INSTALLATION
Troubleshooting
26 | VRC-W 400 (E) www.stiebel-eltron.com
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 Remedy
--- No fault
present
1
Short cir-
cuit, supply
air tempera-
ture sensor
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. Unplug connector X7 from
the electronic assembly. Test the
sensor.
2
Cable break,
supply air
temperature
sensor
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. Unplug connector X7 from
the electronic assembly. Test the
sensor.
3
Short
circuit,
exhaust air
temperature
sensor
No effect
Isolate the appliance from the
power supply. Check the sensor
cable. Unplug connector X8 from
the electronic assembly. Test the
sensor.
4
Cable break,
exhaust air
temperature
sensor
No effect
Isolate the appliance from the
power supply. Check the sensor
cable. Unplug connector X8 from
the electronic assembly. Test the
sensor.
5
No differen-
tial pressure
– supply air
sensor
To avoid build-up of
negative pressure in the
rooms, the appliance
switches off both fans.
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.
6
No differen-
tial pressure
– exhaust
air sensor
The unit switches off
the exhaust air fan. The
supply air fan remains in
operation.
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 Remedy
7
No differen-
tial pressure
– extract air
sensor
Constant pressure control
is not possible. The appli-
ance switches to flow rate
control.
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".
8
No humidity
value for the
extract air
The unit cannot provide
humidity protection.
Isolate the appliance from the
power supply. Check the sensor
cable. Replace the sensor.
9
No humidity
value for the
outdoor air
The unit cannot provide
humidity protection.
Isolate the appliance from the
power supply. Check the sensor
cable. Replace the sensor.
10
No temper-
ature value
for the ex-
tract air
Automatic bypass mode
is not possible. Manual
changeover of the bypass
damper with the options
"Disabled" and "Bypass/
window contact" for
"Operating mode heat re-
covery bypass" parameter
is possible.
Isolate the appliance from the
power supply. Check the sensor
cable.
11
No temper-
ature value
for the out-
door air
Automatic bypass mode
is not possible. Manual
changeover of the bypass
damper with the options
"Disabled" and "Bypass/
window contact" for
"Operating mode heat re-
covery bypass" parameter
is possible.
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.
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.
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.
202
No RTC
pulse
Time-dependent program
sequences are disrupted.
Isolate the appliance from the
power supply. Replace the elec-
tronic assembly.
203
Sensor volt-
age too low
The unit controls the fans
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.
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.
204
Supply air
shutdown
If the supply air temper-
ature drops below 5°C,
the fan is switched off.
Check the preheating coil.
344462-45598-9853_VRC-W_400_E_en_fr_it_nl.indb 26344462-45598-9853_VRC-W_400_E_en_fr_it_nl.indb 26 07.07.2023 17:00:3007.07.2023 17:00:30
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