Operating instructions
M-WRG-S/Z-S, M-WRG-S/Z-24,
M-WRG-S/Z-EIB, M-WRG-S/Z-KNX (-F, -FC) ventilation units
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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
V E N T I L AT I O N & H E AT R E C O V E R Y
16 Troubleshooting
Error
Cause
Remedy
Ventilation unit is not running
Standby mode (see
section 13.2 on page 24)
active
Exit standby mode
Ventilation unit is in safe mode
after an EMC fault
Switch the ventilation unit off,
wait 15 s, then switch on
Installation error
Have the wiring checked by a
qualified electrician
Faulty switch, motor or
controller
Check by a qualified electrician
Air flaps do not open after
switching on
After a long stoppage or when
starting up for the first time, the
servomotor is not powered by
the electronic circuit.
Switch the ventilation unit off
and on again
Air flap range of motion is
blocked by foreign bodies
(plaster, polystyrene, etc.)
Carefully remove the foreign
bodies, remove the cover
Ventilation unit starts to beep
at intervals
Air filter is dirty or one-year
interval for filter changes is
exceeded
Change air filters (see „14.3
The ventilation unit frequently
activates the frost protection
function