Watts AERCO Benchmark 2.0, User Manual

Page: 64 / 97

TROUBLESHO
OTING
8
-8
TABLE 8-1. BOILER TRO
UBLESHOOTING – Contin
ued
FAULT INDI
CATION
PROBABL
E CAU
SES
CORRECTI
VE ACTI
O
N
contin
ued
5.
Defe
ctive IGST Board
5.
Che
ck “Hea
rt
beat” LE
D DS1 and verify it is blinkin
g ON & OFF
every se
con
d.
If not, replace IGST Board
.
PRG SWTCH OPEN
DU
RIN
G
PU
RGE
1.
Defe
ctive purge switch.
2.
No voltage p
rese
nt at switch.
3.
Switch wi
re
d inco
rrectly.
4.
Defe
ctive Power Su
pply Board o
r
fus
e
5.
Defe
ctive IGST Board
1.
If the air-fuel valve does ro
tate, check th
e purg
e switch for
contin
uity wh
en clo
sin
g. Repla
ce switch
if continuity does n
ot
exis
t.
2.
Measure for 24 VAC from
each sid
e of the switch to g
roun
d. If
24VAC is n
ot pre
sent, refe
r fault to qualified se
rvice p
ersonn
el.
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).
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
.
OUT
D
O
O
R T
E
MP
SENSOR FA
ULT
1.
Loo
se or b
ro
ken wiri
ng.
2.
Defe
ctive Senso
r.
3. Inc
orrec
t Sens
or.
1.
Inspe
ct Outd
oor Te
mpe
rat
ure sen
so
r for loose or b
ro
ken
wirin
g.
2.
Che
ck re
sista
nce of sen
sor to determine
if it is within
specification.
3.
Ensu
re that the co
rrect se
nso
r is in
stall
ed.
REMOTE SETPT
SIGNAL FAULT
1.
Remote
setp
oint sign
al no
t prese
nt:
Not yet install
ed.
Wrong pol
arit
y.
Signal defe
ctive at source.
Broken or lo
os
e wi
ring.
2.
Signal is not i
solate
d (floati
ng) if 4 to
20 mA.
3.
Control Box signal type sel
ection
swit
che
s not
set for corre
ct signal
type (voltage or cu
rrent).
1.
Che
ck I/O Box to ensure
si
gnal is h
oo
ke
d up.
Hoo
k up if no
t installed.
If installed, ch
eck pola
rity.
Measure sig
na
l level.
Che
ck co
ntin
uity of wiring
betwe
en source an
d boile
r.
2.
Che
ck sig
nal
at source to e
nsu
re it is isol
ated.
3.
Check
DIP switc
h on PMC board to ens
ure it is
s
et correc
tly for
the type of signal bei
ng se
nt. Check co
ntrol sig
nal type set in
Config
uratio
n Menu.
RESIDUAL
FLAME
1.
SSOV not fully close
d.
1.
Che
ck ope
n/clos
e in
dicator windo
w of Safety Shut-Off Valve
(SSOV) an
d ensure that th
e SSOV
is
fully c
los
ed. If n
ot fully
clo
sed, re
pla
ce the valve and or a
ctuat
or.
Clo
se ga
s sh
ut-off valve down
stre
am of
SSOV. Install a
manom
eter o
r gaug
e in a g
as test po
rt b
etwee
n the SSOV and
the gas
shut
off valve.
If a
gas p
re
ssure readi
ng is o
bserve
d
repla
ce the S
S
OV valve and or act
uator.