Troubleshooting - STIEBEL ELTRON LWZ 180 Bedienung Und Installation

INSTALLATIoN

Troubleshooting

Checking the condensate drain
Note
The appliance will only function correctly if the conden-
sate drain is working and is filled.
f Check the condensate drain at regular intervals – at
least once every six months.
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 Pull the mains plug out of the socket.
WARNING Electrocution
The power cable must only be replaced (for example if
damaged) by a qualified contractor authorised by the
manufacturer, using an original spare part.
Fault (Exxx)
xxx Fault Effect
--- No fault
present
1 Short cir- No control to the comfort
cuit, supply temperature required for
air tempera- passive houses of at least
ture sensor 16.5 °C in the supply air
2 Cable break, No control to the comfort
supply air temperature required for
temperature passive houses of at least
sensor 16.5 °C in the supply air
3 Short No effect
circuit,
exhaust air
temperature
sensor
4 Cable break, No effect
exhaust air
temperature
sensor
5 No differen- To avoid build-up of
tial pressure negative pressure in the
– supply air rooms, the appliance
sensor switches off both fans.
6 No differen- The unit switches off
tial pressure the exhaust air fan. The
– exhaust supply air fan remains in
air sensor operation.
58 | LWZ 180 | LWZ 280 | LWZ 180 Enthalpie | LWZ 280 Enthalpie
Remedy
Isolate the appliance from the
power supply. Check the sensor
cable. Unplug connector X7 from
the electronic assembly. Test the
sensor.
Isolate the appliance from the
power supply. Check the sensor
cable. Unplug connector X7 from
the electronic assembly. Test the
sensor.
Isolate the appliance from the
power supply. Check the sensor
cable. Unplug connector X8 from
the electronic assembly. Test the
sensor.
Isolate the appliance from the
power supply. Check the sensor
cable. Unplug connector X8 from
the electronic assembly. Test the
sensor.
Isolate the appliance from the
power supply. Check the sensor
cable. Check the pressure hoses
for contamination and damage. If
necessary, replace the sensor and
the hose.
Isolate the appliance from the
power supply. Check the sensor
cable. Check the pressure hoses
for contamination and damage. If
necessary, replace the sensor and
the hose.
xxx Fault Effect
7 No differen- Constant pressure control
tial pressure is not possible. The appli-
– extract air ance switches to flow rate
sensor control.
8 No humidity The unit cannot provide
value for the humidity protection.
extract air
9 No humidity The unit cannot provide
value for the humidity protection.
outdoor air
10 No temper- Automatic bypass mode
ature value is not possible. Manual
for the ex- changeover of the bypass
tract air damper with the options
"Disabled" and "Bypass/
window contact" for
"Operating mode heat re-
covery bypass" parameter
is possible.
11 No temper- Automatic bypass mode
ature value is not possible. Manual
for the out- changeover of the bypass
door air damper with the options
"Disabled" and "Bypass/
window contact" for
"Operating mode heat re-
covery bypass" parameter
is possible.
16 The conden- The unit switches off the
sate float fans.
switch has
responded.
101 Supply air The unit does not receive
fan any speed feedback from
the fan. There is no effect
on the flow rate control
mode.
102 Exhaust air The unit does not receive
fan any speed feedback from
the fan. There is no effect
on the flow rate control
mode.
201 No RTC Time-dependent program
communi- sequences are disrupted.
cation (RTC
= real-time
clock)
202 No RTC Time-dependent program
pulse sequences are disrupted.
203 Sensor volt- The unit controls the fans
age too low with the maximum value
of the currently selected
fan stage. The unit cannot
provide humidity protec-
tion. Automatic bypass
mode is not possible.
Manual changeover of the
bypass damper with the
options "Disabled" and
"Bypass/window contact"
for "Operating mode heat
recovery bypass" param-
eter is possible.
204 Supply air If the supply air temper-
shutdown ature drops below 5 °C,
the fan is switched off.
Remedy
Isolate the appliance from the
power supply. Check the sensor
cable. Check the pressure hoses
for contamination and damage. If
necessary, replace the sensor and
the hose. Check the setting of the
"Fan control".
Isolate the appliance from the
power supply. Check the sensor
cable. Replace the sensor.
Isolate the appliance from the
power supply. Check the sensor
cable. Replace the sensor.
Isolate the appliance from the
power supply. Check the sensor
cable.
Isolate the appliance from the
power supply. Check the sensor
cable.
Check the condensate drain.
Check the cable for breakages.
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.
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.
Isolate the appliance from the
power supply. Replace the elec-
tronic assembly.
Isolate the appliance from the
power supply. Replace the elec-
tronic assembly.
Isolate the appliance from the
power supply. Check the sensor
voltage after disconnecting one
of the following sensor plugs:
X15, X16, X23, X24. Replace the
sensor. Replace the electronic
assembly.
Check the preheating coil.
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