W255H in CP Plus display or no more symbols in display after reset

You see the warning message “W255H” on your CP plus display and cannot control your heating anymore?
This primarily indicates a connection problem between the CP plus and the heating. In this state, commands entered cannot be transmitted or cannot be transmitted correctly.

Attention!
A reset is not used to delete an error, but corresponds to an initialisation, i.e. a device search.
If the reset is carried out while there is a connection problem to the heating, the heating menu is completely lost. Only the time and the setup symbol remain.

Two factors can be considered as causes of the connection problem:

  1. 12 V power supply

Communication is only possible if the heater is powered in addition to the control unit. If this is not the case, the CP plus responds with the message W255H.
Please check the heating fuse in your electrical block as well as the fuse on the control board of the heating (Combi) or in the supply line (Varioheat). Replace a defective fuse if necessary.

Note: In our installation instructions, we recommend installing our units on permanent plus.
This means that the power supply to our units cannot be switched off by the central control element (main panel). There should be a permanent connection via the electrical block to the body battery.

  1. TIN connection cable

The TIN cable is used to transmit commands from the control panel to the heater. If this connection is interrupted, the CP plus responds with the message W255H.
Please check whether the plug of the TIN cable is correctly seated in the socket on both the control element and the control board of the heater.


As soon as the cause is eliminated, the warning message disappears automatically from the display.

New update for the Truma App (4.9.3) and Truma iNet Box (2.09.00)

  • We have added a few new features to the Truma LevelControl functions in the app. You can now easily initiate a new measurement. The result is also now shown together with the time of the measurement.
  • Alde heater owners can now activate / deactivate automatic climate control via SMS if they have a Truma air conditioning system installed.
  • We also have good news for all Combi D users:
    The “255H” and “164 H” bugs (continuous sending of SMS) have been fixed with this update and the heater can once again be used without restrictions.

Good2know:

This is how you can see what the status of the system is or whether an update is pending.

  1. open the Truma App – Settings – “iNet Box Update”
  2. at the bottom you will see the version information
  3. after the current update, these are:

Truma App version = current state of your app
iNet Box FW = Firmware version of your iNetBox
Server = available firmware version (update) on the Truma server
Local = firmware version, you have downloaded

If you have any questions or feedback, please use the comment function.
We look forward to exchanging ideas with you.

Truma iNetBox – What you ever wanted to know

Hello campers, do you have questions about Truma iNetBox? Just use the comment function. We will be happy to answer them.

The Power LED is permanently turned “green”. The GSM LED flashes “red”. Is that ok?

A: Everything is fine! -> As long as you have not yet completed the GSM setup, the red LED will continue to flash. If you have completed the setup, it will go out.

The box is permanently supplied with 12V, even if the main switch is set to “Off”. How can the box be switched off?

A: It is not intended to switch off the box, otherwise you will not be able to use the remote control. In case of a main switch you can connect the box to the corresponding circuit.

Do I need the box, even if I don’t have an app installed?

A: Box and APP are inseparably connected. Without an app you cannot use a box. You can also use the app on its own, the range of functions is accordingly smaller.

There is a new update for Box and App available? How do I find out which one I have and what is up to date?

A: Start the Truma App and go to “Settings\Truma iNet Box Update”, there you will find all information below the “START UPDATE” button.

Truma App version = Describes the current state of your app
iNet Box FW = Software version of your iNetBox firmware
Server = The available firmware version (update) on the Truma server
Local = Describes which firmware version you have downloaded

iOS13 connection problems

Since the iOS13 release, connection problems between iPhone/iPad and the Truma iNet Box occur. In the meantime, we have been able to identify two different issues – but have not yet been able to solve the problems, even in cooperation with Apple support.

Here you can find a detailed error description and technical information about the causes of the problems. As soon as we have new findings, we will keep you up to date in the Truma service blog and in the App News.

Have you had experiences that you would like to share with other users and us? Then use the comment function in our service blog! We look forward to exchanging ideas with you.

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Important information about the new Truma App release in March 2018

Integrate your Alde heater into the iNet System

Good news for Alde heater users. From April 2018, you will be able to integrate the Alde compact 3020 HE with new control panel into the Truma iNet System. All you have to do is connect the heater to the iNet Box.

  • This is great news above all for campers who use or would like to use a Truma air conditioning system or Truma LevelControl. You can now conveniently use all devices via the iNet System. From controlling the heater and air conditioning to using the automatic climate control and checking the gas level, all it takes is a single app.
  • The new version of the Truma App will be available from March 2018.

Important: Deactivate the automatic update function

  • Previously, Truma App users could download new releases to their smart phone and still have two months to install the new firmware onto the iNet Box via Bluetooth.
  • For the new update, the complexity of the project forced us to suspend this rule. This means that the two-month time frame does not apply for this release. You must update both your app and the iNet Box with the new firmware simultaneously.
  • If you have automatic updates activated in the Truma App, please deactivate this function and switch to manual updates. This will allow you to decide when you wish to install the update.
  • Otherwise, the app will perform the update automatically. If there is no Bluetooth connection to your iNet Box at this time, it will not be possible to update the firmware. The iNet Box will then no longer function until the new firmware is installed.
  • This is particularly important for campers who have parked their vehicle outside Bluetooth range and wish to use the iNet System.
  • For the next releases, the two-month time frame will apply as usual.

Do you have any questions? The Truma Service team will be happy to help.

Movers for caravans: what is important

You finally arrive at your holiday destination after a long journey. Now all you want to do is get the caravan set up and relax. If you want to position your caravan manually, you will need patience and high levels of physical strength. However, if you have a mover, you can simply manoeuvre your caravan safely into the correct position by remote control.

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The benefits of a manoeuvring tool

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No more empty gas cylinders

Gas cylinders have the annoying habit of becoming empty in the middle of the night. You can put a stop to this with the Truma DuoControl CS which automatically switches from the empty operating cylinder to the reserve.

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The Truma dual-cylinder gas pressure regulator automatically switches to the reserve cylinder. The integrated crash sensor allows you to operate the gas system safely even when on the road.

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Make optimum use of your air conditioning system in the caravan

With an air conditioning system from Truma you can always have exactly the temperature you want inside your vehicle. It is not only the cooling output that counts, there is another function of the air conditioning system that is equally as important: it can dehumidify the air reliably. The higher the room temperature, the lower the humidity should be, because the body can discharge excess heat much more easily when the room air is dry. A high level of humidity often feels oppressive.  The temperature and humidity level are perfectly aligned in all air conditioning systems from Truma.

Truma_Klimaanlage_optimal_nutzen_1000x750Even if the weather is tropical outside, you should only cool down your motorhome or caravanmoderately. Experts recommend only cooling the temperature by around six degrees. This even applies when it is 35°C in the shade. If the temperature difference between the inside and the outside is too large, then this can lead to circulatory problems and illness.

Here are more tips:

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