STIEBEL ELTRON WWK 220 electronic - 6 Troubleshooting

OPERATION
Troubleshooting
ENGLISH
www.stiebel-eltron.com WWK 220-300 electronic | 11
6. Troubleshooting
Problem Cause Remedy
No hot water is
available.
No power at the appli-
ance.
Check that the appliance
is connected to the power
supply.
A fuse/MCB in the fuse
box has blown/respond-
ed.
Check whether the fuses/
MCBs in your fuse box have
blown/responded. If required,
disconnect the appliance from
the power supply and replace
the fuses/reset the MCBs.
Contact your contractor if the
fuse blows again after the
appliance is connected to the
power supply.
The air intake or air dis-
charge of the appliance is
blocked.
Check the air intake grille
and air discharge grille for
contamination. Remove any
contamination (see chapter
"Maintenance and care").
The ambient temperature
exceeds the upper appli-
cation limit (see chapter
"Specification/ Data
table"). The appliance
safety equipment has
responded and the ap-
pliance has switched off
automatically.
Wait for the appliance to cool
down. Call a qualified con-
tractor if the appliance does
not switch back on automat-
ically.
The ambient temperature
falls below the lower ap-
plication limit (see chap-
ter "Specification/ Data
table"). The evaporator is
currently being defrosted.
Wait until the appliance
switches back on automati-
cally.
The appliance is
not heating the
DHW cylinder
although the heat
pump symbol is
illuminated.
The blocking time for
compressor has not
yet elapsed. Once the
compressor has been
switched off, it will only
be switched back on
again after the 20minute
compressor blocking time
has elapsed.
The safety valve
of the cold water
supply line is drip-
ping.
These units are under
water mains pressure.
During the heat-up pro-
cess, expansion water will
drip from the safety valve.
Notify a qualified contractor if
water continues to drip when
heating is completed.
The condensate
drain drips.
The surface temperature
of the evaporator is lower
than the dew point tem-
perature of the ambient
air. Condensate forms.
The amount of condensate
depends on the air humidity
level.
The room temper-
ature drops too
low.
Operation of the appliance can
cause the room temperature
to fall by 1 to 3°C. If the room
temperature falls by more
than 5°C, check the room size
(see chapter "Specification/
Data table"). Increasing the
room size by opening a door
to another room will remedy
this.
Service/fault sym-
bol is continuously
illuminated.
See chapter "Fault codes". Notify a qualified contractor.
Problem Cause Remedy
Service/fault sym-
bol flashes and
the water does not
heat up.
See chapter "Fault codes". It is imperative that you notify
a qualified contractor.
The "heat pump"
symbol is illu-
minated but the
compressor is not
running. The fan is
running.
The appliance is in defrost
mode.
No action required.
The "heat pump"
symbol is flashing.
There is a heat demand,
but the compressor is
blocked.
No action required. The
compressor switches itself
on automatically after the
compressor blocking time
has elapsed. The compressor
blocking time lasts 20minutes
once the compressor has been
switched off. The symbol stops
flashing automatically.
The "electric emer-
gency/booster
heater" symbol is
flashing.
A temperature control-
ler has switched off the
"electric emergency/
booster heater" during
quick 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
releases the "electric emer-
gency/booster heater". The
symbol goes out when the
temperature throughout the
DHW cylinder reaches the set
temperature of 65°C.
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