Install Instructions
56
EMP
Installation & Service Manual
109529-03 - 11/19
12 Troubleshooting (continued)
C
AU
T
I
O
N
–
A
LW
AYSA
LL
O
W
AB
O
I
L
E
R
T
OCOO
L
B
E
F
O
R
E
ADD
I
N
G
W
A
T
E
R
The burner
will not
fire
until
the
low
water condition
is
s
a
ti
s
fi
e
d.
�
Check that the system
is
filled with
w
a
t
e
r
.
�
Check that the sensor
is
inserted fully into the well and con
t
a
c
t
between
its
spring clip and the copper well tube
is
m
a
d
e
.
�
Check that the control
is
tightly clamped
to
the
w
e
ll
.
The Control i
s
S
e
ns
i
ng
Low
W
a
t
e
r
.
The Boiler
h
a
s
Reached
the
T
a
r
g
e
t
T
e
m
p
e
r
a
t
u
r
e
.
When the ECONOMY function
is
active, the control monitors h
ea
ti
ng
demand and establishes Target boiler temperatures below the
high
limit
setting
to
conserve fuel (see
“
H
o
w
Thermal Targeting
Works” .
The burner
will
not fire until the boiler t
e
m
p
e
r
a
t
u
r
e
drops
to
the automatically calculated Target Temp D
iff
e
r
e
n
ti
a
l
.
Troubleshooting Flow Chart 1 – Burner Will Not Fire
Does the
Display R
ea
d
?
YES
The Control i
s
Purging Latent
Heat
from
the
B
o
il
e
r
.
The Thermal Pre-Purge feature holds off the burner until the
control determines
if
the latent heat
in
the boiler can s
a
ti
s
f
y
the heat
c
a
ll
.
NO
Is
the
Green LED
(TEMP ACTIVE)
NO
O
n?
The Control
is
Not
P
o
w
e
r
e
d.
The Temp Active LED
will
be
on
at all times when the control
is
po
w
e
r
e
d.
�
Check
for
120 VAC on terminals L1 and
L2.
YES
Is
the
Red LED
(
L
O
W
WATER)
O
n?
YES
NO
Is
the
Yellow
LED
(HI
T
E
M
P
)
O
n?
YES
The Control
is
Sensing
High
T
e
m
p
e
r
a
t
u
r
e
.
The burner
will not
fire
until
the boiler water has dropped
to
the
high
limit
differential set-point
(10°
below high
limit
s
e
tti
ng
)
.
�
Check that the high temperature setting
is
co
rr
e
c
t
.
NO
Is
the
Yellow
LED
(
TA
R
G
E
T
)
O
n?
YES
NO
Is
the
T
h
e
r
m
os
t
a
t
(T-T) Calling
NO
for
H
ea
t
?
Is
the
External
Z
on
e
(ZC-ZR) Calling
NO
for
H
ea
t
?
Is
the
Low
Limit
D
i
a
l
Set
to
O
FF
?
YES
When the
low t
e
m
p
e
r
a
t
u
r
e
setting
is
set
to
OFF,
the
HydroStat
will
act as a
cold
start control. The
bu
r
n
e
r
will not
fire unless there
is
a call
from
the t
h
e
r
m
os
t
a
t
(T-T)
or
an external
z
on
e
(
Z
C
-
Z
R
)
.
�
Set thermostat
to
c
a
ll
YES
YES
NO
for
heat. Burner
shou
l
d
fir
e
.
� If
the boiler has a t
a
nk
-
less coil, set the
Low
Temperature
Limit to
maintain t
e
m
p
e
r
a
t
u
r
e
.
Is
T
h
e
r
e
120
VA
C
Between
B
1
and
B
2?
YES
The
C
on
tr
o
l
is
O
p
e
r
a
ti
ng
P
r
op
e
rl
y.
HydroStat
is
supplying 120 VAC
to
the burner
circuit.
�
Recheck wiring and operation
of
burner and other
limit controls.
NO
R
e
p
l
a
c
e
C
on
tr
o
l
If
both the red and yellow LEDs are
off
a
nd
there
is
a call
to
fire the burner, there
will
be
120 VAC
on
terminals B1 and
B
2.
� If
120 VAC
is not
present, the control shou
l
d
be r
e
p
l
a
c
e
d.
Troubleshooting Flow Chart 1 - Burner Will Not Fire