AERCO BMK 2.0 LN Dual Fuel Nov 2010 - Manual (Page 67)

TROUBLESHOOTING
TA
BLE 8-
1. BOILER TR
OUBLESHOOTING – Cont
inued
F
A
U
L
T
IN
D
IC
A
T
ION
P
R
OB
A
B
L
E
C
A
U
S
E
S
T
R
OU
B
L
E
S
H
OOT
IN
G/C
OR
R
E
C
T
IV
E
A
C
T
ION
AIRFLOW
FAULT
DURING PURGE
1.
Blow
er
not r
unning or
r
unning too s
low
2.
Def
e
c
tive Air
F
low
Sw
itc
h
3.
Bloc
k
ed Air
f
low
Sw
itc
h
4.
Bloc
k
ed Blow
er
inlet or
inlet duc
tw
or
k
.
5.
No voltage to s
w
itc
h f
rom
c
ontr
ol box
.
6.
PRO
B
A
B
LE CA
USES
f
rom
3 to 12
fo
r
A
IRFLOW
FA
ULT
DURING
IG
NIT
IO
N
applies
f
o
r this
f
ault
1.
Star
t the unit. If
the blow
er
does
not r
un c
hec
k
the blow
er
s
olid
s
tate
relay
f
or
input and output voltage. If
the r
elay
is
ok
ay
, c
hec
k
the blow
er
.
2.
Star
t the unit. If
the blow
er
r
uns
, c
hec
k
the
air
flow
s
w
itc
h
for
c
ontinuity
. Replac
e the s
w
itc
h if
ther
e is
no c
ontinuity
.
3.
Rem
ove
the
air
fl
ow
s
w
itc
h and ins
pec
t f
or
s
igns
of
bloc
k
age,
c
lean or
r
eplac
e as
nec
es
s
ar
y
.
4.
Ins
pec
t
the
inlet
to the c
om
bus
tion blow
er
inc
luding any
duc
tw
or
k
leading up to the c
om
bus
tion blow
er
f
or
s
igns
of
bloc
k
age.
5.
Meas
ur
e f
or
24 VAC dur
ing s
tar
t s
equenc
e f
rom
eac
h s
ide of
the
s
w
itc
h to gr
ound. If
24VAC is
not
pr
es
ent
ref
er
to
qualif
ied
s
e
rv
ic
e per
s
onnel.
6.
See
CO
RRECT
IVE A
CT
IO
N
f
rom
3 to 12
for
A
IRFLOW
FA
ULT
DURING IGNIT
ION
AIRFLOW
FAULT
DURING RUN
1.
Blow
er
s
topped r
unning due to ther
m
al
or
c
ur
rent over
load
2.
Bloc
k
ed Blow
er
inlet or
inlet duc
tw
or
k
3.
Bloc
k
ed air
flow
s
w
itc
h
4.
Def
e
c
tive air
flow
s
w
itc
h
5.
C
o
m
bus
tion
os
c
illations
6.
PRO
B
A
B
LE CA
USES
f
rom
3 to 16
fo
r
A
IRFLOW
FA
ULT
DURING
IG
NIT
IO
N
applies
f
o
r this
f
ault
1.
Chec
k
c
om
bus
tion
blow
er
for
s
igns
of
ex
c
es
s
ive heat or
high
c
ur
rent dr
aw
that m
ay
tr
ip ther
m
al or
c
ur
rent over
load devic
es
.
2.
Ins
pec
t
the
inlet
to the c
om
bus
tion blow
er
inc
luding any
duc
tw
or
k
leading up to the c
om
bus
tion blow
er
f
or
s
igns
of
bloc
k
age.
3.
Rem
ove the air
flow
s
w
itc
h and ins
pec
t
for
s
igns
of
bloc
k
age,
c
lean or
r
eplac
e as
nec
es
s
ar
y
.
4.
Meas
ur
e the air
flow
s
w
itc
h f
or
c
ontinuity
w
ith
the
c
om
bus
tion
blow
er
running. If
ther
e is
an er
ratic
r
es
is
tanc
e r
eading or
the
res
is
tanc
e r
eading is
gr
eater
than z
er
o ohm
s
, r
eplac
e the s
w
itc
h.
5.
Run
unit to f
ull f
ir
e. If
the unit r
um
bles
or
r
uns
r
ough, per
for
m
c
o
m
bus
tion c
a
libr
a
tion.
6.
PRO
B
A
B
LE CA
USES
f
rom
3 to 16
for
A
IRFLOW FA
ULT
DURING IGNIT
ION
applies
f
o
r this
f
ault
8
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3