HomeMatic IP HmIP-SWDM-2 Notice D'installation Et D'emploi page 26

Troubleshooting
8 Troubleshooting
8.1 Weak batteries
Provided that the voltage value per-
mits it, the window / door contact will
remain ready for operation also if the
battery voltage is low. Depending on
the particular load, it may be possible
to send transmissions again repeatedly,
once the batteries have been allowed a
brief recovery period.
If the voltage drops again while
sending, this will be displayed in the
Homematic IP app and on the
see „8.4 Error codes and flashing se-
quences" on page
replace the empty batteries with two
new ones (see „7 Changing the batter-
ies" on page 25).
8.2 Command not confirmed
If at least one receiver does not con-
firm a command, the device LED lights
up red at the end of the failed trans-
mission process. The reason for the
failed transmission may be radio inter-
ference, (see „11 General information
about radio operation" on page
This may be caused by the following:
• Receiver cannot be reached,
• Receiver is unable to execute the
command (load failure, mechanical
blockade, etc.), or
• Receiver is faulty.
device(-
27). In this case,
28).
8.3 Duty cycle
The duty cycle is a legally regulated
limit of the transmission time of de-
vices in the 868 MHz range. The aim
of this regulation is to safeguard the
operation 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 sec-
onds in an hour). Devices must cease
transmission when they reach the 1%
limit until this time restriction comes to
an end. Homematic IP 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 indicated
by three slow red flashes of the de-
vice LED, and may manifest itself in the
device temporarily working incorrect-
ly. The device starts working correctly
again after a short period (max. 1 hour).
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