OpEraTiON
Troubleshooting
www.stiebel-eltron.com WWK222-302 H | 15
Problem Cause
Remedy
The “Electric
emergency/
booster heat-
er” symbol is
flashing.
A temperature controller has
switched off the electric emer-
gency/booster heater during
rapid heat-up.
No action required. The appli-
ance continues the rapid heat-up
process using the heat pump.
The symbol stops flashing when
the controller re-enables the
electric emergency/booster
heater. The symbol goes out
when the temperature through-
out the DHW cylinder reaches
the set rapid heat-up temper-
ature.
The “Electric
emergency/
booster heat-
er” symbol
is illumi-
nated but
the electric
emergency/
booster
heater is not
operational.
The "Electric emergency/
booster heater" symbol is
illuminated when there is a
demand. The internal control-
ler of the electric emergency/
booster heater may have
ended electric heating. A pos-
sible 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/boost-
er heater is set correctly. The
controller must be turned fully
anti-clockwise. Have a qualified
contractor check the high limit
safety cut-out.
Fault code
You can call up a fault code if the "Service/fault" symbol is flashing
or continuously illuminated on the display.
Repeatedly press the "Menu" button until
the fault code is shown after set temper-
ature2.
Fault code appears
Fault description Remedy
2
Continu-
ously on
The cylinder top sensor is
faulty. The actual tempera-
ture display switches from
the cylinder top sensor to
the integral sensor. The
appliance continues to heat
without any loss of com-
fort. The mixed water vol-
ume cannot be calculated
and is displayed as "- -".
Check that the plug is seated cor-
rectly.
Measure the resistance of the
sensor and compare it with the
resistance table.
Install the replacement cylinder
top sensor.
Fault description Remedy
4
Continu-
ously 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 appli-
ance continues to heat with
a reduced 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 cor-
rectly.
Measure the resistance of the
sensor and compare it with the
resistance table.
Install the replacement sensor. In
the service menu, use parameter
"IE" to switch to standby mode.
6
Flashing
The cylinder top sensor
and the integral sensor are
faulty. The appliance no
longer delivers heat.
Check that the plug is seated cor-
rectly.
Measure the resistances of the
sensor and compare them with the
resistance table.
Install the replacement sensor. In
the service menu, use parameter
"IE" to switch to standby mode.
8
Flashing
The appliance has as-
certained that the DHW
cylinder has not been
heated within the maxi-
mum temperature increase
time, despite there being a
demand.
Check if a DHW circulation line is
installed and whether it is insulat-
ed. The total output loss is greater
than the heating output of the
appliance.
Check the refrigerant circuit for
leaks.
16
Continu-
ously on
A short circuit of the im-
pressed current anode has
occurred or the protective
anode is faulty.
Check the cables and relevant
plug-in connections of the im-
pressed current anode according
to the connection diagram and
replace faulty cables.
Check the impressed current anode
in the heating element/anode as-
sembly and replace if necessary.
32
Flashing
The appliance is not being
operated with a completely
filled DHW cylinder. The
appliance is not heating.
Fill the DHW cylinder of the appli-
ance. 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
Continu-
ously on
The defrost temperature
has not yet been reached
after the maximum defrost
time has elapsed. The com-
pressor is not working.
Check the position of the evapora-
tor sensor in the evaporator.
Check the response of the solenoid
diverter valves when the appliance
voltage is connected. Replace the
coil body if necessary.
Replace the solenoid valve body.
128
Continu-
ously on
There is no communication
between the controller and
the programming unit. The
most recently selected set
values are active. The ap-
pliance continues to heat.
Check that the plug is seated cor-
rectly and replace the connecting
cable if necessary.
Replace the programming unit
PCB.
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