19
Troubleshooting
9 Troubleshooting
9.1 Command not confirmed
If at least one receiver does not confirm
a command, the device LED (A) lights
up red at the end of the failed transmis
-
sion process. The failed transmission
may be caused by radio interfer
ence
(see „12 General information about ra
-
dio operation“ on page 21). This may
be caused be the following:
• Receiver cannot be reached.
• Receiver is unable to execute the
command (load failure, mechanical
blockade, etc.).
• Receiver is defective.
9.2 Duty Cycle
The duty cycle is a legally regulated li-
mit of the transmission time of devices
in the 868 MHz range. The aim of this
regulation is to safeguard the opera-
tion of all devices working in the 868
MHz range.
In the 868 MHz frequency range we
use, the maximum transmission time of
any device is 1% of an hour (i.e. 36 se-
conds in an hour). Devices must cease
transmission when they reach the 1%
limit until this time restriction comes to
an end. HomematicIP devices are de-
signed and produced with 100% con-
formity to this regulation.
During normal operation, the duty
cycle is not usually reached. However,
repeated and radio-intensive pairing
processes mean that it may be reached
in isolated instances during start-up
or initial installation of a system. If the
duty cycle is exceeded, this is indica-
ted by one long lighting of the device
LED (A), and may manifest itself in the
device temporarily working incorrect-
ly. The device starts working correctly
again after a short period (max. 1 hour).
9.3 Automatic disconnection in case
of overload
If the device is overloaded with
load currents greater than 13 A or
with loads with more than 3 kW
power, after a short delay time,
this leads to the device’s automa-
tic disconnection. The safety dis-
connection is reported with an
error message via the app or
WebUI.
To be able to use the device again, you
must remove the overload and unplug
the device once from the socket then
plug it back in again. Alternatively, you
can wait 30 minutes after removing the
overload (“restart lock”). The device
can then be switched on again. The
device is not automatically switched
on after the restart lock has expired.
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