OPERATION
Troubleshooting
14
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Fault code
You can call up a fault code if the Service/fault symbol is flashing
or continuously lit on the display.
Keep pressing "Menu" until the fault code
appears.
Fault
code
Service/
fault
symbol
Fault description
Remedy
2
permanent-
ly on
The sensor at the cylinder top is
faulty. The actual temperature
display changes over to the
integral sensor. The appliance
continues to deliver heat. The
amount of mixed water shown
is always less than 10 litres.
4
permanent-
ly on
The integral sensor is faulty.
In the event of a faulty integral
sensor, the integral sensor is
set to the value at the cylinder
top sensor and amount of
mixed water is calculated using
this value. The appliance con-
tinues to deliver heat.
Notify a qualified con-
tractor.
6
flashes
The sensor at the cylinder top
and the integral sensor are
faulty. The appliance no longer
delivers heat.
Notify a qualified con-
tractor.
8
flashes
The appliance has ascertained
that the DHW cylinder has not
been heated for 13 hours, de-
spite there being a demand.
You can continue to
use the appliance by
activating emergency
mode. See chapter
"Emergency mode".
16
permanent-
ly on
Short circuit impressed current
anode or protective anode
faulty
Immediately notify a
qualified contractor,
as the appliance is not
protected against cor-
rosion if the impressed
current anode is faulty.
32
flashes
The appliance is operating with
an empty cylinder or the appli-
ance is not delivering heat.
Fill the appliance. The
fault code disappears
and the appliance
starts.
The anode current is inter-
rupted. The appliance does not
heat up.
The qualified contrac-
tor needs to check the
impressed current
anode and the wiring.
64
flashes
After an hour of defrosting, the
evaporator temperature has not
yet reached 3 °C. The compres-
sor is faulty.
The fault is reset once
the evaporator temper-
ature rises to 3 °C. If
the fault is continuous-
ly displayed, a solenoid
diverter valve fault may
be the cause. Notify a
qualified contractor.
128
permanent-
ly on
No communication between
controller and programming
unit. The most recently selected
set values are active.
256
flashes
Manually activated emergency
mode (only electric emergency/
booster heater enabled)
See chapter "Appliance
description / Emergen-
cy mode".
If several faults occur, the fault codes are added up.
Example: If both the sensor at the cylinder top and the integral
sensor are faulty, the display shows fault code 6 (= 2+4).
Application scenarios for emergency mode
If the appliance shows fault code 8, you can manually activate
emergency mode. If a different fault occurred previously, but did
not cause the appliance to switch off, the display will show a fault
code that is the result of several faults added together.
Listed below are the fault codes which will allow you to enable
emergency mode.
Fault code displayed
8
8
10
Fault code 8 + fault code 2
12
8+4
24
8+16
26
8+2+16
28
8+4+16
138
8+2+128
140
8+4+128
152
8+16+128
154
8+2+16+128
156
8+4+16+128
When the appliance is operating in emergency mode, the fault
code shown is incremented by 256.
E fault code
Press "Menu" repeatedly. If a fault code preceded by E is dis-
played, please notify a qualified contractor. The fault code gives
the qualified contractor information about the cause of the fault
(see "Troubleshooting" chapter).
Notifying a qualified contractor
If you cannot remedy the fault, notify your qualified contractor.
To facilitate and speed up your request, provide the number from
the type plate (000000-0000-000000). The type plate can be found
on the left, above the DHW outlet connection.
Sample type plate
000000-0000-000000
D
00000
40
66
1
1
1 Number on the type plate
