AERCO BMK 2.0 LN Dual Fuel Nov 2010 - Manual (Page 71)

TROUBLESHOOTING
TA
BLE 8-
1. BOILER TR
OUBLESHOOTING – Cont
inued
FA
ULT
I
NDI
CA
T
IO
N
PRO
B
A
B
LE CA
USES
T
R
OU
B
L
E
S
H
OOT
IN
G/C
OR
R
E
C
T
IV
E
A
C
T
ION
IGN SW
T
CH CLOSED
DURING PURGE
1.
Air
/F
uel Valve not r
o
tating
2.
Def
ec
tive or
s
hor
ted s
w
itc
h
3
.
S
w
it
ch
w
ire
d
i
n
co
rre
ct
ly
4.
Def
e
c
tive Pow
e
r Supply
Boar
d or
fu
s
e
5.
Def
ec
tive IG
ST
Boar
d
1.
Star
t the unit. T
he Air
/F
uel Valve s
hould r
otate to the pur
ge
(open)
pos
ition. If
the valve does
not r
otate at all or
does
not
rotate f
ully
open, c
hec
k
the Air
/F
uel Valve c
alibr
ation. If
c
a
libr
a
tion is
ok
ay
, the pr
oblem
m
a
y
be in the Air
-F
uel Valve or
the Contr
ol Box
. Ref
er
to qualif
ied s
er
v
ic
e per
s
onnel
2.
. If
the Air
/F
uel Valve does
r
o
tate to pur
ge, c
hec
k
the ignition
s
w
itc
h f
or
c
ontinuity
betw
een the N.O
. and CO
M ter
m
inals
. If
the
s
w
itc
h s
how
s
c
ontinuity
w
hen not in c
ontac
t w
ith the c
am
r
eplac
e
th
e
sw
it
ch
.
3.
Chec
k
to ens
ur
e that the s
w
itc
h is
w
ir
ed c
or
rec
tly
(
c
or
rec
t w
ir
e
num
ber
s
on the nor
m
ally
open ter
m
inals
). If
the s
w
itc
h is
w
ir
ed
c
or
rec
tly
, r
eplac
e the s
w
itc
h
4.
Chec
k
DS1 & DS2 LEDs
on Pow
er
Supply
Boar
d. If
they
ar
e not
s
teady
O
N
, r
eplac
e Pow
er
Supply
Boar
d.
5.
Chec
k
“
H
ear
tbeat”
LED DS1 and ver
if
y
it is
blink
ing O
N
& O
F
F
ever
y
s
ec
ond. If
not, r
eplac
e IG
ST
Boar
d
IGN SW
T
CH OPEN
DURING IGNIT
ION
1.
Air
/F
uel Valve not
rotating to ignition
pos
ition.
2.
Def
e
c
tive ignition s
w
itc
h
3.
Def
e
c
tive Pow
e
r Supply
Boar
d or
fu
s
e
4.
Def
ec
tive IG
ST
Boar
d
1.
Star
t
the unit. T
he Air
/F
uel Valve s
hould r
otate to the pur
ge
(open)
pos
ition,
then
bac
k
to ignition pos
ition (
tow
ar
ds
c
los
ed)
dur
ing the ignition c
y
c
le. If
the valve does
not
rotate
bac
k
to
the
ignition
pos
ition, c
hec
k
the Air
/F
uel Valve c
a
libr
a
tion. If
c
a
libr
a
tion is
ok
ay
, the pr
oblem
m
a
y
be in the Air
/F
uel Valve or
the Contr
ol Box
. Ref
er
f
ault to qualif
ied s
er
v
ic
e per
s
onnel.
2.
If
the Air
/F
uel Valve does
r
otate
to the ignition pos
ition,
c
hec
k
the
ignition pos
ition s
w
itc
h f
or
c
ontinuity
betw
een the N.O
. and CO
M
ter
m
inals
w
hen in c
ontac
t w
ith the c
am
.
3.
Chec
k
DS1 & DS2 LEDs
on Pow
er
Supply
Boar
d. If
they
ar
e not
s
teady
O
N
, r
eplac
e Pow
er
Supply
Boar
d.
4.
Chec
k
“
H
ear
tbeat”
LED DS1 and ver
if
y
it is
blink
ing O
N
& O
F
F
ever
y
s
ec
ond. If
not, r
eplac
e IG
ST
Boar
d.
INT
E
RLO
C
K
O
PEN
1.
Inter
loc
k
j
um
per
not ins
talled or
re
m
o
ved
2.
Ener
gy
Managem
ent Sy
s
tem
does
not have boiler
enabled.
3.
Devic
e pr
oving s
w
itc
h hook
ed to
inter
loc
k
s
is
not c
los
ed.
1.
Chec
k
f
or
a j
um
per
pr
oper
ly
ins
talled ac
ros
s
the inter
loc
k
ter
m
inals
in the I/O
box
2.
If
ther
e ar
e tw
o ex
ter
nal w
ir
es
on thes
e ter
m
inals
c
hec
k
any
Ener
gy
Managem
ent s
y
s
tem
to s
ee if
they
have the units
dis
abled (
a j
um
per
m
ay
be tem
por
ar
ily
ins
talled to s
ee if
the
inter
loc
k
c
ir
c
uit is
f
unc
tioning)
.
3.
Chec
k
that pr
oving s
w
itc
h f
or
any
devic
e hook
ed to the inter
loc
k
c
ir
c
uit is
c
los
ing and that the devic
e is
oper
ational.
8
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