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Reason
Cause:
The circuit connected to the general blocking terminals is not closed.
Corrective Action:
Check all external safety devices that are in the circuit connected to the general blocking terminals, and determine why the
contact is not closed during heat demand.
Display message
Reason
Cause:
The unit is programmed in such a way that none of the boilers in a cascade will fire, if one has a lockout. One unit has a
lockout and therefore the whole cascade is blocked.
Corrective Action:
Troubleshoot the fault with the locked-out boiler.
17.3
IMPORTANT MESSAGES
The following graphs describe the messages at the boiler display. Depending on the selected and activated
options for the boiler, it is possible that some messages will show up at the display of the boiler. For example a
maintenance message after a certain programmed date has been reached. The boiler will operate independently
of these messages.
Display message
Reason
Display message
Reason
Display message
Reason
Display message
Reason
18.0
USER INSTRUCTIONS
Once the installation and commissioning is complete, the equipment owner or their representative should be made
aware of the operation of the appliance and its safety devices. A practical demonstration should be given
describing each functional step. Incorrect use may result in injury and will also invalidate the warranty. The
installers guide should be handed over and kept in a safe place for easy reference. It is strongly recommended
that the users read and understand the separate User Guide.
G e n
B
l
o
c
k
The general blocking circuit is activated during operation (after a flame was rectified).
C
a
s
c
a d
e
B
Connection failure with one of the boilers of the cascade.
N
e
e d
s
M
a
i
I
g
n
i
t
i
o
n
Maintenance option of total amount of ignition cycles has been reached.
N
e
e d
s
M
a
i
D
a
t
e
Maintenance option of the date has been reached.
N
e
e d
s
M
a
i
B u
r
n
i
n
g
h
Maintenance option of total amount of burning hours has been reached.
N
e
e d
s
M
a
i
A
l
l
One of the all selected maintenance options has been reached.
9
9
9
,
5
h
l
o
c
k
9
9
9
,
5
h
n
t
e n
a n
0
c
y
c
l
e
s
h
r
n
t
e n
a n
0
h
r
n
t
e n
a n
0
o
u
r
s
h
r
n
t
e n
a n
0
h
r
r
s
r
s
.
0
s
.
0
s
.
0
s
.
0
s
91
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