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The document number of these instructions can be found in the footer of every inside page and on the back page
The document number consists of
These instructions apply to the Truma CP plus control panel, referred to a CP plus below
Aventa eco and Aventa comfort are referred to as Aventa below
Truma iNet Box is referred to as iNet Box below About these instructions
These instructions are intended for users
To make the text easier to read, no gender-specific distinction is made
Symbol | Meaning |
| about dangers to persons |
![]() | Expert |
| Additional information to provide a better understanding or to optimise work processes |
| Symbol for an action. Something must be done here |
* | Optional parts |
(Fig. 3-1) | Reference to a picture e.g. Figure 3 - number 1 |
The CP plus[1] is used to control and monitor a Combi heater and/or a Truma air conditioning system The CP plus 1 acts as an interface to operate connected appliances via the Truma App and iNet Box
The CP plus1 is intended for installation in caravans and motor homes
Installation in boats is not permitted
To control the room temperature, the CP plus controls either the connected heater or air conditioning system When a new or replacement appliance (Combi (D), air conditioning system or Truma iNet Box) is connected to the bus system, repeat the procedure described in "Initial start-up"
If a heater and air conditioning system are connected at the same time, select the required mode, heater (HEATER) or air conditioning system (AC) before setting the room temperature Alternatively, you can activate the automatic climate control mode (AUTO), see "Service menu". The CP plus then switches automatically between heater and air conditioning system This ensures an almost even indoor temperature By default, automatic climate control is switched off
If the 230 V power supply (mains electricity) is interrupted, all functions associated with the air conditioning system or automatic climate control modes are deactivated and blanked out on the CP plus
The function of the Truma automatic climate control depends on correct installation Your Truma Partner will be pleased to advise you whether your vehicle is suitable
Requirements for the automatic climate control functioning as expected:
Truma Partners are trained in the correct installation of automatic climate control
You will find our authorised dealers / Truma Partners at www.truma.com
In addition to normal operation, a time switch can also be used A time switch can be set for all operating parameters To do this, set a start time (1) and an end time (2) In normal operation, outside the time control (B), the operating parameters that were set previously remain valid (A)
If you change a parameter during the timer interval, it will remain changed until the end time After this, the parameters are reset for normal operation
The timer repeats every 24 hours
Even when the CP plus is connected, the IR remote control can still be used to control the air conditioning system The CP plus detects all settings on the air conditioning system that were set via the IR remote control The IR remote control sends only the settings shown on your screen (no bidirectional communication)
Use only the CP plus time switch to define the start and end time of a required period
In app mode, the connected appliances and the Truma CP plus go to stand-by mode and wait for new commands from the connected iNet Box
When a new command is entered via the Truma App, the connected appliances and the Truma CP plus are activated with the specified values
When a new or replacement Truma iNet Box is connected to the bus system, repeat the procedure described in "Initial start-up".Then activate the app mode, see "App mode with iNet Box"
The time switch is disabled in app mode
The backlit screen shows the menu level The first icon flashes
Use the rotary push button to select menus in the menu bar and make settings
Symbol | Menu item |
![]() | Setting the room temperature |
![]() | Selecting the hot water level |
![]() | Selecting the energy type |
![]() | Selecting the fan level |
![]() | Setting the time switch |
![]() | Switching lighting on / off |
![]() | Error message |
![]() | Setting the time |
![]() | Service menu |
Turn the rotary push button clockwise
Turn the rotary push button anti-clockwise
Press the rotary push button
The backlit screen shows the setting level. The operating parameters of the selected menu item are shown in "Settings / values". Use the rotary push button to select and change setpoint and parameters; press the button to save these. Selected menu items flash.
Turn the rotary push button clockwise
Turn the rotary push button anti-clockwise
Press the rotary push button
Press the Back button
Saved settings and activated menu items are shown in the status line
If the power supply is interrupted, these settings are deleted (exception: stored appliances)
In order to perform the initial start-up, the following steps are required:
Once you have connected the Truma CP plus to the power supply, a start screen opens after a few seconds
The display changes between the time and the set room temperature
After a repair / retrofit, the procedure described under "Initial start-up" must be repeated
Special displays when commands are entered via the Truma App, IR remote control of the air conditioning system or CI bus (see "Special displays")
Switching on
Press the rotary push button
Switching off
Press the rotary push button for more than 4 seconds.
If you park your vehicle in an enclosed space or if you will not be using it for an extended period, during winter for example, you must switch off the CP plus
Switch on app mode
Ending app mode
If no commands are entered via the Truma App, app mode can be closed on the Truma CP plus
The saved values are then applied next time it is put into operation
The room temperature setting depends on the operating mode (HEATER, AC, AUTO) You must select the mode before setting the room temperature (This is unnecessary if just one appliance is connected to the CP plus) Each operating mode has its own adjustable room temperature range In other words, different room temperature ranges can be selected in heating, cooling or automatic mode
Mode | Adjustable temperature range |
Heater (HEATER) | 5 – 30°C (1°C increments) |
Air conditioning (AC) | 16 – 31°C (1°C increments) |
Automatic climate control (AUTO) | 18 – 25°C (1°C increments) |
During heating / cooling, you can change the temperature quickly on the stand-by screen, using the rotary push button without opening the menu
Special features in air conditioning (AC) and automatic climate control (AUTO) modes
If the 230 V power supply (mains electricity) is interrupted, all functions associated with the air conditioning system or automatic climate control modes are deactivated and blanked out on the CP plus With automatic climate control, the Combi / Combi D is deactivated, even in heating mode When the 230 V power supply is restored, the Combi does not start automatically
Room temperature in heater mode (HEATER)
Symbol | Displayed text | Description |
![]() | Heater is switched on |
To switch the heater off, select the temperature range below 5°C (OFF)
Room temperature in air conditioning mode (AC)
Symbol | Displayed text | Description |
![]() | COOL | Air conditioning system is switched on |
![]() | AUTO (Circulated air) | Air conditioning system is set to automatic: circulated air level is selected automatically according to the cooling capacity Symbol flashes until the desired room temperature is reached |
![]() | HOT* | Air conditioning system is in heating mode |
![]() | VENT | Air conditioning system is in circulating air mode |
* Available only with some air conditioning systems
Room temperature in automatic climate control mode (AUTO)
Symbol | Displayed text | Description |
![]() | AUTO (ACC) | Automatic climate control is switched on |
Use the rotary push button to select in the menu line
Symbol | Displayed text | Description |
![]() | OFF | Water heating is switched off |
![]() | ECO* | Hot water temperature 40°C |
![]() | HOT | Hot water temperature 60°C |
![]() | BOOST | If room heating and water heating are switched on together, the heater is deactivated for 40 minutes. This ensures that the water is heated quickly (water has precedence). When the water temperature is reached, room heating begins again. |
* Hot water temperature may exceed 40°C with combined room and water heating Not available for the Australian variants
flashes until the required water temperature is reached
The energy supply for the heater can be adjusted to suit the available energy types (parking area, camp site, while driving)
The "Select energy type" menu is displayed only if a heater with electric heating elements is connected, for example Combi E CP plus ready
Depending on the ambient temperature, electrical heating power alone might not be sufficient to reach the specified room temperature Switch to mixed or gas mode to increase the heating power
The specified room temperature is reached quickest in mixed mode
Symbol | Operating mode | Energy type |
![]() | GAS / DIESEL | Gas / Diesel |
![]() | MIX 1 | Mixed mode Electric (900 W) + Gas / Diesel |
![]() | MIX 2 | Mixed mode Electric (1800 W) + Gas / Diesel |
![]() | EL 1 | Electric (900 W) |
![]() | EL 2 | Electric (1800 W) |
When the heater is switched on (room temperature, hot water level active), the status line shows the energy type selected in the previous heating procedure The factory setting is gas / diesel
Special features in mixed mode
Combi Gas
The heater switches automatically to electric mode For the heater to operate in mixed mode again, rectify the cause of the malfunction and acknowledge it on the Truma CP plus See "Troubleshooting guide".
Combi Diesel
The heater shows a malfunction For the heater to operate in mixed mode again, rectify the cause of the malfunction and acknowledge it on the Truma CP plus Switch to "Electric" energy mode if the malfunction persists
Special features in electric mode
The fan is an additional function to the selected mode, heater (HEATER), air conditioning (AC) or automatic climate control (AUTO) The CP plus activates the fan of the appliance that is operating at the time (heater or air conditioning) Each connected appliance has its own fan modes
The fan can also be operated without heating or cooling (VENT)
Fan modes with heater / water heating / air conditioning switched off
Symbol | Displayed text | Description |
![]() | OFF | Fan is switched off |
Fan modes in heater mode (HEATER)
Symbol | Displayed text | Description |
![]() | ECO | Low fan level |
![]() | HIGH | High fan level |
![]() | BOOST | Rapid room heating is available if the difference between the selected and current room temperatures is more than 10°C |
When the heater is switched on (room temperature, hot water level set), the status line (2) shows the fan mode that was selected the last time the heater was running The factory setting is "ECO"
Fan modes in air conditioning mode (AC)
Symbol | Displayed text | Description |
OFF | Fan is switched off. (can be selected only if no appliance is in operation). | |
![]() | LOW | Low fan level |
![]() | MID | Medium fan level |
![]() | HIGH | Highest fan level |
![]() | NIGHT | Ultra-quiet fan operation |
Fan modes in automatic climate control mode (AUTO)
Symbol | Displayed text | Description |
![]() | AUTO | Automatic fan level selection. Cannot be changed in AUTO mode. |
Only "ECO" is available for heaters
If the 230 V power supply (mains electricity) is interrupted, all functions associated with air conditioning system or automatic climate control modes are deactivated and blanked out on the CP plus
Available only if an air conditioning system is connected together with a room air distributor and dimmable LED ambient lighting
In 12h mode: A: am, P: pm
Risk of poisoning from exhaust gases The activated time switch switches the heater on even when the vehicle is parked without supervision The heater's exhaust can be toxic in enclosed spaces (eg garages, workshops)
If the vehicle is parked in closed rooms:
When the air conditioning system is operating, the CP plus time switch must be used only to define the start and end times for a required period
If the time switch is activated (ON), the "Deactivate time switch" menu (OFF) is displayed first
Enter the start time
Enter the end time
If the start/end point was exceeded during entry, the operating parameters will not apply until the next start/end point is reached Until then, the operating parameters that have been set outside the time switch remain valid
After this, you can set the following menu items that are within the switching interval:
Calibrating the room temperature sensor of the heater (OFFSET)
The room temperature sensor of the heater can be individually adjusted to the sensor's installation situation
The setting can be made in increments of 05°C from 0°C to -5°C
Example:
Set room temperature 23°C;
OFFSET = -1°C;
Default setting: 0°C (Celsius)
AC SET1,2
The sensed room temperature can – during operation of the automatic climate control – be perceived differently during cooling than during heating "AC SET" is used to set an offset between cooling and heating The setting can be made in increments of 05°C from 0°C to +5°C
Example:
Set room temperature 23°C;
AC SET = 2°C
Default setting: +1°C (Celsius)
1 Available only if an air conditioning system and heater are connected
2 Available only if ACC is set to "ON"
ACC1
The automatic climate control function AUTO is activated or blocked with "ACC"
ON
OFF
Default setting: OFF
°C / °F temperature display
Select the temperature display °C (Celsius) or °F (Fahrenheit)
Default setting: °C (Celsius)
Changing the background lighting
Change the background lighting of the Truma CP plus in 10 levels
12 h / 24 h mode
Display time in 12 h (a m, p m) / 24 h mode
Default setting: 24 h mode
Changing the language
Select the desired language (German, English, French, Italian)
Default setting: English
Displaying the version number
Display the version number of the heater, air conditioning system, Truma CP plus or iNetBox
Example: H 12001 -> H = Appliance; 12001 = Version number
Appliance
C = Truma CP plus
F = CP plus CI-BUS
A = Air conditioning system
H = Heater
T = Truma iNet Box
Default setting (RESET)
The reset function resets the CP plus to the default setting This deletes all settings Newly connected appliances are detected and stored in the Truma CP plus
Reset
After confirmation, the CP plus initialises itself "INIT " appears on the display while this is in progress
230 V power supply available
The symbol indicates that a 230 V power supply (mains electricity) is available on the connected heater and/or air conditioning system
Truma App with iNet Box
When a command is sent via the Truma App from a mobile device, "APP" is displayed
Infrared (IR) remote control (air conditioning system)
When a command is sent via the infrared remote control of the air conditioning system, "IR" is displayed
External control panel (CI-BUS)
When a command is sent via an external control panel with CI-BUS, "CI" is displayed
The CP plus CI BUS is a separate variant that is equipped only in the factory
indicates that an operating parameter has reached an undefined state In this case the appliance concerned continues to operate When the operating parameter is within the target range again, this symbol goes off again automatically
Reading out the warning code
Cause eliminated / return to the setting level
Cause not eliminated / return to the setting level
In this case, the warning is not acknowledged in the CP plus and the warning symbol remains The affected appliance remains in warning status Other connected appliances can be operated
In the event of a malfunction, the CP plus immediately goes to the "Malfunction" menu level and displays the relevant fault code Use the troubleshooting guide to determine and rectify the cause of the malfunction
E = Malfunction
112 = Fault code
H = Appliance
H = Heater
A = Air conditioning system
Cause eliminated / return to the setting level
This can take several minutes due to the internal after-runs of connected devices
If the cause has not been remedied, the malfunction will occur again and the CP plus will go to the "Malfunction" menu level again
If the fault code flashes in the control panel display, this cannot be reset until up to 15 minutes have elapsed
Cause not eliminated / return to the setting level
In this case, the malfunction is not acknowledged in the CP plus and the warning symbol remains The appliance remains in malfunction state Other connected appliances can be operated
The CP plus requires no maintenance Use a damp, non-scouring cloth to clean the front panel If this is not sufficient, use a neutral soap solution
Screen | LCD, monochrome, with background lighting |
Dimensions (L x W x H) | 92 x 103 x 40 mm |
Operating temperature range | -25°C to +60°C |
Storage temperature range | -25°C to +70°C |
Interfaces CP plus | TIN bus |
CP plus CI BUS Power supply | TIN bus, CI bus 8 V – 16.5 V DC |
Power consumption | max. 65 mA (100% background lighting) 6.5 mA – 10 mA (stand-by) |
Quiescent current consumption | 3 mA (Off) |
Weight Protection class | approx. 100 g Class III |
Protection type | IP00 |
Subject to technical changes
If these measures do not remedy the malfunction or if fault codes are displayed that you cannot find in the troubleshooting guide, contact Truma Service.
Heater Combi / Combi E (H)
Fault code | Cause | Remedy |
W 17 H | Water overheat condition (woc) | Switch heater off and allow it to cool. Fill the water container with water |
W 18 H | Air overheat condition | |
Not all warm air ducts are connected | Make sure that all warm air ducts are connected to the heater | |
Warm air outlets blocked | Check whether the warm air ducts are damaged or kinked | |
Circulated air intake blocked | Remove the blockage in the circulated air intake and ensure that the installation space is sufficiently ventilated | |
W 24 H | Imminent low voltage / battery voltage too low < 10.4 V | Check the function with the motor running, check the power supply unit or other batteries. Charge battery and check contacts, replace old battery |
E 29 H | Power consumption of the FrostControl heating element too high | Replace FrostControl heating element |
W 42 H | Window switch detects open window | Close window above cowl |
E 43 H | 12 V power supply faulty (overvoltage) | Check the 12 V power supply at the appliance input under load; to test, disconnect the power supply unit and the solar system from the on-board power supply |
W 45 H | 230 V power supply faulty | Check the 230 V power supply at the appliance input |
Have an expert check the 230 V fuse and replace it if necessary | ||
Reset the 230 V overheating protection (see Combi operating instructions) | ||
E 111 H | Fault in the electronics | Check the 12 V power supply at the appliance input under load; to test, disconnect the power supply unit and the solar system from the on-board power supply |
E 112 H, E 121 H, E 122 H, E 202 H, E 211 H, E 212 H | Flame out or not detected, Flame unstable during operation, Gas supply interrupted | Check that the gas supply has the correct operating pressure (see Fault catalogue, gas supply) |
E122H | Lack of fuel due to low tank level, tank is empty and / or vehicle is on a slope | Fill tank with fuel and then fill the fuel line (see operating instructions / initial start-up) |
W 255 H | Heater has no 12 V power supply | Check the 12 V power supply at the appliance input; to test, disconnect the power supply unit and the solar system from the on-board power supply |
No connection between heater and control panel | Check the control panel cable and make sure there is connection between the heater and the control panel | |
W 301 H, W 417 H | 12 V power supply faulty (overvoltage) | Check the 12 V power supply at the appliance input; to test, disconnect the power supply unit and the solar system from the on-board power supply |
W 302 H, W 418 H | 12 V power supply faulty (low voltage) | Charge battery and check contacts, replace old battery |
W 303 H, W 411 H | Risk of low voltage. Battery voltage too low < 10.4 V | Check the function with the motor running, check the power supply unit or other batteries. Charge battery and check contacts, replace old battery |
W 401 H | Hot water mode with empty water container | Switch heater off and allow it to cool. Fill the water container with water |
W 402 H | Air overheat condition | |
Not all warm air ducts are connected | Make sure that all warm air ducts are connected to the heater | |
Warm air outlets blocked | Check whether the warm air ducts are damaged or kinked | |
Circulated air intake blocked | Remove the blockage in the circulated air intake and ensure that the installation space is sufficiently ventilated | |
W 407 H | 230 V power supply faulty | Check the 230 V power supply at the appliance input |
Have an expert check the 230 V 10 AF, H fuse and replace it if necessary | ||
W 408 H | Gas supply interrupted in mixed mode | Check that the gas supply has the correct operating pressure. Start the heater in gas mode, acknowledge the fault and switch to mixed mode |
W 412 H | Window switch detects open window | Close window above cowl |
E 507 H, E 516 H, E 517 H | Gas supply interrupted | Check that the gas supply has the correct operating pressure (see Fault catalogue, gas supply) |
E 607 H | Maximum number of fault resets reached / after more | Wait 15 minutes and reset fault |
E 621 H | than 4 resets within 15 minutes, the heater is blocked Room temperature sensor or cable faulty | Check the cable for the room temperature sensor and plug connections Replace the room temperature sensor |
E 624 H | FrostControl heating element has a short circuit | Replace FrostControl heating element |
E 632 H | 230 V overheating protection has triggered | Reset the 230 V overheating protection (see Combi operating instructions) |
Heater Combi D / Combi D E (H)
Fault code | Cause | Remedy |
E 111 H | Room temperature sensor or cable faulty | Check the cable for the room temperature sensor and plug connections |
E 121 H | Interruption in the metering pump – temperature switch has triggered |
|
E 122 H | Lack of fuel due to low tank level, tank is empty and / or vehicle is on a slope |
|
E 131 H | No connection between heater and control panel | Connect the heater and the control panel |
E 132 H | FrostControl heating element has a short circuit | Ensure 12 V power supply under load at appliance input / check for AC voltage components (disconnect power supply unit and solar system from on-board power supply) |
W 150 H | Warm air temperature exceeded |
|
W 151 H | Water temperature exceeded in heater mode |
|
E 152 H | Water temperature exceeded in hot water mode | Switch heater off and allow to cool, fill water container with water |
W 160 H W 161 H | 12 V power supply faulty (low voltage) |
|
E 162 H | Window above cowl open (window switch) | Close window above cowl |
W 163 H | One of the temperature switches has opened | Allow the heater to cool. If this occurs frequently, contact Truma Service |
W 164 H | 230 V power supply faulty |
|
W 170 H | Imminent low voltage < 11.5 V |
|
W 255 H |
|
|
|
| |
W 301 H, W 417 H, E 540 H | 12 V power supply faulty (overvoltage) | Ensure 12 V power supply under load at appliance input / check for AC voltage components (disconnect power supply unit and solar system from on-board power supply) |
W 302 H, W 418 H, E 541 H | 12 V power supply faulty (low voltage) |
|
W 303 H, W 411 H | Risk of low voltage. Battery voltage too low < 10.8 V |
|
W 423 H | Initial filling required (filling function at initial start-up) | Activate initial filling by setting a heating request with temperature settings 30°C |
W 424 H | Initial filling active – after initial filling, the heater automatically switches to normal operation with a temperature setting of 30°C | Do not switch the heater off or interrupt the power supply during initial filling |
E 560 H | Heater will not start. Note: The device is locked after the fifth acknowledgement of the error message. | Check the fuel supply at the appliance input |
E 561 H | Cannot restart heater. Maximum number of start attempts reached – operating lock is activated. | Contact Truma Service |
E 565 H | Heater will not start, flame repeatedly not detected. One more repeat start for initial filling possible | Check the fuel supply at the appliance input |
Air conditioning system (A)
Fault code | Cause | Remedy |
E 8 A, W 8 A | IR receiver unplugged or cable broken | Check the connection of the IR receiver |
E 17 A, W 17 A | Voltage dip at 230 V power supply | Check 230 V power supply |
Only competent, trained personnel (experts) may install and repair the Truma product and carry out the function check with consideration of the installation and operating instructions and the current recognised rules of engineering Skilled personnel refers to persons who are capable of properly carrying out the necessary work and recognising possible hazards based on their specialist training and education, their knowledge and experience with Truma products and the relevant standards
For experts only
Do not install, dismantle or reposition the device on your own.
Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
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