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Fault
Possible cause
A software fault has
occurred.
Interrupted signal
The WLAN router is
transmission
too far away from
the WLAN module.
Reception is suffer-
ing interference,
e.g. from other
devices with lead
casings.
The app does not re-
A software fault has
spond.
occurred.
16 Troubleshooting (qualified con-
tractors)
Fault
Possible cause
The programming
I²C connection faulty Check the cables
unit does not start.
The bypass damper
The connection con-
is moving in the
figuration has been
wrong direction.
set incorrectly.
Message codes
Code
Message
Appliance re-
sponse
30397 Supply air temper-
No passive house
ature outside per-
comfort temperat-
missible range
ure control
30398 Exhaust air tem-
No effect
perature outside
permissible range
30399 Outdoor air tem-
The appliance does
perature preheated
not regulate to the
beyond permiss-
comfort temperat-
ible range
ure. Preheating coil
not running or only
at low output.
50400 Communication er-
The supply air fan
ror, supply air dif-
and exhaust air fan
ferential pressure
are shut down.
50401 Communication er-
The supply air fan
ror, exhaust air
and exhaust air fan
differential pres-
are shut down.
sure
30403 Communication er-
Sensor control shut
ror, fine dust
down
sensor
30404 Supply air fan (no
No effect
feedback on speed)
30405 Exhaust air fan (no
No effect
feedback on speed)
www.stiebel-eltron.com
Troubleshooting (qualified contractors)
Remedy
Code
Reduce the distance
between the WLAN
30406 Communication er-
router and the
WLAN module. Ex-
tend the range of
the WLAN router.
Restart the ventila-
tion unit.
Change the installed
position of the
WLAN module or
use a WLAN re-
peater.
Extend the range of
the WLAN router.
30407 Communication er-
Wait for 10 minutes.
The WLAN module
reconnects to the
WLAN network.
Restart the ventila-
tion unit.
Restart the app.
30408 Faulty preheating
Remedy
and plugs. Replace
damaged cables.
50409 Heater contact has
Cause
30172 Float switch has
Lead break,
short circuit,
faulty sensor,
30410 Sensor voltage,
or appliance
type (right/left-
hand version)
set incorrectly
Lead break,
short circuit or
faulty sensor
Lead break,
short circuit or
30416 Internal fault
faulty sensor
16.1 Sensor resistance values
Lead break,
When measuring with a multimeter, the resistance values serve
short circuit or
faulty sensor
only to identify faulty or incorrect sensors. Measuring with a
multimeter is too imprecise to test for accuracy.
Lead break,
short circuit or
faulty sensor
Supply air
Lead break,
Exhaust air
short circuit or
faulty sensor
PT 1000
No speed feed-
back despite
Temperature [°C]
actuation
-30
No speed feed-
-20
back despite
actuation
-10
Message
Appliance re-
sponse
The appliance can-
ror, outdoor air
not provide humid-
humidity and tem-
ity protection.
perature sensor
Automatic bypass
mode is not pos-
sible. Manual
changeover of the
bypass damper is
possible using the
"Disabled" and "By-
pass/window con-
tact" options in the
"Operating mode
heat recovery by-
pass" parameter.
The appliance can-
ror, extract air hu-
not provide humid-
midity and temper-
ity protection.
ature sensor
Automatic bypass
mode is not pos-
sible. Manual
changeover of the
bypass damper is
possible using the
"Disabled" and "By-
pass/window con-
tact" options in the
"Operating mode
heat recovery by-
pass" parameter.
No effect
coil (temperature
too low, supply air
fan switched off)
Fans are operated
been triggered
at 10 %, flow rate
control disabled
Fans shut down
been triggered
Collection of pres-
ventilation
sure, temperatures
and humidity val-
ues not possible.
Automatic bypass
mode is not pos-
sible. Fans run at
maximum value for
set fan setting.
Sensor type
PT 1000
PT 1000
Resistance [Ω]
882
922
961
LWZ-W 450/600 Premium |
Cause
Lead break,
short circuit or
faulty sensor
Lead break,
short circuit or
faulty sensor
The preheating
coil is not de-
livering
enough energy
to heat the
outdoor air.
Faulty heater
or triac.
Heater contact
has been
triggered, neg-
ative pressure
in building
Float switch
has been
triggered
No appliance
type con-
figured
61
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