FRITZ!DECT 301 Serwis - Baza wiedzy

FRITZ!DECT 301 Serwis

Batteries in FRITZ!DECT radiator control drain quickly

The batteries in FRITZ!DECT radiator control go dead after just a few days or weeks. The battery level displayed in the FRITZ!Box user interface for the radiator control is low. If the push service is enabled, you also receive emails notifying you that the battery is low.

Note:The battery level displayed is only an approximate value based on the open-circuit voltage. Since battery status reports are sent early on, you can usually use the batteries for several more days. Under normal conditions of use, the radiator control's batteries last for at least the duration of one heating period; however, the actual service life depends on the switching cycles, movability of the valve, and the use of manual functions such as the boost function.

1 Checking whether the update failed

If you set up an external temperature sensor, the automatic update may fail repeatedly which may use up the batteries quickly. Therefore, check whether the update for the radiator control can be installed:

  1. Click "Home Network" in the FRITZ!Box user interface.
  2. Click on "Mesh Networking" in the "Home Network" menu.
  3. If "Update available" is displayed for the radiator control you are experiencing the issue with, click on the link to install the update.
  4. If the previous firmware version is displayed again after a while and the update is not installed, follow the instructions in our guide Cannot update the firmware of a FRITZ!DECT radiator control.

2 Using high-quality batteries

  1. Do not use rechargeable batteries in the radiator control. Rechargeable batteries usually have a higher internal resistance and a higher self-discharge rate than disposable batteries and produce lower voltages. This can affect how the radiator control functions and shorten operating time.
  2. Do not use zinc-carbon batteries. Due to their construction, they are not suitable for use in radiator controls.
  3. Use high-quality batteries with a long service life, for example Varta Industrial AA, Varta Longlife AA, Duracell Industrial AA, GP Super Alkaline LR6.
  4. Do not mix used and new batteries.
  5. Make sure that the batteries are firmly seated between the battery springs.