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0020140122_02 - 05/13
MAINTENANCE
EN
6 User information
At the end of the installation, the installer must:
- explain the operation of the appliance and its safety devices to
the user, if necessary provide a demonstration and answer any
questions;
- give the user all the required documentation,
- fi ll in the documents where necessary;
- advise the user of the precautions necessary to prevent
damage to the system, appliance and the building;
- remind the user to service the appliance annually.
7 Maintenance
7.1 Trouble-shooting
7.1.1 Fault diagnosis
The following checks should be performed before proceeding
onto specifi c diagnostics:
- Ensure that the control unit has not been disconnected 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 chapter
should be carried out by a qualified engineer and if
needed by the After Sales Service.
230V~
CYL.
21
DHW
CH1
CH2
ON
DHW
OFF
1
2
-
+
BUS
NTC
2
1
3
Key
1 Fuse
2 Green LED, power supply
3 Red LED fl ashes, fault
Fault Possible cause Solution
Green LED
permanently 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-connect
the power supply.
Replace the main
supply fuse in the
control unit (see
technical data).
Red LED fl ashes
quickly (2 Hz, 2
fl ashes/second)
Short circuit of
the connected
temperature 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 fl ashes
slowly (0,5 Hz, 1
fl ashes/ 2 seconds)
Communications error
with the eBUS boiler.
Check that the
boiler'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)
compatibility and
connections.
Check the valve
connections.
Check the room
thermostat(s) pairing.
Ensure that there is
no interruption to the
electricity supply and
that the unit control
is properly connected
and turned on.
DHW valve not
operating
Fault domestic hot
water cylinder
Cylinder dual
thermostat
disconnected.
The temperature
sensor is defective or
disconnected.
Check the cylinder
dual thermostat
and temperature
connections.
Check the sensor’s
resistance.
Ensure that there is
no interruption to the
electricity supply and
that the control unit
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".
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