Radiator Thermostat help

If your Bosch Smart Home Thermostat reports that the valve travel is too long, it is possible that the plunger on your radiator is not traveling the required distance.

If you use an adapter, make sure that it is properly mounted and completely rests on the valve.

In addition, the valve pin may be calcified.
To check this, you can try to press the valve pin in carefully with your finger. If this is not possible or you are unsure, please contact a specialist.

If you are unable to find the cause on the valve, please contact ourCustomer supportin contact. Please send us pictures of your radiator valve so that we can check the problem.

There are several ways to do this. The most common are:

1. screw cap. A simple twisting off is sufficient.

2. clip lock: The thermostat must be clipped off at the side.

3. Allen lock: The thermostat must be dismantled from the side using an Allen key. If in doubt, always seek the help of qualified personnel.

If you still have questions or problems with the integration, accessibility or use of the device, please feel free to contact ourCustomer supportreport

If they are having trouble installing your Bosch Smart Home Radiator thermostat, follow these steps:

1. perform the installation again. To do this, check whether the device has already been detected ("Devices" menu item) and remove it if necessary.

Perform a reset before reinstalling the thermostat. To do this, press and hold the thermostat's Mode button while reinserting the batteries until the thermostat's LED flashes orange. Release briefly and press the button again until the LED turns green. Then wait briefly and follow the instructions to connect again.

Check that the batteries are inserted correctly and that the LCD display is active. Make sure that the component is at least 1 m away from the controller during teach-in.

Disconnect the Smart Home controller from power briefly and try again.

Please also have a look at our reset video on this page or on ourBosch Smart Home Youtube Channel.

When calibrating the Radiator thermostat during installation, soft, buzzing noises may occur. However, if loud or creaking noises can be heard repeatedly from the thermostat during operation, it could be defective or not properly fastened. Please check again that the Radiator thermostat is fastened correctly.

A few heater models require an adapter, which is included with the Bosch Smart Home Radiator thermostat accessories.
Please also note theOperating/installation instructions.

You can attach the Bosch Smart Home Radiator thermostat to almost all radiators. All you need to do is remove your old thermostat and attach the Bosch Smart Home Radiator thermostat.

You may need an adapter for your existing valve. If the adapters supplied do not fit, it is possible to purchase additional adapters. The overview of the available adapters and their assignment to the different valve types you will findhere.

Yes, via Management >> Devices >> Thermostats >> Select appropriate thermostat >> "Measured temperature" section, the temperature measured at the thermostat can be displayed. The display already includes the set adjustment of the temperature.

For technical reasons, the temperature is measured directly at the respective thermostat by means of a sensor. Therefore, there may be deviations in the temperature, e.g. in the center of the room. The deviating measurement at the thermostat module can be corrected by means of adjustment.

Please note that parts of the described products and their functions may only be available in Germany and Austria.

In exceptional cases, recalibration of the Bosch Smart Home Radiator thermostat is necessary (calibration error, valve travel too long).

To start the calibration, briefly press the mode key. Alternatively, remove a battery and insert it again. The calibration should now start automatically.

Currently, you can integrate the following Bosch Smart Home products into Apple HomeKit: Smart plug and Plug compact, Radiator thermostat as well as Radiator thermostat II, Door/window contact as well as Door/window contact II, Shutter control, Light control, Light/window control II, Motion detector, Twinguard as well as Smoke alarm I , Smoke alarm II and Room thermostat 230V.

Our Bosch Smart Home devices can currently only be used in conjunction with the Bosch Smart Home controller (1st generation) in Apple HomeKit. Unfortunately, integration via the Bosch Smart Home controller II is not yet possible.

The Radiator thermostat is screwed directly to the radiator valve. The rest of the procedure is explained to you step by step via the installation wizard in the app.

The battery charge of the Radiator thermostat may be very low. The temperature control now does not work as usual.

Please replace the batteries as soon as possible. The thermostat requires two batteries of type AA, also called mignon batteries or LR06.

If the display remains blank after replacing the batteries, remove the batteries, press any button for several seconds and reinsert the batteries.

If the Bosch Smart Home Radiator thermostat does not fit your radiator, use one of the included adapters. If none of the adapters fit on your radiator, you will find here aOverviewvia all adapters that are available in the retail trade.

Push the corresponding adapter completely onto the valve (up to the stop). A click is usually heard when the adapter is correctly seated.

If you are unsure, take 3 photos of your radiator valve from different angles and send them to ourCustomer service.

The temperature unit setting is defined centrally in the operating system for iOS devices (Apple). The apps usually use these settings.

To change please go to the following path to the operating system settings: Settings >> General >> Language & Region >> Temperature Unit.

On Android devices, this setting is usually controlled via the system language. A specific setting is usually not possible.

The Radiator thermostat can only act on the valve via the motor power. Without the power supply from the batteries, this is no longer possible.

Therefore, when the battery voltage falls below 2.1 volts, the Radiator thermostat moves to the emergency position, i.e. to a position with a valve opening of 15%. This means that a specific temperature can no longer be maintained. However, the opening of 15% is in any case sufficient to maintain an approximately normal room temperature until a battery replacement can be made.

The SFA mode is the internal control mode of the device and may have been triggered accidentally by pressing the circle key and minus key on the thermostat simultaneously for some time. You exit the SFA mode by pressing the circle key on the thermostat for some time or by waiting a little.

Wait a few seconds after opening the Door/window contact. If the room or the thermostats still do not switch to setback mode, this can have various causes:

1. check whether the window contact indicates opening and closing by the built-in LED. In addition, the window contact of the affected window must be assigned to the same room as the thermostat.

2. the components of the window contact must not be more than 8mm apart and must be placed at the same height (lower edge) so that they can find each other.

The batteries must be correctly inserted in the window contact and the thermostat.

Check that two or three LEDs are lit continuously on your Smart Home controller, depending on whether you have enabled remote access.

In your app, you can select which Door/window contacts should use the ventilation detection under "Services" >> "Ventilation detection".

Here you can set the reaction time from which the thermostat regulates down. This saves the batteries of the Radiator thermostats during shock ventilation or when, for example, a balcony door is only opened briefly.

If your Bosch thermostat has no connection, check if the thermostat can still be controlled manually. If this is the case, it is possible that the distance between the Smart Home controller and the component is too great, or that other electronic products are having a disruptive effect on the connection.

If there are other electronic products in the vicinity of the Smart Home controller and/or the Radiator thermostat, check whether you can change the position of the components and whether this will result in a change in the accessibility of your thermostat.

Also, make sure that the component is at least 1 meter away from the Smart Home controller.

Yes, you can use your thermostat without Smart Home controller.

In this case, however, the range of functions is severely limited. You do not have time programs and smart functions, but you can adjust the set temperature via the buttons on the device.

For the integration of voice assistants (Google, Alexa) or Homekit, a Smart Home controller is required in any case.

Via the Klimamanger service, the temperature control can be stopped in the warm months (summer break). A selection by rooms allows you to keep the control running in critical rooms (e.g. bathroom). If necessary, you can reactivate the heating manually per room on the thermostat or centrally in the app. The display of your thermostat will show "OFF" when summer break is activated. Ventilation detection and rapid heating are deactivated, but the frost protection function and limescale protection as well as the child safety lock remain active.

The operating instructions for the Bosch Smart Home Radiator thermostat can be found here:

Link to the operating instructions

The Bosch Smart Home Radiator thermostat shows the currently set target temperature on the display. In addition, the temperature display in the Smart Home app can be varied between actual and set temperature.

Changes to the settings (e.g. heating phases) for the Smart Home Radiator thermostat can be made with a tap on the favorites tile as well as via the device management in the Bosch Smart Home app.

To perform a reset on your Bosch Smart Home Thermostat, first remove the batteries from the battery case (one battery is also sufficient).

Press and hold the "Mode" key (circle key/down) already while reinserting the batteries. The LED will flash green/orange shortly afterwards. Nevertheless, continue to hold down the key.

As soon as the LED flashes orange quickly, release the key briefly and press it again until "rES" goes out in the display and the LED flashes green.

Now the device restarts. This process may take a few seconds.

Please also have a look at our reset video on this page or on ourBosch Smart Home Youtube Channel.

"Warm phase" describes the temperature you want your home to be when you are present.

"Cold phase" means the temperature setting that should be active while you are absent.

In the Bosch Smart Home app, you have the option of storing individual temperature profiles for each room. The "Warm phase" and "Cold phase" functions are available for this purpose. To set these profiles, select the respective room in the app's main menu. With a swipe to the left, you can now choose automatic or manual operation. Swiping the screen further to the left takes you to the timer. Here you have the option to set and save individual switching times for heating or lowering for each day.

Fast heating is done via the "Rocket" icon in the view for manual control of the thermostat. The thermostats strongly increase the heat output for a short period of time to bring the room temperature to the desired level as quickly as possible. HI" appears in the thermostat display.

You can set the temperature of your home for each room individually via the Bosch Smart Home app. To do this, go to the home screen in the app and select the room in which you want to set the temperature.

Now you can adjust the room temperature according to your wishes. This is possible by setting the heating and lowering temperature and by setting the timer.

You can also set the heating temperature manually by either setting the manual mode or adjusting the temperature in the app or directly on the thermostat/room thermostat. In this case, the manually set temperature remains set only until the next switching point.

The switching points are used to set up a time profile. You can define a setback value and a heating value via the Bosch Smart Home app and set up to 13 switching points for each day. The thermostat automatically sets the stored temperature at the switching points saved in the time profile. This allows you to decide individually when you want to heat which room and when not.

If the thermostat is in "automatic mode", the temperature is regulated via the Bosch Smart Home app and the presets stored in it. Please also note theOperating/installation instructions.

No, this is not provided. However, you have the option of dividing a real room into several virtual rooms in the Bosch Smart Home app (e.g. "Living room" becomes "Living room left" and "Living room right"). You then move the desired Radiator thermostats into the respective virtual room. This allows the different areas or Radiator thermostats to be controlled independently of each other via App or Room thermostat. This requires one Room thermostat in each virtual room.

Please refer to the current operating instructions for the technical data of the Radiator thermostat under the followingLink.

The thermostatic control valves communicate in the proprietary frequency range (frequency around 868 MHz) with the Smart Home controller at a maximum transmission power of 10 mW for a few milliseconds every few minutes, but for a maximum of 36 seconds within one hour.

Since these are battery-powered end devices, great importance is attached to energy-optimized operation. This results in the lowest possible communication volume between thermostatic control valve and Smart Home controller.

In addition to the radiation power, the radiation exposure also depends on the duration and the distance to the transmitter and is thus also significantly lower than with other radio radiation sources (WLAN, cordless phones (DECT), cell phones, etc.).

Further information can be found, for example, at the German Federal Office for Radiation Protection.

Your Bosch Smart Home Radiator thermostat can be conveniently voice controlled via Amazon Alexa.

In case of technical problems with the Bosch Smart Home Radiator thermostat as well as defect reports, please contact our service via

Contact form

0711 99882733 (for Germany, the service is free of charge, telephone charges may apply according to your tariff. Contact details for other markets can be found here: Smart Home Contact)

Comfortable climate at the touch of a finger: Thanks to the Radiator thermostat with targeted temperature control for individual rooms and intelligent timer, you can easily determine the heat output in your home.

The Bosch Smart Home Radiator thermostat is an individually adjustable thermostat with illuminated LCD display and control LED for regulating the room temperature. You can find out more about the Bosch Smart Home Radiator thermostat at theProduct page.

Do you prefer to sleep at 17.5 °C, but want to be greeted by a comfortably warm bathroom at 7:00 a.m. sharp? Simply set your desired temperature with an accuracy of +/- 0.5 °C directly on the Radiator thermostat or via WLAN using the Bosch Smart Home app. An integrated sensor then continuously measures the current room temperature - and keeps it constant as soon as the setpoint is reached. Several time-controlled settings are possible per day. And you can set a different rhythm for each day of the week. After all, even early risers stay in bed longer on Sundays.

You can find the exact scope of delivery of the Bosch Smart Home Radiator thermostat on the corresponding product page of our webshop. Please follow thisLink.

In the app settings of your thermostats, you can switch a child lock on or off. This ensures that a manual change directly on the thermostat is no longer possible. Changes can then only be made in your Smart Home app or via voice control.