Roberts Gorden UltraVac NEMA 4 - Manual (Page 45)

SECTION 9: T ROUBLESHOOTING
39
Troubleshooting Flow Chart (continued)
Ad
ju
st s
y
st
em f
or pr
oper
vac
uu
m at the end
vent.
See C
ommissioning of the
CR
V
S
y
st
em f
or det
ails
.
W
rong end
vent plat
e
ma
y
b
e inst
alled.
Mak
e s
u
re
plat
e and
bu
rner match.
Is the end
vent
vac
uu
m
set
ting t
oo high?
Ye
s
N
o
R
eplace
bu
rner tr
ansf
o
rmer
.
R
eplace ignition mod
u
le
.
Is ther
e 24
V
at the
bu
rner
tr
ansf
o
rmer secondar
y
(b
lu
e and y
e
llo
w
w
ir
es)?
Ye
s
N
o
Tr
o
ub
leshoot Ends
P
re-p
u
rg
e.
W
ait 45 seconds
.
Do the
bu
rner
s light?
Chec
k LED on mod
u
le and
re
fer t
o
LED codes
b
elo
w
.
Ye
s
N
o
Chec
k f
or pr
oper
vac
uu
m
at end
vent.
See
C
ommissioning of the
CR
V
S
y
st
em f
or det
ails
.
Unpl
u
g
bu
rner
,
w
ait 1
0
seconds
, then pl
u
g it in ag
ain.
Does the ignition mod
u
le
b
egin ignition
se
qu
ence
b
y spar
king?
N
o
Ye
s
R
eplace pl
u
g-in r
ela
y.
See
R
eplacement P
a
rts section.
C
orr
ect g
as pr
o
b
lem.
See
g
as piping section of
CORA
Y
V
AC
®
IOS man
u
al
(P/
N
12
7
1
0
2
N
A)
Is ther
e
pr
oper g
as pr
ess
u
re
and f
lo
w
t
o
the
bu
rner
s?
Ye
s
N
o
V
er
ify
w
ir
ing
b
et
w
een
contr
o
ller and
bu
rn
e
r.
C
ont
act y
o
u
r
R
OBER
TS GORDO
N
®
Independent Distr
ibu
to
r.
N
o
Is ther
e 24
V
ac acr
oss the
contr
o
l
b
oar
d 24
V
o
u
tp
u
t
(#1
-3) f
or that z
one?
N
o
Ye
s
Is ther
e contin
u
it
y acr
oss
met
er inp
u
t #4 (pr
ess
u
re
sw
itch inp
u
t) on the contr
o
l
b
oar
d
?
Do all the
bu
rner
s
ignit
e
smoothl
y?
N
o
N
o
On the r
e
la
y
b
oar
d, is the
appr
opr
iat
e z
one r
e
la
y
(#1
-3) LED lit?
Af
ter 45 seconds pr
e-p
u
rg
e
per
iod, do the
bu
rner
s light?
No
V
er
ify pr
ess
u
re
s
w
itch
w
ir
ing
and oper
ation.
R
eplace
pr
ess
u
re
s
w
itch if necessar
y.
N
o
Is ther
e
po
w
er at the
bu
rner r
ecepticle?
N
o
Ye
s
Is ther
e
24
V
ac acr
oss the
re
la
y
b
oar
d
's appr
opr
iat
e 24
V
o
u
tp
u
t connection (#1
-3)?
Sec
u
re
w
ir
ing
b
et
w
een 24
V
o
u
tp
u
t on the contr
ol
b
oar
d
and o
u
tp
u
t connection on
the r
ela
y
b
oar
d
.
Ye
s
C
ont
act y
o
u
r
R
OBER
TS GORDO
N
®
Independent Distr
ibu
to
r.
Ar
e shield
w
ir
es fr
om R
S-4
8
5
comm
u
nication
w
ir
ing and
V
FD 0-1
0
V
signal
w
ir
ing
corr
ectl
y t
w
ist
ed and/or
gr
o
u
nded?
N
o
Ye
s
Ar
e p
u
mp and/or
bu
rner
s
tu
rning on and of
f err
aticall
y
?
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ignition Module Diagnostic Codes:
LED P
roblem Solution
4 seco
n
d steady
flash at sta
rt of cycle
No
rmal W
ait
fo
r valve to ope
n
S
teady o
n
Mic
rop
rocesso
r fail
ur
e Replace
mod
u
le
withi
n
mod
u
le
Th
ree flashes
Ig
n
itio
n
locko
u
t Recycle
un
it: check fo
r
Locko
u
t of mod
u
le spa
rk a
n
d valve ope
n
in
g a
n
d
afte
r 3 t
ries
replace:if
n
o
n
e,
replace mod
u
le
Ye
s