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Troubleshooting
8 Troubleshooting
8.1
Low battery
Provided that the voltage value permits
it, the temperature and humidity sen-
sor will remain ready for operation also
if the battery voltage is low. Depending
on the particular load, it may be pos-
sible to send transmissions again re-
peatedly, once the batteries have been
allowed a brief recovery period.
If the voltage drops too far during
transmission, this will be displayed on
the device or via the Homematic IP app
(see „8.4 Error codes and flashing se-
quences" on page
replace the empty batteries by two
new batteries
(see „7 Changing the bat-
teries" on page
22).
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 failed transmis-
sion may be caused by radio inter-
ference
(see „11 General information
about radio operation" on page
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.
24). In this case,
25).
8.3
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. 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 pair pro-
cesses 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 one long flashing of the device LED,
and may manifest itself in the device
temporarily working incorrectly. The
device starts working correctly again
after a short period (max. 1 hour).
23
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