User manual

43
Troubleshooting
8 Troubleshooting
8.1 Weak batteries
Provided that the voltage value permits it, the weather sensor 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 too far during transmission, this will be displayed on
the device or via the Homematic IP app (see „8.4 Error codes and flashing
sequences“ on page 44). In this case, replace the empty batteries by
two new batteries (s. „7 Replacing batteries“ on page 41).
8.2 Command not confirmed
If at least one receiver does not confirm a command, the system LED
(K) lights up red at the end of the failed transmission process. The failed
transmission may be caused by radio interference (see „12 General infor-
mation about radio operation“ on page 50). This may be caused be the
following:
• Receiver cannot be reached.
• Receiver is unable to execute the command (load failure, me-
chanical blockade, etc.).
• Receiver is defective.
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