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Troubleshooting
7 Troubleshooting
7.1 Weak battery
Provided that the voltage value permits it, the contact in-
terface 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
„7.4 Error codes and flashing sequences“ on page 36).
In this case, replace the empty batteries by two new bat
-
teries (see „6 Changing battery“ on page 34).
7.2 Command not confirmed
If at least one receiver does not confirm a command, the
device LED (B) lights up red at the end of the failed trans-
mission process. The failed transmission may be caused
by radio interference (see „10 General information about
radio operation“ on page 39). The failed transmission
may also be caused by the following:
• Receiver cannot be reached.
• Receiver is unable to execute the command (load
failure, mechanical blockade, etc.).
• Receiver is defective.
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