HomeMatic IP HmIP-WTH-B-2 Manual De Instalacion Y Uso página 36

Troubleshooting
10 Troubleshooting
10.1 Low battery
Provided that the voltage value per-
mits it, the wall thermostat will remain
ready for operation also if the battery
voltage is low. Depending on the par-
ticular 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, the empty battery symbol
( ) and the corresponding error code
will be displayed on the device
„10.4 Error codes and flashing sequen-
ces" on page 37). In this case, re-
place the empty batteries by two new
batteries (see „9 Replacing batteries" on
page 35).
10.2 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 „13 General information
about radio operation" on page
This may be caused by the following:
• Receiver cannot be reached.
• Receiver is unable to execute the
command (load failure, mechanical
blockade, etc.).
• Receiver is faulty.
10.3 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-
(see
formity to this regulation.
During normal operation, the duty
cycle is not usually reached. However,
repeated and radio-intensive pairing
processes 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 three slow flashes 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).
39).
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