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What to do when the Siemens Connected Home system is not working?

If an error code appears on the display of your radiator thermostat, or the LED indicator of the switching unit is flashing or lighting up suspiciously, find out what this means and how to proceed in the table below, or in the technical manual of the product. In case of a radiator thermostat, do not leave the device in error mode for a long time, or remove the batteries to prevent them from discharging.

Radiator Thermostatic Head SSA911.01ZB 


Device Status

LED indicator flashing red 

Device software update in progress; temperature control is not possible.

LED indicator lights up red

Error in starting up. 

LED indicator flashing green

Waiting for user confirmation (used to start a task).

LED indicator lights green for 5 seconds 

Task successfully completed. 

ER1 - No valve detected

Properly mount the actuator on the thermostatic valve.

Use the correct adapter.

ER2 - Closure point not detected

ER3 - Valve movement not possible

Check if the valve pin is freely movable.

ERR - Actuator connection failed

The device is not in communication establishment mode.

The device is out of range. 

RCR110.2ZB Switching Unit


Device Status

LED indicator lights up orange


LED indicator flashes green rapidly

Connecting to the ZigBee network.

LED indicator lights up green

Successful connection.

LED indicator blinks red slowly

ZigBee network malfunction. 

Relay outputs will turn off. 

Check if the ZigBee router is on, and try to shorten the distance between the device and the router. 

Try to reconnect the device to the ZigBee network again.

LED indicator lights up red

Hardware malfunction. 

LED indicator alternates red and green

Reset to factory settings.

LED indicator flashes orange rapidly

Firmware update in progress. 

LED indicator blinks green slowly

Manual switching. 

LED indicator flashes three times rapidly (0.5 Hz), then returns to the previous state

Output state change. 

It may happen that an error occurs in the Connected Home app, preventing the pairing of the app with the ZigBee router. In such a case, install an older version of the Connected Home app (download for Android here), connect with the ZigBee router and after pairing, update the app to the latest version. 

Siemens Connected Home components usually pair with the ZigBee router within a few seconds. If an error occurs during this process, you need to reset the device to factory settings and repeat the pairing.

To reset the factory settings of the radiator heads, press all three control buttons simultaneously and hold them for 10 seconds (the countdown is displayed on the screen). After the reset, the LED indicator flashes red to indicate an ongoing update. Before reconnecting, the head needs to be removed from the list of devices in the app. 

To reset the switching unit, do similarly: press the control button and hold it for about 10 seconds until the LED indicator starts flashing alternately green and orange to indicate that the factory settings have been restored. Once you release the button, the LED indicator lights up orange and the switching unit is ready to be re-paired with the router. It is not necessary to remove the switching unit from the list of devices in the app; this change occurs automatically as part of the reset.

Siemens radiator valves are equipped with a child lock that locks the valve to prevent changes in temperature or settings. By activating the child lock, you block manual control of the valves, but control via the mobile app will still be available. Turn on the lock by simultaneously pressing the plus (+) and minus (-) buttons and holding them for 3 seconds, deactivate it in the same way.

The Siemens Connected Home smart heating system is designed to control heating over the internet, so it does not have a touch screen and must be connected to a smart phone or tablet. Therefore, any tablet that can fully replace the touch control unit is sufficient for local control; just install the Siemens Connected Home app on it.

Yes, of course. It applies that one ZigBee router can control up to 32 radiator valves. To control a larger number, you need to add another router to the system, increasing the maximum number of valves by another 32. 

The range of the ZigBee signal is up to 60 m indoors under ideal conditions, but in practice, this distance can be significantly shorter depending on "obstacles" (walls - reinforced concrete and slate are the most signal-problematic building materials, signal interference, etc.). Easily increase the signal range and strength by adding a signal repeater: ZigBee router or wireless switching unit. We recommend choosing another router as a repeater where you need to extend the signal to other floors or in environments with impenetrable walls. In other cases, an additional switching unit is sufficient for greater ZigBee signal range. For larger applications, signal boosting options are described in the question “The signal range is not enough for me, what are my options?”.

If you are installing Siemens Connected Home smart heating in larger applications, the number of valves and the range of the ZigBee signal may not be sufficient. In such cases, it is important for the proper functioning of smart heating to connect signal amplifiers to the central ZigBee router, as shown in the connection diagram below. To pair with Siemens Connected Home components located on different floors or behind signal-impermeable walls, we recommend using an additional ZigBee router as a signal repeater. You can connect up to 4 valves to each repeater, and you can connect up to 3 repeaters in a row.

Smart Heating for Commercial Buildings

Most likely, there is not a strong enough connection between the valves and the ZigBee router, meaning the ZigBee signal is too weak, or the valves keep disconnecting and reconnecting due to the signal. To strengthen the signal, add a repeater: ZigBee router or switching unit. Battery depletion can also occur when the valve is in error mode (an error code appears on the display). In such cases, resolve the error or remove the batteries.