STIEBEL ELTRON WWK 302 H - Page 16

OpEraTiON
Troubleshooting
16 | WWK222-302 H www.stiebel-eltron.com
Fault description Remedy
256 Flashing Manually activated emer-
gency mode (only electric
emergency/booster heater
active)
See chapter “Appliance descrip-
tion/ Emergency mode”.
512 Flashing
A fault has occurred in the
refrigerant circuit.
Check the refrigerant circuit for
leaks.
Check the function and setting of
the expansion valve.
If several faults occur, the fault codes are added together.
Example: If both the cylinder top sensor and the integral sensor
are faulty, the display shows fault code6 (=2+4).
Application scenarios for emergency heating mode
If the appliance shows fault code8, you can manually enable
emergency heating mode. If a different fault occurred previously,
but did not cause the appliance to shut down, the display may
show a fault code that is the result of several faults added together.
Listed below are the fault codes which will allow you to enable
emergency heating mode.
Fault code displayed
8 8
10 Fault code 8 + fault code 2
12 8+4
24 8+16
26 8+2+16
28 8+4+16
138 8+2+128
140 8+4+128
152 8+16+128
154 8+2+16+128
156 8+4+16+128
When the appliance is operating in emergency heating mode, the
fault code shown is incremented by 256.
E fault code
Fault description Remedy
E 2 Flashing
The temperature sen-
sor on the evaporator
is faulty.
Check that the plug is seated cor-
rectly.
Measure the resistance of the sen-
sor and compare it with the resist-
ance table.
Replace the sensor.
E 4 Continu-
ously on
The hot gas tem-
perature sensor is
faulty. The appliance
continues to heat. To
protect the appliance,
the (possibly higher)
set temperature is re-
duced to the set value
for setback.
Check that the plug is seated cor-
rectly.
Measure the resistance of the sen-
sor and compare it with the resist-
ance table.
Replace the sensor.
Fault description Remedy
E 16 Continu-
ously on
The high pressure
switch has responded.
Compressor heating
mode is temporarily
blocked. Compressor
heating mode will
continue as soon as
the pressure has nor-
malised.
No action required.
After consultation with the custom-
er, reduce the set temperature if
required. Increase the charge level
with the programming unit.
Check the offset of the integral sen-
sor to the cylinder top sensor and
adjust if necessary.
Check the high pressure switching
point and replace the high pressure
switch if necessary.
E 32 Continu-
ously on
An electrical fault has
occurred.
A1/X2 : Check whether the power
supply has been interrupted. Then
reset the fault with the correspond-
ing menu option.
E 64 Flashing
Evaporator tempera-
ture < Minimum evap-
orator temperature
Check whether the evaporator is
clogged with deposits. If required,
clean the evaporator 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 setting of
the expansion valve.
E 128 Flashing A permanent pres-
sure switch fault has
occurred. A pressure
fault occurred multiple
times within a defined
pressure fault evalua-
tion 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 press-
ing the "Rapid heat-up" button.
Notifying a qualified contractor
If you cannot remedy the fault, notify your qualified contractor. In
Australia, contact us directly (1800153351). To facilitate and speed
up your enquiry, please provide the serial number from the type
plate (000000-0000-000000). The type plate can be found on the
left, above the "DHW outlet" connection.
Sample type plate
000000-0000-000000
D0000035352
1
1 Number on the type plate