18
Installation instructions 0020140122_04
7
Maintenance
7.1
Trouble-shooting
7.1.1 Fault diagnosis
The following checks should be performed before proceed-
ing onto specific diagnostics:
– Ensure that the control centre has not been discon-
nected from the electricity supply and that it is connected
correctly.
– Ensure that all installation’s appliances are available.
– Check the functioning of external regulatory devices
(room thermostat(s).
i
The rectification of faults described in this chap-
ter should be carried out by a qualified engineer
and if needed by the After Sales Service.
230V~
CYL.
2
1
DHW
CH1
CH2
ON
DHW
OFF
1
2
-
+
BUS
NTC
2
1
3
Key
1
Fuse
2
Green LED, power supply
3
Red LED flashes, fault
Fault
Possible cause
Solution
Green LED perma-
nently off
No 230 V power
supply or the fuse
in the appliance is
faulty
Check that the main
voltage cable is
connected correctly.
Check the domestic
fuse for the 230 V
supply and re-con-
nect the power
supply. Replace the
main supply fuse in
the control centre
(see technical
data).
Red LED flashes
quickly (2 Hz,
2 flashes/second)
Short circuit of the
connected tempera-
ture sensor (NTC)
in the cylinder
Check the cable of
the temperature
sensor (NTC) for
damage. Replace
the temperature
sensor (NTC) in the
cylinder.
Red LED flashes
slowly (0,5 Hz,
1 flash/ 2 seconds)
Communications
error with the eBUS
boiler.
Check that the boil-
er’s eBUS cable is
connected correctly
and not damaged.
Check that the
boiler is turned on.
Heating zone
valves not operating
Valve disconnected.
Valve doesn’t open.
Check the room
thermostat(s) com-
patibility and con-
nections. Check the
valve connections.
Check the room
thermostat(s) pair-
ing. Ensure that
there is no interrup-
tion to the electricity
supply and that the
control centre is
properly connected
and turned on.
DHW valve not
operating
Fault domestic hot
water cylinder
Cylinder dual ther-
mostat discon-
nected. The tem-
perature sensor is
defective or discon-
nected.
Check the cylinder
dual thermostat and
temperature con-
nections. Check the
sensor’s resistance.
Ensure that there is
no interruption to
the electricity sup-
ply and that the
control centre is
properly connected
and turned on.
7.2
Main supply cable
e
Danger!
>
The main supply cable must be replaced
by a qualified and competent electrician.
>
If the main supply cable is damaged, replace it refering
to the chapter “Electrical connection”.
