INsTALLATIoN
Maintenance and cleaning
70
| WWK 221-301 electronic
www.stiebel-eltron.com
Fault description
remedy
E 16
Contin-
uously
on
The high pressure switch
has responded. Compressor
heating mode is temporarily
blocked. Compressor heating
mode will continue as soon as
the pressure has normalised.
No action required.
After consultation with the
customer, reduce the set tem-
perature if required. Increase
the charge level with the pro-
gramming unit.
Check the offset of the inte-
gral sensor to the cylinder
top sensor and adjust if nec-
essary.
Check the high pressure
switching point and replace
the high pressure switch if
necessary.
E 32
Contin-
uously
on
An electrical fault has occurred.
A1/X2 : Check whether the
power supply has been inter-
rupted. Then reset the fault
with the corresponding menu
option.
E 64
Flash-
ing
Evaporator temperature < Mini-
mum evaporator temperature
Check whether the evaporator
is clogged with deposits. If
required, clean the evapora-
tor with clear water without
cleaning agents or other
additives.
Check whether air can flow
freely through the appliance.
Check whether the fan is
blocked or faulty. Replace the
fan if necessary.
Check the function and set-
ting of the expansion valve.
Check whether the appliance
has defrosted.
E 128
Flash-
ing
A permanent pressure switch
fault has occurred. A pressure
fault occurred multiple times
within a defined pressure fault
evaluation time.
Check the relevant fault
counter and look up the
corresponding fault code
remedy: E 16 (high pressure),
E 32 (electrical wiring fault).
Once the cause of the fault
has been eliminated, clear
the fault code in menu item
"Hd 1" by pressing the "Rapid
heat-up" button.
14.2 Resetting the high limit safety cut-out
D
00000
40
66
4
1
1 Reset button for high limit safety cut-out
The high limit safety cut-out protects the appliance from overheat-
ing. The electric emergency/booster heater is switched off when
the cylinder water temperature exceeds 85 °C.
f
f
Once the cause of the fault has been removed, press the reset
button of the high limit safety cut-out on the rod thermostat.
To do so, remove the appliance cover.
14.3 Motor overload relay
In the event of excessive thermal load on the compressor, the
motor overload relay switches the compressor off.
f
f
Remove the cause.
After a short cooling period, the motor overload relay will restart
the compressor automatically.
15. Maintenance and cleaning
WARNING Electrocution
Prior to all work on the appliance, isolate it from the
power supply.
15.1 Removing the appliance cover
D
00000
40
66
6
f
f
Undo the screw (Torx) that secures the programming/control
cover to the appliance.
f
f
Push the programming/control cover upwards.