Kessel FKA Instructions For Installation, Operation And Maintenance page 42

Alarm message in the event of a power outage
A power outage is detected by the control unit's battery supply and shown as follows:
– Acoustic alarm (short signal, approx. every 20 seconds)
– Display: Power outage
– One or more LEDs flash according to the fault pattern (at the same interval as the acoustic alarm)
Ill. [15]
Backwater, backwater flap open
Note: The backwater flap can be closed using the control unit's battery power supply.
The acoustic alarm can be switched off by pressing the Alarm key <24>
(approx. 1 second).
Caution, if the Alarm key <24> is pressed for longer than 5 seconds
during a power outage, the control unit's battery supply will be
interrupted. In this case, the backwater flap will not be closed in the
event of backwater because the control unit is switched off.
Operation
FLAP
no backwater, backwater flap closed
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FLAP
Ill. [16]
24
Ill. [17]
FLAP
2019/04