INSTALLATIoN
Troubleshooting
58
| LWZ 130 | LWZ 130 Enthalpie
www.stiebel-eltron.com
Cleaning the fans
You can clean the fans without disconnecting the cables leading
to the fans. Nevertheless, we recommend removing the control
panel cover. Then you can unplug the control cable and power
cable from the printed circuit board.
f
Undo the screws securing the fans.
f
Clean the fans with a soft brush.
Cleaning the preheater
In principle, the preheater does not need to be cleaned. Inade-
quate filter changing can cause dust to build up in the appliance.
In this case, the preheater does need to be cleaned.
Refitting the components
f
Push the fan units back into the appliance.
f
Reconnect the fan cables.
f
Fit the control panel cover.
f
Slide the cross-countercurrent heat exchanger back into the
appliance.
f
Push the wedge back in again.
f
Fit the condensate pan.
Cleaning the air ducts
Air ducts must be checked at regular intervals and cleaned if nec-
essary. Disconnect the air ducts from the appliance or carry out in-
spection and cleaning through the extract air and supply air vents.
15. Troubleshooting
WARNING Electrocution
Disconnect the appliance from the power supply before
carrying out work inside the appliance.
f
Disconnect the appliance from the power supply
and secure it against unauthorised reconnection.
Fault (Exxx)
xxx Fault
Effect
Remedy
--- No fault
present
8
No humidity
value for the
extract air
The appliance cannot
provide humidity pro-
tection.
Isolate the appliance from the
power supply. Check the sensor
cable. Replace the sensor.
10
No temper-
ature value
for the ex-
tract air
Bypass mode is not
possible with extract air
routing. Bypass mode
can be manually enabled
with the option "Bypass/
window contact" in the
parameter "Operating
mode heat recovery by-
pass".
Isolate the appliance from the
power supply. Check the sensor
cable.
11
No temper-
ature value
for the out-
door air
Bypass mode is not pos-
sible with outdoor air
routing. Bypass mode
can be manually enabled
with the option "Bypass/
window contact" in the
parameter "Operating
mode heat recovery by-
pass".
Isolate the appliance from the
power supply. Check the sensor
cable.
16
The conden-
sate float
switch has
responded.
The unit switches off the
fans.
Check the condensate drain.
Check the cable for breakages.
17
Outdoor air
temperature
sensor short
circuit
No control to the comfort
temperature required for
passive houses of at least
16.5 °C in the supply air
Isolate the appliance from the
power supply. Check the sensor
cable.
18
Outdoor air
temperature
sensor lead
break
No control to the comfort
temperature required for
passive houses of at least
16.5 °C in the supply air
Isolate the appliance from the
power supply. Check the sensor
cable.
101
Supply air
fan
The unit does not receive
any speed feedback from
the fan. There is no effect
on the flow rate control
mode.
Isolate the appliance from the
power supply. Check the cabling.
Check the PWM control signal
that the electronic assembly
sends to the fan. Check the speed
signal that the fan sends to the
electronic assembly. Replace
the fan.
102
Exhaust air
fan
The unit does not receive
any speed feedback from
the fan. There is no effect
on the flow rate control
mode.
Isolate the appliance from the
power supply. Check the cabling.
Check the PWM control signal
that the electronic assembly
sends to the fan. Check the speed
signal that the fan sends to the
electronic assembly. Replace
the fan.
105
Maximum
outdoor air
temperature
exceeded
The high limit safety cut-
out may respond.
Isolate the appliance from the
power supply. Check the air flow
rate. Check the triac for continui-
ty. Check the sensor cable.
201
No RTC
communi-
cation (RTC
= real-time
clock)
Time-dependent program
sequences are disrupted.
Isolate the appliance from the
power supply. Replace the elec-
tronic assembly.
