Radiator Thermostat II [+M] help

The E05 message on your Bosch Smart Home Radiator thermostat II means that the plunger of the thermostat cannot move the valve pin on the radiator valve. This could indicate a stiff valve or a problem with the motor of the Radiator thermostat II.

Steps to find a solution

To investigate the problem, please follow these steps:

1. Remove the Radiator thermostat II from the radiator valve.

2. Remove one battery from the battery compartment.

3. Insert the battery again and press the “O” button to confirm. If necessary, press the button again.

The calibration should now start.

If the E03 message appears

If the E03 message “Calibration failed” appears, please check that the radiator valve works properly. If necessary, consult a heating specialist.

If the E05 message is still displayed

If the E05 message persists, this could indicate a motor problem. In this case, please contact our

Customer Support

to discuss the next steps. We are here to help you!

The message E04 on the Bosch Smart Home Radiator thermostat II indicates that the motor is not working correctly. This can occur both during the initial installation and during ongoing operation.

Please first check whether the firmware of the device is up to date. To do so, open the Bosch Smart Home App and navigate to „More > Devices > Radiator thermostat > [affected device]“. If an update is available, please carry it out.

If the firmware is already up to date, briefly press the "O" button on the device. The Radiator thermostat then tries to fix the problem automatically. Should this not be successful after about six minutes, you can repeat the procedure once.

If the message E04 persists, this could indicate a motor problem. In that case please contact our customer service to discuss how to proceed. We are here to help you!

The message E03 displayed on your Radiator thermostat II means that the valve pin could not be moved completely during calibration. In many cases, this is because the device was not mounted correctly on the valve or an incompatible adapter is being used. In this case, please carefully check the installation and use our adapter check to ensure that the correct accessories are being used.

It may also happen that the radiator valve is stiff or slightly calcified. Try carefully checking whether the valve pin can be moved manually. To further narrow down the behavior, you can also test the thermostat on another radiator. A quick look at the batteries is also useful, as insufficient voltage can affect calibration.

If the message continues to be displayed, our customer service is happy to provide further support.

If your inspection reveals a problem with the radiator valve itself, please contact a heating specialist.

In rare cases, it may happen that the small black pin on the Radiator thermostat II falls out. This can occur both during operation and directly during initial installation.

If you notice this behavior with your device, please contact our customer service so that we can review the case individually and provide you with the best possible support.

The E05 message on your Bosch Smart Home Radiator thermostat II means that the plunger of the thermostat cannot move the valve pin on the radiator valve. This could indicate a stiff valve or a problem with the motor of the Radiator thermostat II.

Steps to find a solution

To investigate the problem, please follow these steps:

1. Remove the Radiator thermostat II from the radiator valve.

2. Remove one battery from the battery compartment.

3. Insert the battery again and press the “O” button to confirm. If necessary, press the button again.

The calibration should now start.

If the E03 message appears

If the E03 message “Calibration failed” appears, please check that the radiator valve works properly. If necessary, consult a heating specialist.

If the E05 message is still displayed

If the E05 message persists, this could indicate a motor problem. In this case, please contact our

Customer Support

to discuss the next steps. We are here to help you!

The message E04 on the Bosch Smart Home Radiator thermostat II indicates that the motor is not working correctly. This can occur both during the initial installation and during ongoing operation.

Please first check whether the firmware of the device is up to date. To do so, open the Bosch Smart Home App and navigate to „More > Devices > Radiator thermostat > [affected device]“. If an update is available, please carry it out.

If the firmware is already up to date, briefly press the "O" button on the device. The Radiator thermostat then tries to fix the problem automatically. Should this not be successful after about six minutes, you can repeat the procedure once.

If the message E04 persists, this could indicate a motor problem. In that case please contact our customer service to discuss how to proceed. We are here to help you!

The message E03 displayed on your Radiator thermostat II means that the valve pin could not be moved completely during calibration. In many cases, this is because the device was not mounted correctly on the valve or an incompatible adapter is being used. In this case, please carefully check the installation and use our adapter check to ensure that the correct accessories are being used.

It may also happen that the radiator valve is stiff or slightly calcified. Try carefully checking whether the valve pin can be moved manually. To further narrow down the behavior, you can also test the thermostat on another radiator. A quick look at the batteries is also useful, as insufficient voltage can affect calibration.

If the message continues to be displayed, our customer service is happy to provide further support.

If your inspection reveals a problem with the radiator valve itself, please contact a heating specialist.

In rare cases, it may happen that the small black pin on the Radiator thermostat II falls out. This can occur both during operation and directly during initial installation.

If you notice this behavior with your device, please contact our customer service so that we can review the case individually and provide you with the best possible support.

The E05 message on your Bosch Smart Home Radiator thermostat II means that the plunger of the thermostat cannot move the valve pin on the radiator valve. This could indicate a stiff valve or a problem with the motor of the Radiator thermostat II.

Steps to find a solution

To investigate the problem, please follow these steps:

1. Remove the Radiator thermostat II from the radiator valve.

2. Remove one battery from the battery compartment.

3. Insert the battery again and press the “O” button to confirm. If necessary, press the button again.

The calibration should now start.

If the E03 message appears

If the E03 message “Calibration failed” appears, please check that the radiator valve works properly. If necessary, consult a heating specialist.

If the E05 message is still displayed

If the E05 message persists, this could indicate a motor problem. In this case, please contact our

Customer Support

to discuss the next steps. We are here to help you!

The message E04 on the Bosch Smart Home Radiator thermostat II indicates that the motor is not working correctly. This can occur both during the initial installation and during ongoing operation.

Please first check whether the firmware of the device is up to date. To do so, open the Bosch Smart Home App and navigate to „More > Devices > Radiator thermostat > [affected device]“. If an update is available, please carry it out.

If the firmware is already up to date, briefly press the "O" button on the device. The Radiator thermostat then tries to fix the problem automatically. Should this not be successful after about six minutes, you can repeat the procedure once.

If the message E04 persists, this could indicate a motor problem. In that case please contact our customer service to discuss how to proceed. We are here to help you!

The message E03 displayed on your Radiator thermostat II means that the valve pin could not be moved completely during calibration. In many cases, this is because the device was not mounted correctly on the valve or an incompatible adapter is being used. In this case, please carefully check the installation and use our adapter check to ensure that the correct accessories are being used.

It may also happen that the radiator valve is stiff or slightly calcified. Try carefully checking whether the valve pin can be moved manually. To further narrow down the behavior, you can also test the thermostat on another radiator. A quick look at the batteries is also useful, as insufficient voltage can affect calibration.

If the message continues to be displayed, our customer service is happy to provide further support.

If your inspection reveals a problem with the radiator valve itself, please contact a heating specialist.

In rare cases, it may happen that the small black pin on the Radiator thermostat II falls out. This can occur both during operation and directly during initial installation.

If you notice this behavior with your device, please contact our customer service so that we can review the case individually and provide you with the best possible support.

The E05 message on your Bosch Smart Home Radiator thermostat II means that the plunger of the thermostat cannot move the valve pin on the radiator valve. This could indicate a stiff valve or a problem with the motor of the Radiator thermostat II.

Steps to find a solution

To investigate the problem, please follow these steps:

1. Remove the Radiator thermostat II from the radiator valve.

2. Remove one battery from the battery compartment.

3. Insert the battery again and press the “O” button to confirm. If necessary, press the button again.

The calibration should now start.

If the E03 message appears

If the E03 message “Calibration failed” appears, please check that the radiator valve works properly. If necessary, consult a heating specialist.

If the E05 message is still displayed

If the E05 message persists, this could indicate a motor problem. In this case, please contact our

Customer Support

to discuss the next steps. We are here to help you!

The message E04 on the Bosch Smart Home Radiator thermostat II indicates that the motor is not working correctly. This can occur both during the initial installation and during ongoing operation.

Please first check whether the firmware of the device is up to date. To do so, open the Bosch Smart Home App and navigate to „More > Devices > Radiator thermostat > [affected device]“. If an update is available, please carry it out.

If the firmware is already up to date, briefly press the "O" button on the device. The Radiator thermostat then tries to fix the problem automatically. Should this not be successful after about six minutes, you can repeat the procedure once.

If the message E04 persists, this could indicate a motor problem. In that case please contact our customer service to discuss how to proceed. We are here to help you!

The message E03 displayed on your Radiator thermostat II means that the valve pin could not be moved completely during calibration. In many cases, this is because the device was not mounted correctly on the valve or an incompatible adapter is being used. In this case, please carefully check the installation and use our adapter check to ensure that the correct accessories are being used.

It may also happen that the radiator valve is stiff or slightly calcified. Try carefully checking whether the valve pin can be moved manually. To further narrow down the behavior, you can also test the thermostat on another radiator. A quick look at the batteries is also useful, as insufficient voltage can affect calibration.

If the message continues to be displayed, our customer service is happy to provide further support.

If your inspection reveals a problem with the radiator valve itself, please contact a heating specialist.

In rare cases, it may happen that the small black pin on the Radiator thermostat II falls out. This can occur both during operation and directly during initial installation.

If you notice this behavior with your device, please contact our customer service so that we can review the case individually and provide you with the best possible support.