Watts AERCO Benchmark 2.0, User Manual

Page: 62 / 97

TROUBLESHO
OTING
8
-6
TABLE 8-1. BOILER TRO
UBLESHOOTING – Contin
ued
FAULT INDI
CATION
PROBABL
E CAU
SES
CORRECTI
VE ACTI
O
N
IGN SWT
CH
CLOSE
D
DU
RIN
G
PU
RGE
1.
Air/Fuel Valve not rotating
2.
Defe
ctive or shorted
swit
ch
3.
Switch wi
re
d inco
rrectly
4.
Defe
ctive Power Su
pply Board o
r
fus
e
5.
Defe
ctive IGST Board
1.
Start the unit. The Air/Fuel
Valve shoul
d rotate to the purg
e
(ope
n) p
ositio
n. If
the valve does n
ot rota
te at all or does not
rotate fully open, che
ck the
Air/Fuel Valve calib
ration.
If
calib
ration i
s okay, the pro
blem may be
in the Air-Fu
el Valve or
the Control Box. Refer to q
ualified service person
nel
2.
. If the Air/Fuel Valve does rotate to purge, che
ck the
ignition
swit
ch for
con
tinuity betwee
n the N.O. an
d COM termi
nals. If the
swit
ch sho
w
s continuity wh
en not in co
ntact with the cam
repla
ce the
switch.
3.
Che
ck to ensure that the switch i
s wired
corre
ctly (co
rrect
wire
numbe
rs on the normally o
pen termi
nal
s). If the switch is wired
corre
ctly, repl
ace the
swit
ch
4.
Che
ck DS1 &
DS2 LEDs o
n Powe
r Sup
ply Board. If they are not
steady O
N
, repla
ce Power Supply Board.
5.
Che
ck “Hea
rtbeat” LE
D DS1 and verify it is blinkin
g ON & OFF
every se
con
d.
If not, replace IGST Board
IGN SWT
CH
OPEN
DU
RIN
G
IGN
ITION
1.
Air/Fuel Valve not rotating
to ignition
positio
n.
2.
Defe
ctive igni
tion swit
ch
3.
Defe
ctive Power Su
pply Board o
r
fus
e
4.
Defe
ctive IGST Board
1.
Start the unit. The Air/Fuel
Valve shoul
d rotate to the purg
e
(ope
n) p
ositio
n, then back to ignition po
si
tion (towa
rd
s
clo
sed
)
durin
g the ign
ition cycle. If the valve doe
s not rotate b
ack to the
ignition po
sition, che
ck the
Air/Fuel Valve calib
ration.
If
calib
ration i
s okay, the pro
blem may be
in the Air/Fue
l Valve or
the Control Box. Refer faul
t to qualified servi
ce pe
rso
nnel.
2.
If the Air/Fuel Valve does rotate to the ignition po
sition
, check
the ignition p
osition
swit
ch
for continuity
betwee
n the N.O. and
COM terminals
when in contac
t with the c
am.
3.
Che
ck DS1 &
DS2 LEDs o
n Powe
r Sup
ply Board. If they are not
steady O
N
, repla
ce Power Supply Board.
4.
Che
ck “Hea
rtbeat” LE
D DS1 and verify it is blinkin
g ON & OFF
every se
con
d.
If not, replace IGST Board
.
INTERLOCK
OPEN
1.
Interlock jum
per not in
stall
ed or
re
mo
ved
2.
Energy Man
agement Syste
m
does
not have boil
er ena
bled.
3.
Device provin
g swit
ch ho
oked to
interloc
ks
is
not c
losed.
1.
Che
ck for a jumpe
r pro
pe
rly installed a
cross the inte
rlock
terminal
s in the I/O box
2.
If there are two external wi
res on the
se t
ermin
als
che
ck a
ny
Energy Man
agement sy
ste
m
to
see if they have the units
disa
bled (a ju
mper may be
temporarily in
stalled to see
if the
interloc
k
ci
rc
uit is
func
tioning).
3.
Che
ck that proving switch
fo
r any device
hooked to the
int
erlo
ck
circuit is
closi
ng and that th
e device i
s op
eration
al.