OPERATION
Troubleshooting
14 | WWK 223-303 electronic www.stiebel-eltron.com
Problem Cause Remedy
For indoor in-
stallation : The
room tempera-
ture drops.
operation of the appliance
can cause the room temper-
ature to fall by 1 to 3°C, as
the appliance extracts energy
from the air.
If the room temperature falls
by more than 5°C, check the
room size (see the "Specifi-
cation/Data table" chapter).
Supplying energy by opening
a door to another room will
remedy this.
High power con-
sumption
The lower the intake tem-
perature, the lower the heat
pump efficiency.
Where possible, avoid high
set temperatures and the use
of rapid heat-up.
Runtime-dependent rapid
heat-up is activated.
Only activate this function if
really necessary or increase
the runtime during which the
heat pump operates alone
and the electric emergency/
booster heater is blocked via
your selected parameters.
Service/fault
symbol is per-
manently on.
See the "Fault codes" chapter.
Notify a qualified contractor.
A permanently lit "service/
fault" symbol indicates that
a fault has occurred, but the
heat pump is heating never-
theless.
Service/fault
symbol flashes
and the water
does not heat
up.
See the "Fault codes" chapter.
It is imperative that you notify
a qualified contractor quickly.
A flashing "service/fault"
symbol indicates that a fault
has occurred and the heat
pump is no longer heating.
Defrost symbol
is shown.
The appliance is in defrost
mode.
No action required.
The heat pump
symbol is flash-
ing.
There is a heat demand, but
the compressor is locked out.
No action required. The com-
pressor restarts automatically
after the compressor lockout
time has elapsed. The symbol
stops flashing automatically.
The intake air temperature is
outside the application limits
(see "Specification/ Data
table" chapter). The compres-
sor was switched off/locked
automatically.
No action required. The ap-
pliance heats the water using
the electric emergency/boost-
er heater. As soon as the tem-
perature is back within the
application limits, the heating
process is continued with the
compressor.
The electric
emergency/
booster heater
symbol is flash-
ing.
A temperature controller
has switched off the electric
emergency/booster heater
during rapid heat-up.
No action required. The ap-
pliance continues the quick
heat-up process using the
heat pump. The symbol stops
flashing when the controller
re-enables the electric emer-
gency/booster heater. The
symbol goes out when the
temperature throughout the
DHW cylinder reaches the set
rapid heat-up temperature.
The electric
emergency/
booster heater
symbol is illu-
minated but the
electric emer-
gency/booster
heater is not
operational.
The electric emergency/
booster heater lights up when
there is a demand. The inter-
nal controller of the electric
emergency/booster heater
may have ended electric
heating. A possible cause
may be a fault in the electric
emergency/booster heater.
A possible cause may be that
the high limit safety cut-out
has responded.
Have a qualified contractor
check whether the controller
of the electric emergency/
booster heater is set correct-
ly. The controller must be
turned fully anti-clockwise.
Have a qualified contractor
check the high limit safety
cut-out.
Problem Cause Remedy
The "electric
emergency/
booster heat-
er" symbol
illuminates even
though the ap-
pliance is within
the application
limits and "rapid
heat-up" has not
been pressed.
The "runtime-dependent
rapid heat-up" function is en-
abled and currently in use.
No action required.
Automatic mode of the
electric emergency/booster
heater has been enabled. This
occurs when DHW demand is
detected via the cylinder top
sensor.
No action required.
Fault code
If the service/fault symbol is flashing or continuously illuminated
on the display, you can call up a fault code.
Keep pressing "Menu" until the fault code
appears.
Fault description Remedy
2
Steadily
on
The sensor at the cylinder top is
faulty. The actual temperature
display switches from the cyl-
inder top sensor to the integral
sensor. The appliance continues
to heat without any loss of com-
fort. The mixed water volume
cannot be calculated and is dis-
played as "- -".
Notify a qualified contractor.
4
Steadily
on
The integral sensor is faulty.
In the event of a faulty integral
sensor, the integral sensor is
set to the value of the sensor at
the cylinder top, and amount of
mixed water is calculated using
this value. The appliance contin-
ues to heat with a reduced start
hysteresis.
A mixed water volume is still cal-
culated, based on the assumption
that the cylinder top temperature
is reached throughout the DHW
cylinder.
Notify a qualified contractor.
6
flashing
The sensor at the cylinder top
and the integral sensor are
faulty. The appliance no longer
delivers heat.
Notify a qualified contractor.
8
flashing
The appliance has ascertained
that the DHW cylinder has not
been heated within the maxi-
mum temperature increase time,
despite there being a demand.
You can temporarily contin-
ue to use the appliance by
pressing the "Rapid heat-up"
key to activate emergency
heating mode. See chapter
"Appliance description/
Emergency mode".
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