The LevelControl measures the cylinder level via ultrasound. For this, it is necessary that the coupling pad of the device has clean contact with the bottom of the gas cylinder.
Suitable are upright (propane / butane – LPG) steel or aluminium gas cylinders with a diameter of 200 to 350 mm.
Depending on the cylinder type and age, there may be different obstacles to clean measurement.
Here are some examples of obstacles and the corresponding solutions:
Bottle heavily rusted/dirty
Due to the uneven surfaces caused by rust, the ultrasonic signal can no longer penetrate cleanly into the bottle. A measurement is therefore not possible.
In this case, it is recommended to mount the LevelControl in such a way that the coupling pad rests on a surface that is as smooth as possible. In severe cases, the only solution is to replace the bottle.
Bottle stand base too narrow
On such a bottle, the LevelControl has no place underneath. The bottle rests with its entire weight on the LevelControl and squeezes the coupling cushion. This also means that no measurement is possible.
The supplied feet or other distance blocks can provide a remedy.
Bottle base dented/flattened on the underside
If the LevelControl is attached to the centre of such bottles, the coupling pad no longer rests on the ground as desired. A measurement is therefore not possible at this point.
In this case, simply move the LevelControl a little out of the centre.
Tank bottles/gas tanks
Tank bottles have a special interior that enables refuelling (fuel indicator, etc.). This interior deflects the ultrasonic signal of the LevelControl so that no measurement result can be calculated and displayed.
The LevelControl cannot be used on such bottles/tanks.
Thanks to the customers who sent us the photos for better clarification.
The spanner in the lower right-hand area of the display is used to access the settings menu of the CPplus operating element. And it is here that you will find the menu item “Reset”. However, many people are unfamiliar with its function.
When the CPplus is delivered, it is completely blank with regard to the units to be controlled. The device memory is empty. During the vehicle conversion at the caravan or motor home manufacturer, the vehicle technology is implemented step by step into the body and at some point the gas supply and heating and air conditioning system from our company is also installed. In order to be able to operate and monitor all Truma devices, the device memory in the CPplus must finally be filled. And this is what the reset function is for. By pressing the control knob when “RESET” is shown on the display, I activate this function and “PRSET” appears. Press the control knob again to delete the unit’s memory. After this, “INIT” appears; all units connected to the CPplus with a TIN cable and supplied with voltage at the time of initialisation are now written into the unit memory of the CPplus. Only at this point can they be controlled with the operating element. All symbols belonging to the units are then stored on the display and can be selected.
Please note that a reset is never used to reset an error code. If, for example, the heater reports a gas error ( E506H, E516H or E517H), the reset automatically locks the control electronics of the heater for 15 minutes. If a reset is activated with the warning message W255H, which indicates that the control element has lost contact with the heater, then the CPplus is returned to the delivery state without a connected heater. In this case, the power supply of the heater and the TIN connection cable to the heater should be checked first.
In view of this, we would like to point out that many online portals and trading platforms offer accessory products and 3D files for the manufacture of components that are supposed to improve the function of our Truma devices or remedy side effects. These products may appear to be useful and may be of good quality, but in most cases they have not been tested, authorised or approved by us.
An example of this is the product known as the drip lip / drip guide or condensation drain for mounting on the flue of the Combi heater. It does not come from our company and its installation even invalidates the operating permit and warranty as an unauthorised modification to the appliance.
As described in our operating instructions and the installation instructions, no safety-relevant component may be changed. However, the side wall chimney and its individual components belong to this area. After such a change, the appliance may no longer be put into operation from a legal point of view. Interactions with the accessory product are unknown.
This circumstance can perhaps be compared to the installation of a sports exhaust system for a passenger car: if there is no expert opinion or ABE for the system, in which the vehicle model is not explicitly mentioned, then it is also not permitted to install it. Use on public roads is prohibited. If you are caught, you are also liable to prosecution for “driving without an operating licence”. The consequence is a trip to the TÜV and a fine.
In the case of the above-mentioned accessories, there is no mention of whether the material used can withstand the temperatures applied to the side wall chimney, nor is there any guarantee that the imperative openings for combustion air intake and exhaust gas disposal will be affected in any way. In such cases, for example, due to an incorrectly supplied amount of oxygen or reduced cross-section of the flue gas opening, the burner of your heating system may not work correctly and error messages may occur during heating operation.
In the worst case, damage to the vehicle may occur if, for example, the material of the accessory was not designed for the temperatures on the side wall chimney.
So if in doubt, please contact the Truma Service Centre, our authorised dealers or service partners. Here you can clarify whether such an accessory comes from our production and whether there are justified objections regarding its function or the effect on an existing approval.
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:
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.
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.
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.
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.
This is how you can see what the status of the system is or whether an update is pending.
open the Truma App – Settings – “iNet Box Update”
at the bottom you will see the version information
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.
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.
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.