oPerATIoN
Troubleshooting
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55
EN
GL
ISH
Fault description
remedy
32
Flashing
The appliance is not being op-
erated with a completely filled
DHW cylinder. The appliance is
not heating.
Fill the DHW cylinder of the
appliance. The fault code
disappears and the appli-
ance starts.
The anode current is interrupt-
ed. The appliance is not heating.
Notify a qualified contractor.
64
Contin-
uously
on
The defrost temperature has not
yet been reached after the max-
imum defrost time has elapsed.
The compressor is not working.
The fault is reset automat-
ically once the evaporator
temperature has risen to the
defrost end temperature.
Notify a qualified contractor.
128
Contin-
uously
on
There is no communication
between the controller and the
programming unit. The most
recently selected set values are
active. The appliance continues
to heat.
Notify a qualified contractor.
256
Flashing
Manually activated emergency
mode (only electric emergency/
booster heater active)
See chapter "Appliance
description / Emergency
mode".
512 Flashing A fault has occurred in the re-
frigerant circuit.
Notify a qualified contractor.
E 1 Flashing The temperature sensor on the
air inlet is faulty.
Notify a qualified contractor.
E 2 Flashing The temperature sensor on the
evaporator is faulty.
Notify a qualified contractor.
E 4
Contin-
uously
on
The hot gas temperature sensor
is faulty. The appliance con-
tinues to heat. To protect the
appliance, the (possibly higher)
set temperature is reduced to
the set value for setback.
Notify a qualified contractor.
E 16
Contin-
uously
on
The high pressure switch has
responded. Compressor heating
mode is temporarily blocked.
Compressor heating mode will
continue as soon as the pressure
has normalised.
Wait until the pressure has
normalised.
E 32
Contin-
uously
on
An electrical fault has occurred.
Notify a qualified contractor.
E 64 Flashing Evaporator temperature < Mini-
mum evaporator temperature
Notify a qualified contractor.
E 128
Flashing
A permanent pressure switch
fault has occurred. A pressure
fault occurred multiple times
within a defined pressure fault
evaluation time.
Notify a qualified contractor.
If several faults occur, the fault codes are added together.
Example: If both the cylinder top sensor and the integral sensor
are faulty, the display shows fault code 6 (= 2+4).
Application scenarios for emergency heating 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 heating 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 enquiry, please provide the serial
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