47
10 FAULT FINDING
10.1 Fault finding table
Follow the procedure below in the given order:
1
No number appears on the boiler
display
Check:
- the supply voltage 230 V
- the fuses in the control unit
2
If a failure code is shown on the
boiler display
- Yes, go to
Par. 10.2
- No, go to 3
3
Check the operating mode of the
boiler
(see Par. 9.2.4)
- ‘0’ (no heat demand): go to 4
-
1
-
9
,
H
or
L
: locate the fault with the
aid of the given operating mode
4
Boiler will not start (without failure
signal)
Check the room thermostat. It may be
defective or not properly connected or set.
The boiler also does not go into operation if
the flow- or return temperature is too high,
otherwise go to 7.
5
Boiler will operate for CH but not
for DHW
Check temperature sensor on plate heat
exchanger (
combi boiler only
).
6
Boiler will only operate for DHW
but not for CH
Check temperature sensor on plate heat
exchanger (
combi boiler only
).
7
Remove the front casing and
check the operation of the boiler
by connecting a bridging wire to
the 6 way connector X4
(see Fig.
16)
between terminals 2 and 3
(Tk).
Is the boiler going into operation?
- Yes, check the controller settings.
- No, verify whether the flow- or return tem-
perature is too high.
- Check the wiring and connections.
- Check the control unit settings. If the
boiler is still not working, check the con-
trol unit (you can do this by temporarily
installing a replacement control unit).
Table 10 Fault finding table in case of modulating room thermostat and on/off room
thermostat
10.2 Fault codes
In the event of a fault, two numbers will flash alternately in the window, and the latter number
will be accompanied by an illuminated red dot. For an explanation of the various failure
codes and their possible causes, please refer to the following failure table,
see Table 11.
Important:
Before resetting the boiler, make a precise note of the failure code (numbers, includ-
ing flashing/illuminating red dot) and always quote the relevant code when asking for
support. The failure code is important for finding out the nature of the fault. The failure
code can be read with the aid of the service tool.
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