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Troubleshooting
8 Troubleshooting
8.1 Weak batteries
Provided that the voltage value per-
mits it, the device will remain ready for
operation even if the battery voltage is
low. Depending on the particular load,
it may be possible to send transmis-
sions again repeatedly once the batter-
ies 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 device
(see „8.3 Error codes and flashing se-
quences" on page
replace the empty batteries with two
new ones
(see „7 Changing the batter-
ies" on page
24).
8.2 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 ends.
Homematic IP devices are designed
and produced with 100% conformity 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
26). In this case,
or initial installation of a system. If the
duty cycle is exceeded, this is indicated
by one long red flashing 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).
25
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