Stay cool – tips for your air conditioning system

Make the most of your Truma air conditioning system with these few simple tips!

1) Vent your recreational vehicle before switching on the air conditioning system to guarantee fast cooling.

2) Close all windows and doors during operation.

3) Park your vehicle in the shade if possible.

4) Additional insulation, e.g. windows films or protective films prevent the vehicle from heating up.

5) If possible, cover any skylights and windows from outside, as these only cause the temperature inside the vehicle to increase.

6) Clean your roof regularly, because a clean roof does not heat up as quickly.

7) Ensure that there is enough air circulation below the vehicle by means of sufficient openings to prevent air build-up, e.g. attachment of skirt boards.

8) Do not select an inside temperature that differs too greatly from the outside temperature as this strains the body. The cleaning and dehumidification of the air generates a pleasant room climate even when the temperature differenceFlusenfilter_Frostair_1700_40040_13800 is low.

9) Replace the air filter of your Aventa every year. If you have a Saphir, replace the particle filter once a year and clean the fluff Partikelfilter_Saphir_40090_58100 filter twice a year or as necessary. Thanks to the closed cooling circuit, the Truma air conditioning systems are practically maintenance-free, e.g. no coolant needs to be refilled or replaced.

Reliable operation of the Truma S-heater

The heater is supplied with gas via a special connection (1). This is either ignited via a battery-operated auto ignition kit (2) or mechanically at the push of the button via the Piezo ignitor in the burner (3). Via the Mica window (4) it is possible to check whether the gas has ignited. External air is sucked into the heater via an inlet (5) and heated via the open flame in the burner (3). The hot air flows through the S-shaped heat exchanger (6) and escapes into the atmosphere together with the exhaust combustion gases via the exhaust pipe (7) and the roof cowl (8). Thanks to the thermo-electrical safety pilot and the fact that the system is completely closed, this process is 100% safe. The heat exchanger (6) heats the direct ambient air in the heater casing. It escapes into the living space through the lamellae of the covers and is distributed within the caravan via the fan (14) as required.

The temperature of the heater can be set steplessly and manually via the control panel knob (9), which activates the safety pilot valve (12) via the control panel rod (11). Once the required room temperature has been reached, a thermostat sensor (13) controls the gas supply to the burner and weakens it accordingly. The fan is controlled via a second control knob (10).

Schnittmodell_Heizung_Truma S 3004_DE.jpg

The electrical ancillary heater Ultraheat (15) is an ideal extra for all those who want to use additional electrical heating to heat up their vehicle very quickly independently of the gas system. It heats very quickly and uses the fan of the S-heater to distribute the warm air efficiently in the caravan.

Optimum power supply for the Truma Mover®

WW_XT_Steg_2To ensure that the Mover® is ready for use at all times, a reliable power supply must be guaranteed, preferably the AGM batteries with round cell technology. If the Truma Mover® PowerSet is used, the operating time can be extended by up to 50%. It is made of high-quality components which are perfectly matched to the Truma Mover (charger, battery OPTIMA® YT S 2.7 (38 Ah), battery cut-out, temperature sensor and cable set). The drive and lighting batteries are also suitable for the Mover®, e.g. gel batteries or AGM-batteries with round cell technology.

Tipp: If the caravan is not used for a longer period of time, you should always disconnect the connection to the battery via the cut-out as otherwise the battery will deep discharge and suffer damage. In the new Mover® XT the main control system switches off automatically after an hour of non-use.

To store your batteries carefully over the winter it makes sense to remove the battery from the vehicle and place it in a dry and cool place. The battery should always be stored when fully charged and should be recharged every two months (24 hours). For more information about handling batteries correctly, please see the section on tips and tricks.
Solarset 23_Batterieerhaltungsladeset_stehend_74102_01_jpg72

Tipp: The Truma SolarSet 23 protects the battery against deep discharging.


Functional principle of the motorcaravan heater Truma Combi

The heater is started on the Truma Combi LCD control panel (1) and the required temperature for the heater and warm water is set. The heater is connected to the vehicle’s gas supply via the gas connection (2). The gas supply to the heater is controlled via the solenoid valve (3). The required combustion air enters the device via the external pipe of the combined combustion air/exhaust gas cowl (4) where it is transported to the gas burner (6) via the combustion air burner (5). The gas burner, which is equipped with two igniter plugs (7) and a flame rectification electrode, ignites the gas-air mix in the combustion chamber (8).

The hot exhaust gases are deflected at the end of the combustion chamber on the baffle plate of the flame tube (9) and flow back between the flame tube of the burner and the inner wall of the heat exchanger. They escape into the atmosphere via the exhaust gas cowl (4).

The circulating air fan (10) sends the air that is to be heated into the inside of the device. This air flows along the ribs of the heat exchanger (11) that, thanks to its large transfer surface, ensures optimum heat transfer. There are also additional electrical heating rods (12) with 1,800 Watt inside the heat exchanger that can be used to either heat the water and/or warm air. Then the warm air is distributed throughout the vehicle via four warm air outlets (13).

The fresh water is kept in the outer stainless steel water tank that has a volume of 10 litres (14). It is heated from here via the transfer of heat from the heat exchanger (11). Thanks to the eccentric shape of the water tank, the warm water is circulated ensuring an optimum mix and better temperature layering. The warm water connection pipe (15) connects the Truma Combi to the warm water pipes in the kitchen and bathroom. Cold water is pumped from the fresh water tank via the cold water connection pipe (16).

Schnittmodell_Truma Combi_DE.jpg

The room temperature sensor (17) fitted in the vehicle measures the air temperature in the vehicle. Also, the water temperature is measured using the internal temperature sensor. Before the required heater and water temperature is reached, the device reduces the heating output. Once the set temperature has been reached, the burner shuts down. If the set heater and water temperatures are undercut, the Truma Combi automatically restarts to heat up the air and water (winter mode). In summer mode, the warm water heater can be operated separately from the heater. The HDF thermal sleeve (18) ensures good insulation of the Truma Combi-heater.



Mover® XT – Useful tips for remote control and disconnection of control unit

The remote control should always be switched off, using the slide switch at the side after operation in order to minimize battery power consumption.

Symbolleiste der Mover XT Fernbedienung

Symbols of remote control Mover® XT

The remote control performs a self-test after switching on. It is important that neither the rotary switch, the slide switch nor a pushbutton is pressed when this occurs, since zero calibration can otherwise not take place. (Switch off the remote control, discard and wait briefly until the self-test is carried out)

If the remote control is not used for longer than 1 minute, the green symbol for switch on in online condition, which flashes four times and comes along with an acoustic sígnal, disappears. To activate the system, switch the remote control off and on again.

Here one more tip in case the system shuts down:

If the systen is not used for longer than an hour a disconnection of the control unit takes place. (Economy measure) The system has to be made electro less to activate it again. (By using the circuit breaker or disconnect the positive pole of the batterie).

Mover XT – LED 3 of remote control flashes 4 times

If the remote control emits an acoustic signal four times after beeing switched on and the red warning triangle (LED 3) flashes four times at the same time, the cause therefor could lie on the batteries, the battery voltage or on the remote control itself.

We recommend the following procedure in order to narrow down the cause.

1. Check that rotary switch and slide switch are in neutral position.

2. Check batteries of remote control (voltage) and replace if necessary.

The battery voltage of the remote control must be greater than or equal to 3,6 V (3 x 1,5 V AAA batteries). If rechargeable batteries are being used, it must be noted that because of the lower voltage of the rechargeable battery (3 x 1,2 V) the remote control is operated right at the limit and the rechargeable batteries have to be replaced or charged at frequent intervals!

3. Check battery quality.

Please use only high quality, leak-proof batteries with steel casing. Low-cost  batteries with a simple aluminium casing are not leak-proof and may also cause problems in the remote control.

4. Check software version.

The error could also appear with software version 1. The software version (HW 1 or HW 2) can be identified on the label above the batteries.

Should the software version be HW 1 or the above mentioned actions do not show any success, please contact our service.



Can gas cylinders be connected when on the road?

Connected gas cylinders are classified as operating media and not hazardous substances (ADR release in compliance with sections and e). Gas cylinders that are not connected to gas installations always need to be closed and be fitted with protective caps.

The Truma gas remote switch allows the entire gas supply to be switched off comfortably from inside the vehicle at the push of a button. This does away with the need to go to the cylinder box and manually close the gas cylinders.

Truma Gasfernschalter

Truma gas remote switch

Retrofitting the control panel Truma CP Plus – what do I need to know?

The LCD display control panel CP Plus can always be retrofitted in all Truma Combi heaters. It cannot be fitted into older heater models, e.g. the C-heater.XXX

The Combi heaters were launched by Truma in 2007 and can be recognised by the grey casing. From series start in the year 2013 the models have a black casing.

Do the electronics need to be replaced when fitting the CP Plus?

If you already have a Truma Combi heater with the appropriate software version, so only the old control panel need to be replaced with the new one (see installation instructions and user manual.

How can I see whether the electronics of the Combi need to be replaced?

Combi Totale(markiert)


Via the software version of the electronics. To do this, please remove the clipped on part of the electronics cover (see picture left ). You do not need tools for this.



Platine Nah(markiert)


You should now be able to see the part of the PCB to which the positive and negative cable is fitted. There is a sticker here that states the software status of the electronics (see picture on the right).



The table below shows which software status is required for which Combi model..ServiceblogTabelle CPPlus

Oil leakage on the Mover Gear Unit following Assembly/Replacement

An oil leak discovered in the gearbox following assembly of your Mover or replacement of the gear units, does not constitute a defect but rather results from the Transport and/or assembly.XXX


The oil leakage in the gearbox is caused by the fact that the Mover gearbox is somtimes turned several times during assembly, transport and installation under the caravan, causing the lubricant Continue reading

Gas testing certificate – this is important when buying or hiring a camping vehicle!

If you are looking to buy a second-hand camping vehicle or hire a vehicle, please note the following with regard to the gas supply:

Carefree holidays with hired vehicles.

Carefree holidays with hired vehicles

Carefree holidays with hired vehicles. XXX
Always check that the gas system has been tested and has a valid gas testing certificate. This testing certificate may only be completed and signed by a gas expert. In addition to the testing certificate, a test plate in compliance with G607 is attached to the outside of the vehicle, assuming that it has passed the inspection (see figure bottom right).
Also check whether the gas system can be operated whilst the vehicle is driving. If there is no safety lock (like the Truma crash sensor) in the vehicle, the heating cannot be operated when on the road.

Gas test plate attached to the vehicle

Gas test plate attached to the vehicle

Gas test plate attached to the vehicle
In this case the valves on the gas cylinders need to be closed. A warning sticker attached to the gas cylinder box states that the gas cylinders need to be closed when the vehicle is on the road.