INsTALLATIoN
Troubleshooting
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69
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GL
ISH
Note
Refit the appliance cover after completing your work. See
chapter "Maintenance and cleaning / Fitting the appliance
cover".
14.1 Fault codes
Fault description
remedy
2
Contin-
uously
on
The cylinder top sensor is
faulty. The actual temperature
display switches from the cyl-
inder top sensor to the integral
sensor. The appliance contin-
ues to heat without any loss of
comfort. The mixed water vol-
ume cannot be calculated and
is displayed as "- -".
Check that the plug is seated
correctly.
Measure the resistance of the
sensor and compare it with
the resistance table.
Install the replacement sen-
sor.
4
Contin-
uously
on
The integral sensor is faulty.
In the event of a faulty integral
sensor, the integral sensor is
set to the value of the cylinder
top sensor, and the mixed
water volume is calculated
using this value. The appliance
continues to heat with a re-
duced start hysteresis.
A mixed water volume is
still calculated, based on the
assumption that the cylinder
top temperature is reached
throughout the DHW cylinder.
Check that the plug is seated
correctly.
Measure the resistance of the
sensor and compare it with
the resistance table.
Install the replacement sen-
sor. In the service menu, use
parameter "IE" to switch to
standby mode.
6
Flash-
ing
The cylinder top sensor and the
integral sensor are faulty. The
appliance no longer delivers
heat.
Check that the plug is seated
correctly.
Measure the resistances of
the sensor and compare them
with the resistance table.
Install the replacement sen-
sor. In the service menu, use
parameter "IE" to switch to
standby mode.
8
Flash-
ing
The appliance has ascertained
that the DHW cylinder has not
been heated within the max-
imum temperature increase
time, despite there being a
demand.
Check if a DHW circulation
line is installed and wheth-
er it is insulated. The total
output loss is greater than
the heating output of the
appliance.
Check if a DHW circulation
pump is installed and wheth-
er it is controlled according to
temperature or time. If neces-
sary, install a corresponding
control unit.
Check the refrigerant circuit
for leaks.
Fault description
remedy
16
Contin-
uously
on
A short circuit of the impressed
current anode has occurred or
the protective anode is faulty.
Check the cables and relevant
plug-in connections of the
impressed current anode
according to the connection
diagram and replace faulty
cables.
Check the impressed current
anode in the heating element/
anode assembly and replace
if necessary.
32
Flash-
ing
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 appliance
starts.
The anode current is inter-
rupted. The appliance is not
heating.
Check the contacts of the im-
pressed current anode.
64
Contin-
uously
on
The defrost temperature has
not yet been reached after the
maximum defrost time has
elapsed. The compressor is not
working.
Check the position of the
evaporator sensor in the
evaporator.
Check the response of the
solenoid diverter valves when
the appliance voltage is con-
nected. Replace the coil body
if necessary.
Replace the solenoid valve
body.
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.
Check that the plug is seated
correctly and replace the con-
necting cable if necessary.
Replace the programming
unit PCB.
256
Flash-
ing
Manually activated emergency
mode (only electric emergency/
booster heater active)
See chapter "Appliance de-
scription / Emergency mode".
512 Flash-
ing
A fault has occurred in the re-
frigerant circuit.
Check the refrigerant circuit
for leaks.
Check the function and set-
ting of the expansion valve.
E 1 Flash-
ing
The temperature sensor on the
air inlet is faulty.
Check that the plug is seated
correctly.
Measure the resistance of the
sensor and compare it with
the resistance table.
Replace the sensor.
E 2 Flash-
ing
The temperature sensor on the
evaporator is faulty.
Check that the plug is seated
correctly.
Measure the resistance of the
sensor and compare it with
the resistance table.
Replace the sensor.
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.
Check that the plug is seated
correctly.
Measure the resistance of the
sensor and compare it with
the resistance table.
Replace the sensor.