Install Instructions
CG
i
GAS-FIRED
wATER
BOILER-
sERIEs
a-
Boiler
Manual
llc
Troubleshooting - control module lights (cont.)
CHART
7-
lnsuff1c1ent heat
or
no heat to system (POWER light on steady)
I&
WARNING
I
Electrical shock hazard - Wherever you see & TURN OFF
POWER&
, follow the instructions. Failure to follow
instructions
co
uld resuk in severe personal injury, death,
or
substanti
al
property damage.
.
Has
~
been
at
least 5
mi
nutes since setting thermostat to
-
ca
ll for heat?
If
not, wait 5
mi
nutes. Is system
he
ating?
.
Is thermostat set to call for heat? Remove thermostat
wires at
bo
iler and check continui
ty
across the
two
wires.
If
c
i
rc
u~
isn1 closed, check e
xt
ernal thermostat (zone
val
ve,
relay, etc.) wiring. Correct probl
ems
and retry.
.
Reconnect
ex
te
rnal thermostat wiring at
bo
iler.
Is thermostat circuit
dosed
(continuity across wires)?
No
I I
Yes
I--
•
IAre all red lig
ht
s off?
.
Boil
er
is in standby .
0 es
_?
:
Set thermostat to call
for
heat and recheck
wa
n
JU
seconas. operati
on
.
Are
all red lig
ht
s off? Ve
ri
fy Sequence
of
NO
I
Yes
operati
on
,
Fig
ure
30
,
•
page38
.
Replace con
tr
ol module.l
Re
test.
.
If you have sufficient heat boiler should be in normal
operating sequence.
(See normal sequence
of
operat
io
n,
~
Fig
ure
30
, page
39
.)
.
.
.
.
.
60
If you have less than sufficient heat -
Is vent oioina free
of
blockaae?
No
I I
Yes
Correct conditions and
Is man
if
old pressu
re
:
recheck operatio
n.
See
Figu
re 30, page
38
f
or
normal sequence of
operatio
n.
Check heat loss
ca
lculation
ve
rsus boil
er
si
ze
.
...
Cl
ock
gas input .
3.50" w.c.
on
natural gas?
10.0" w.c.
on
propane?
Yes
II
No
I .
r
Replace t
imer
relay .
(CGi-4
Only)
Replace temperat
ur
e
se
n
so
r.
Retes
t.
Is boiler System circulator operating?
No
I
Yes
+
.
Remove CIRCULATOR ha
rn
ess plug from
CIRCULATOR plug receptacle
(Figure
38, trem
7,
page 53). Check
w~
vo
lt
me
ter across
pi
ns
of
control module receptacle.
Does voltmeter
show
120 VAC across pins?
No
I
Yes
t
~
.
Replace control
.
Repairtreplace
module. circulator. Retes
t.
.
Retes
t.
.
Repair
tr
eplace
wiring. Retes
t.
.
Wa
~
5 minutes .
Is FLAME li
ght
on?
Yes
I
No
L
Is
LIM
IT light on?
No
I
Yes
+
.
Check
te
mpe
ra
ture
.
Replace control module .
sensor
for
correct
.
Re
te
st.
resistance.
Are
resistance values
correct?
II
Check ro
ll
out
switch
No
Yes
continuity -
is
switch
closed?
Yes
• Replace rollo
ut
sw
~
c
h.
If
rollout ther
ma
l fuse element has
opened, determine cause and
correct condition. Failure to
do
so
will
ca
u
se
severe personal injury,
death
or
substantial property
damage.
Check any oth
er
limit controls
wi
r
ed
into the limit
circ
uit
If
all are
OK, t
he
n replace
con
tr
ol module.
Re
tes
t.
Part Number 550
-14
2-780/0712