EN
GL
ISH
WWW.STIEBEL-ELTRON.COM
LWZ 170 E PLUS / LWZ 370 PLUS |
25
INSTALLATION
Troubleshooting
14. Troubleshooting
Fault code Blocking
fault
Cause
Appliance behaviour
Measure
E100
no
Supply air fan pressure
sensor faulty. Red pressure
hoses blocked or kinked.
Switches over to constant speed control. At an
outside temperature below 0 °C, the preheat-
er coil switches on.
Isolate the appliance from the power supply. Check
the red pressure hoses (including pressure tubes) for
dirt, kinks or damage.
E101
no
Extract air fan pressure
sensor faulty. Blue pressure
hoses blocked or kinked.
Switches over to constant speed control. At an
outside temperature below 0 °C, the preheat-
er coil switches on.
Isolate the appliance from the power supply. Check
the blue pressure hoses (including pressure tubes)
for dirt, kinks or damage.
E103
no
Bypass faulty.
None. If the power is too low, the stepper
motor is not correctly connected or is faulty;
if the power is too high, there is a short cir-
cuit in the cabling or the stepper motor.
Isolate the appliance from the power supply. Check
the stepper motor connection. Replace the cabling or
stepper motor if required.
E104
Yes
Extract air fan faulty
Both fans are switched off. The preheater coil
is switched off. The reheater coil, if present,
is switched off. Restarting occurs every 5
minutes.
Isolate the appliance from the power supply. Replace
the extract air fan. Switch on the power supply to
the appliance again. The fault is reset automatically.
Check the cabling.
E105
Yes
Supply air fan faulty
Both fans are switched off. The preheater coil
is switched off. The reheater coil, if present,
is switched off. Restarting occurs every 5
minutes.
Isolate the appliance from the power supply. Replace
the supply air fan. Switch on the power supply to
the appliance again. The fault is reset automatically.
Check the cabling.
E106
Yes
The temperature sensor for
capturing the outside tem-
perature is faulty.
Both fans are switched off.
The preheater coil is switched off.
Bypass closes and is blocked.
Isolate the appliance from the power supply. Replace
the outside temperature sensor. Switch on the power
supply to the appliance again. The fault is reset au-
tomatically.
E107
no
The temperature sensor for
capturing the extract air
temperature is faulty.
Bypass closes and is blocked.
Isolate the appliance from the power supply. Replace
the room temperature sensor.
E108
no
If installed: The tempera-
ture sensor for capturing
the outside temperature is
faulty.
The reheater coil, if present, is switched off.
The geothermal heat exchanger, if present, is
switched off.
Replace the temperature sensor for the outside tem-
perature.
E999
Yes
The microswitches on the
control PCB are not set
correctly.
The appliance does not operate; the red fault
LEDs at the stage switch are also off.
Adjust the microswitches correctly.
Correct microswitch setting
f
f
Check whether the microswitches on the control PCB are
set correctly (see diagram). If message E999 is nevertheless
displayed, replace the control PCB with a PCB of the correct
type.
LWZ 370 plus
26
�0
4�
15
�0
01
8
LWZ 170 E plus
D
00000
45
29
9
Stage switch modular connector
If stage 2 on a stage switch does not work, the modular connector
of the stage switch is not connected correctly.
f
f
Cut off one of the RJ plug-in connections to the stage switch
and fit a new plug-in connection the other way round.
Pressure drop at the connections of the pressure hoses
For fan control, the appliance takes into account the pressure
readings. The pressure sensors are fitted to the control PCB. Two
pressure hoses are routed from each fan to the pressure sen-
sors. If the pressure hoses are not connected correctly, leak or
are blocked, pressure is captured incorrectly and the fans are
therefore not correctly controlled.
f
f
Check the connections of the pressure hoses if you have
doubts about the correct functioning of the appliance.
