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Knowledge document #3422
FRITZ!DECT 300
This support document is available for the following products:

Adjusting the temperature measured on a FRITZ!DECT radiator control

Since the temperature is measured on your radiator control, for example FRITZ!DECT 301, it may be warmer or colder elsewhere in the room. You can easily set the deviation from the actual room temperature that you measure with a thermometer in the middle of the room, for example, as the "offset". As an alternative, you can use FRITZ!DECT 440 as an external temperature sensor and position it at a suitable place in the room to measure the temperature, for example next to the sofa.

Requirements / Restrictions

  • To use FRITZ!DECT 440 as an external temperature sensor, FRITZ!OS 7.10 or later must be installed on the FRITZ!Box.

Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.

1 Setting the temperature offset

The temperature of a room is very different in different areas, especially during the heating phase. The time it takes for heat to distribute evenly depends on the ceiling height or the presence of niches and bay windows, for example, and can vary greatly. Therefore, do not set the offset until the room was constantly heated to the desired room temperatures for about 2 days so that the heat could be almost evenly distributed throughout the room:

Important:The temperature at the device itself can vary greatly because of fluctuations due to time of day, for example occasional exposure to sunlight or reduced ventilation, heating up of the device, etc. The deviation between the temperature at the device itself and the actual room temperature is therefore not constant. The offset cannot be used to take variable temperature fluctuations into account.

  1. Click "Smart Home" in the FRITZ!Box user interface.
  2. Click "Device Management" or "Devices and Groups" in the "Smart Home" menu.
  3. Click the (Edit) button for the respective device.
  4. Under "Temperature Offset", set the actual room temperature by clicking the plus or minus.
  5. Click "OK" or "Apply" to save the settings.

2 Using a different temperature sensor

We recommend using FRITZ!DECT 440 as an external temperature sensor because you can position it at the most suitable place in the room to measure the temperature:

Note:Smart plugs, for example FRITZ!DECT 200 or a FRITZ!DECT Repeater, can also measure the temperature. Note, however, that sockets you have to plug these devices into are usually in unfavorable places for measuring the room temperature, for example in corners of rooms or near the floor. These areas of the room are usually unsuitable places to use external temperature sensors.

Using a temperature sensor

  1. Position FRITZ!DECT 440 at a suitable place in the room for measuring temperature, for example next to the sofa.
  2. Do not operate any devices near FRITZ!DECT 440 that produce warmth.

Selecting the temperature sensor

  1. Click "Home Network" or "Smart Home" in the FRITZ!Box user interface.
  2. Click "Smart Home" in the "Home Network" menu or click "Device Management" in the "Smart Home" menu.
  3. Click the (Edit) button for the respective radiator control.
  4. Under "Temperature Offset" enable the option "Adjust to automatic offset by means of an external temperature sensor".
  5. Select the desired temperature from the drop-down list.
  6. Click "OK" to save the settings.
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