f af
te
r
the call f
o
r heat is
satisf
ied?
Mak
e sur
e that all
ther
most
ats (including
Smar
tSet and
N
ight Set
Bac
k) ar
e est
a
b
lished.
W
ith the ther
most
ats
connect
ed, measur
e
the
v
olt
age
b
et
w
een the
ther
most
at t
e
rminals
(T1, T2, T3, T4,
SCT
and
N
S
T
) and the COM
te
rminal.
Ar
e all the
v
olt
ages 5
V
.
Does the pump shut
do
wn
af
te
r a 45 second
post-pur
ge per
iod?
Mak
e sur
e
that all
ther
most
ats (including
Smar
tSet and
N
ight Set
Bac
k) ar
e satisf
ied.
Disconnect all
ther
most
at w
ir
es fr
om
COM.
Does the pump
contin
ue t
o
r
un af
ter a
45 sec.
post-pur
ge
per
iod?
R
econnect ther
most
a
t
w
ir
e
s
. Disconnect
W
1
w
ir
e
fr
om pump r
ela
y.
Does the pump still r
un?
R
e
place pump r
e
la
y.
(P/
N
90437900, Omr
on
G4B-1
1
2T1
-US
, or
e
q
ui
v
alent)
Tr
o
u
b
leshoot ends
.
If pr
o
b
lem per
sists
,
cont
act y
our local
RAPID™
R
epr
esent
ati
v
e.
R
eplace main contr
ol
b
oar
d
.
(P/
N
90437500)
N
oY
e
s
Ye
s
N
o Y
e
s
Y
es
Y
e
s
N
o
N
o
N
o
Ye
s
Ye
s
Ye
s
Is the contin
uit
y
of the
ear
th w
ir
e
est
a
b
lished?
Is the insulation on the
ignit
er/sensor leads OK?
Ignition module ma
y ha
v
e
failed.
R
eplace module
.
(P/
N
90434002K)
Ye
s
Y
e
s
N
o
N
o
Does the
b
ur
ner st
a
y
on?
R
e
-E
st
a
b
lish C
ontin
u
it
y.
R
e-E
st
a
b
lish C
ontin
uit
y.
Do all the
b
ur
ner
s
ignit
e smoothl
y?
Is the
v
acuum set
ting
to
high?
A
djust s
y
s
tem f
or
pr
oper
v
acuum.
See
v
enting section f
or
det
ails
.
N
o
N
oY
e
s
Ye
s
N
o
Ye
s
