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Troubleshooting Troubleshooting
Caution! There is a risk of explosion if the battery
is not replaced correctly. Replace only with the
same or equivalent type. Never recharge standard
batteries. Do not throw the batteries into a fire. Do
not expose batteries to excessive heat. Do not
short-circuit batteries. Doing so will present a risk
of explosion.
Used batteries should not be disposed of with
regular domestic waste! Instead, take them to
your local battery disposal point.
8 Troubleshooting
8.1 Weak batteries
Provided that the voltage value permits it, the temperature
and humidity sensor will remain ready for operation also
if the battery voltage is low. Depending on the particu-
lar load, it may be possible to send transmissions again
repeatedly, once the batteries have been allowed a brief
recovery period.
If the battery voltage is too weak, this will be displayed
in the Homematic IP app and directly on the device via
the device LED
(B)
(see “8.3 Error codes and flashing se-
quences” on page 36). In this case, replace the empty
batteries by two new batteries (see “7 Replacing batteries”
on page 33).
8.2 Duty cycle
The duty cycle is a legally regulated limit of the transmis-
sion time of devices 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
seconds 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 designed
and produced with 100% conformity to this regulation.
During normal operation, the duty cycle is not usually
reached. However, repeated and radio-intensive teach-
in processes mean that it may be reached in isolated in-
stances during start-up or initial installation of a system.
If the duty cycle is exceeded, this is indicated by one long
red lighting of the device LED (C), and may manifest itself
in the device temporarily working incorrectly. The device
starts working correctly again after a short period (max.
1 hour).
18


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