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.

Combi D – Tips for avoiding sooting

There are ways to protect the burner of the Combi Diesel from soiling and sooting.

In contrast to the Combi Gas, which burns almost residue-free, residues can form and settle on the Combi Diesel during use. This happens mainly in part-load operation.

Part-load operation means a permanently low power level that is mainly used to maintain the temperature.

The reason for the formation of residues is the low combustion chamber temperature that exists in 2kW operation. Unburnt fuel from diesel injection is then deposited as soot particles on the components of the combustion chamber.

The next time the engine is started, this residue burns off. You can see this by the smoke developing on the outside of the chimney. If the Combi D runs only at partial load over a long period of time, coking can occur on the components of the combustion chamber –> the heating system stops working.

This can be compared to the short-distance operation of a diesel car. If the engine does not heat up properly, this is also harmful in the long run.

Just as you drive a diesel car on the motorway to burn out the engine, with the Combi D it is also necessary to keep the combustion chamber active for a longer period.

You can achieve this by setting the hot water heating to Hot/60°C. As soon as you see on the control panel that the temperature has been reached, drain the hot water completely from the boiler. Cold water flows in and the heating system is forced to restart the burner immediately. Repeat this procedure until an hour has passed.

Tip: The water does not have to be poured away. Just collect it, let it cool down and then fill it back into the freshwater tank 😉

If the heater is only needed for a holiday trip of 2 weeks, please carry out the procedure at the end of the holiday. If the heater is used more or less often, simply adjust the interval accordingly.

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.

2G shutdown – consequences for the Truma iNetBox

We are currently receiving many questions about the consequences of 2G switch-off in Switzerland.

What is 2G and why is it being switched off?

The abbreviation 2G stands for GSM mobile phone standard of the second generation. The mobile phone standard 2G was introduced in Germany in 1992. With each generation (3G, 4G) the transmission speed was improved. 4G (LTE) is currently the measure of all things and is sufficient for the transmission of large data within seconds.

Frequency ranges that are currently still occupied are required for the planned fifth generation of the radio and transmission standard. A replacement in the existing frequency range is therefore much cheaper than a complete new setup.

Why is 2G switched off in Switzerland and 3G in Germany?

Mobile networks are the property of the respective providers. Therefore this decision is up to them. Manufacturers who use 2G in their products have to comply.

Of course, the economy also has a certain influence on this decision. In Germany, for example, a large part of industrial applications rely on the 2G network, as this is the main means of control.

2G is easy to implement, secure, robust and “available everywhere”. This was also the status quo at the time of development of our Truma iNetBox.

Who is now affected by the shutdown and what happens next?

This is not so easy to answer. The Swiss mobile phone providers Salt and SwissCom have already announced a date for switching off the 2G mobile phone standard. There is also information and statements from other European countries regarding the switch-off of 2G. However, these change regularly.

If you have any information for us, please feel free to comment here below the article. We will also update our findings there.

Recently it was confirmed that Sunrise remains an alternative and will provide 2G until at least 2022.

https://www.sunrise.ch/en/medium-and-large-enterprises/products-and-solutions/connectivity/2G-weiterhin-nutzen-sunrise.html

In Germany, 2G will remain. Instead, it was decided to shut down 3G.

This leads to the following restrictions:

If you live in Switzerland or spend your vacations there, you can no longer use the remote control of the Truma iNetBox (if there are no alternative providers available, e.g. via roaming) because the box can no longer dial into the network.

Is there an adapter from 2G to 3G or higher?

Yes, for industrial applications there are now gateway solutions which are used as stand-alone devices to amplify the radio frequency. Unfortunately, this does not make sense technically and economically for the Truma iNetBox. Many companies are currently working on a cloud-based solution for their systems in order to be able to continue to use the service and function of mobile device control.

How is Truma dealing with this situation?

Truma informed its sales partners about the 2G switch-off and its consequences for the iNet Box at the turn of the year 19/20 via print and online channels.

A successor product is also being planned. However, there will be no upgrade of the existing devices.

Leave a comment now to enter into dialogue with us.

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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Truma Service over Christmas and New Year

Posted on 28. November 2019 by Monika Prandl

Service technicians on hand at six winter camp sites

Winter camping has its own special charm when it’s icy outside and snug and warm inside. But what if the heater breaks down? That would soon put an end to any holiday plans. But Truma makes sure that doesn’t happen. From 21 to 31 Dec. 2019 Truma service technicians will be on hand at six winter camp sites in Germany, Austria and Italy. Truma Service has a long tradition of being available over Christmas and New Year. “Our heating systems are very reliable,” says Service Manager Michael Suckart. “But just in case, our Service professionals are on hand so that our customers can enjoy carefree holidays.” As well as repairing appliances, the Truma experts give advice and answer questions about all our products.

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The fault 507, 516 or 517 appears in the display of the digital control panel CP plus – what must I do?

Remote control Truma CP plus

Remedy fault 507 / 516 / 517 (gas supply interrupted)

Note: If the fault 507, 516 or 517 is displayed in the heater’s control panel, switching the control panel on and off does not help. This does not delete the fault, but blocks the heater for 15 minutes. The heater is also blocked for 15 minutes if the fault 507, 516 or 517 is deleted four times without the gas supply being established.


Remedying flashing fault 507 / 516 / 517 (gas supply interrupted)

The fault code 507, 516 or 517 flashes because the heater is still in a 15-minute blocking time. This was possibly caused by the heater control panel being switched off or because the heater’s 12-Volt supply was interrupted. The heater is also blocked for 15 minutes if the displayed fault is deleted four times without the gas supply being restored.

  • Wait out the 15-minute blocking time for the heater. During this time, do not switch off the heater’s control panel and also do not interrupt the power supply.
  • As soon as the heater’s blocking time has expired, the fault is then displayed permanently rather than flashing. It can now be deleted as described in the point above.
     

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.