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7
Troubleshooting
7.1
Weak batteries
Provided that the voltage value permits it, the window /
door contact 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 repeated-
ly, 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 50).
In this case, replace the empty batteries by two new bat-
teries (see "6 Replacing batteries" on page 47).
7.2
Command not confirmed
If at least one receiver does not confirm a command, the
device LED (C) 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 53). 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.
Troubleshooting
49
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