OPERATION
Maintenance and care
10 | WWK 220-300 electronic www.stiebel-eltron.com
4.4.2 Emergency mode
If the appliance is faulty, you can use the emergency mode to
activate the electric emergency/booster heater.
The compressor shuts down if, following a DHW demand, no tem-
perature increase is captured for 6 hours (24 intervals of 15min-
utes each, during which the temperature increase is <0.25°C re-
spectively). The fault key flashes on the display and a fault code
indicates that the appliance is not heating the water.
In such an event you can activate emergency mode by press-
ing the rapid heating key. After the rapid heating key has been
pressed, the indicated fault code increases by a value of 256, as
the fault codes are added together (see fault code table in chapter
"Troubleshooting"). The fault key continues to flash. The electric
emergency/booster heater is activated.
The current set temperature (set temperature1 or set tempera-
ture2) is ignored. In emergency mode, the appliance operates
with a fixed set temperature of 40°C. Following a one-off activa-
tion of the function via the rapid heating key, this function remains
active for 7days.
Following 7days of emergency operation the electric emergency/
booster heater is deactivated. The fault code shown on the display
decreases by 256.
If you press the rapid heating key again within the 7days of emer-
gency operation, the 7-day runtime for emergency mode will start
afresh from that point.
If the 7-day runtime for emergency mode has passed, you can
restart emergency operation for a further 7days by pressing the
rapid heating key.
Pressing the rapid heating key only activates emergency mode if
a fault with fault code8 occurred previously. In standard mode
pressing the rapid heating key only triggers a one-off heating of
the DHW cylinder.
Emergency mode is no longer active after an interruption of the
power supply. The appliance tries to heat with the heat pump
again. Fault code8 is only set after 6hours. Only then can emer-
gency mode be manually activated again via the rapid heating key.
4.5 Emergency shutdown
In the event of an emergency, carry out the following steps:
Interrupt the power supply by unplugging the appliance from
the mains or by tripping the MCB.
Shut off the cold water supply.
Immediately notify a qualified contractor, as the appliance
is not protected against corrosion while the power supply is
interrupted.
5. Maintenance and care
WARNING Electrocution
Only clean the exterior of the appliance.
Never open the appliance.
Do not insert objects through the grille into the interior
of the appliance.
Never spray the appliance with water.
Never spray water into the appliance.
!
WARNING Injury
Maintenance work, such as checking the electrical safe-
ty, must only be carried out by a qualified contractor.
Appliance compo-
nents
Care and maintenance tips
Casing Use a damp cloth to clean the casing sections. Never
use abrasive or corrosive cleaning agents.
Air intake grille / air
discharge grille
Clean the air intake grille and air discharge grille
every six months. Cobwebs or other kinds of contami-
nation can restrict the air supply to the appliance.
DHW cylinder
The DHW cylinder is equipped with a mainte-
nance-free impressed current anode to safeguard
it against corrosion. The power supply must not be
interrupted while the appliance is filled with water to
enable the impressed current anode to provide pro-
tection. Otherwise there is a risk of corrosion.
Electric emergency/
booster heater
Have the electric emergency/booster heater descaled
from time to time. This will extend the service life of
the electric emergency/booster heater.
Appliance Have the safety assembly and the evaporator checked
regularly by a qualified contractor.
Condensate drain
Undo the condensate drain. Check that the condensate
drain is clear and remove any dirt from the conden-
sate drain connection of the appliance.
314104-38523-9034_WWK_220-300_electronic_en_pl.indb 10 24.02.2015 10:33:29
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