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Domestic ventilation unit M Flex Air (Plus)
Code
Display
E24
E24: Sensor4
E25: External Modbus
E25
communication
E26
E26: No tacho signal
E27
E27: Heater
E31
E31: Bypass start
* Message/fault only with active fireplace function
HINWEIS
NOTE
Note: Once the fault has been rectified, it is acknowledged
with a power reset (switch off the power supply for 5 s and
switch it on again).
11.1 Internal sensors
The ventilation unit is equipped with internal sensors (in the
outside air and exhaust air) for temperature, humidity and VOC
(air quality) and with two further sensors in the fans for measur-
ing temperature, humidity, speed and volume flow.
The outside air and exhaust air sensors must be completely re-
placed in the event of a malfunction. If the measured values
from the fans fail, the fans should also be completely replaced.
11.2 Replacing fans
Fig. 11.2:Left fan
www.glendimplex.de
Status
Fault
Off
Sensor 4 extract air
No external Modbus communica-
In operation
tion
No tacho signal from fan VM1 /
Off
VM2
No control of preheating register
Off
Bypass does not switch
In operation
DOK4SVxxDEN · FD 9912
Cause
Sensor or cable faulty
Modbus cable faulty, interface
parameter settings incorrect, CPU
card faulty
Sensor or cable faulty
Cable, PTC element or power card
faulty, temperature parameter set-
tings incorrect
No power consumption, bypass
motor, cable break
Fig. 11.1:Messages and faults
Fig. 11.3:Right fan
If a fan has to be replaced, it can only be removed once the EPP
condensate plate has been carefully removed to the front and
the cable has been disconnected.
If the incorrect assembly is fitted, the retaining plate (installa-
tion on left or right) can be modified, see Fig. 11.2 and Fig. 11.3.
The assignment for control as an exhaust air of outside air fan is
defined by the colour of the connecting plug in the wiring har-
ness (outside air blue, exhaust air black).
To teach in the new fan, load the factory settings in the service
menu, carry out the fan configuration and re-enter the unit con-
figuration (for U/V see type plate).
11.3 Replacing the bypass
If the bypass has to be replaced, it can be directly disconnected
from the bypass motor and removed.
Insert the new bypass in the correct slot and connect.
It starts functioning and performs a trial run once the power has
been restored.
11.4 Replacing the heating register
For procedure, see chapter 4.3.
It starts functioning once the power has been restored.
English
Action
Check / replace extract air sensor
Check / replace Modbus cable,
correct interface parameter set-
tings, replace CPU card
Check / replace fan VM1 / VM2
Check / replace cable, PTC ele-
ment or power card, adjust tem-
perature parameter settings
Check bypass cable,
check / replace bypass flap
37
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