INsTALLATIoN
Troubleshooting
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ENGLISH
15. Troubleshooting
WARNING Electrocution
Disconnect the power supply by unplugging the appli-
ance from the mains before carrying out work inside
the appliance.
Fault Effect Remedy
--- No fault present
E8 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.
E10 No temperature value for the
extract air
Passive cooling is not possible. Manual activation of passive cooling
with options 0 and 1 of parameter P3 is possible.
Isolate the appliance from the power supply. Check the
sensor cable.
E11 No temperature value for the
outdoor air
Passive cooling is not possible. Manual activation of passive cooling
with options 0 and 1 of parameter P3 is possible.
Isolate the appliance from the power supply. Check the
sensor cable.
E16 The condensate float switch
has responded.
The unit switches off the fans. Check the condensate drain. Check the cable for break-
ages.
E17 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.
E18 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.
E101
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.
E102
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.
E105
Maximum outdoor air tem-
perature 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 continuity. Check the
sensor cable.
E201 No RTC communication (RTC
= real-time clock)
Time-dependent program sequences are disrupted. Isolate the appliance from the power supply. Replace
the electronic assembly.
E202 No RTC pulse Time-dependent program sequences are disrupted. Isolate the appliance from the power supply. Replace
the electronic assembly.
E203
Sensor voltage incorrect
The unit controls the fans with the maximum value of the currently set
fan stage. The unit cannot provide humidity protection. Automatic pas-
sive cooling is not possible. Manual activation of passive cooling with
options 0 and 1 of parameter P3 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.
E204 Supply air shutdown If the supply air temperature falls below 5°C, the fan is switched off. Check the preheating coil. Check the triac for continuity.
E205 Maximum outdoor air tem-
perature exceeded
The high limit safety cut-out may respond. Isolate the appliance from the power supply. Check the
triac for continuity. Check the sensor cable.
If fault E16 is displayed, faults E101 and E102 are also displayed
in the fault memory.
16. Disposal
Removal
WARNING Electrocution
Disconnect the appliance from the power supply.
The following tools are required for disassembly and material
separation prior to disposal:
- Personal protective equipment
- Set of screwdrivers
- Set of spanners
- Combi pliers
- Stanley knife
326794-41212-9444_LWZ_130_de_en.indb 47 09.05.2019 12:06:09
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