• What is a Truma CP Plus?

  The Truma CP Plus is a digital control panel used in conjunction with Truma heating and air conditioning systems for Motorhomes and caravans. Truma is a reputable manufacturer of various comfort systems designed for mobile living, particularly in the camping and Motorhome industry.

  The Truma CP Plus control panel serves as the user interface for controlling and monitoring the Truma heating system installed in your Motorhome. It offers a range of functions and features to enhance the comfort and convenience of your mobile living space. Here's what the Truma CP Plus typically does:

  **Temperature Control:** The CP Plus allows you to set and adjust the desired temperature for your Motorhome's interior. You can specify the temperature you want the heating system to maintain, ensuring a comfortable environment regardless of the outdoor conditions.

  **Operating Modes:** The control panel lets you switch between different operating modes, such as heating, cooling (if your system includes air conditioning), and automatic mode. This allows you to adapt to changing weather conditions and your preferences.

  **Fan Speed Control:** You can adjust the fan speed to regulate the distribution of heated or cooled air throughout your motorhome. This helps maintain an even and consistent temperature throughout the space.

  **Energy Source Selection:** If your Truma system supports multiple energy sources (such as electricity and propane), the CP Plus enables you to choose the desired source based on availability or preference.

  **Timer and Programming:** Some Truma systems offer timer and programming functionalities, allowing you to set specific times for heating or cooling to optimize energy usage and comfort.

  **System Monitoring:** The CP Plus provides real-time information about the status of your heating or cooling system, including diagnostic codes and alerts in case of issues. This helps you troubleshoot and address any potential problems.

  **Integration and Connectivity:** Depending on the model and features, the Truma CP Plus may offer connectivity options, such as smartphone apps or remote control capabilities, allowing you to manage your motorhome's climate control remotely.

  **User-Friendly Interface:** The control panel is designed to be user-friendly and intuitive, with easy-to-understand buttons, icons, and menus, making it accessible for both beginners and experienced motorhome enthusiasts.

  In summary, the Truma CP Plus is a central control unit that empowers you to personalize and manage the indoor climate of your motorhome with ease. It provides control over temperature settings, fan speeds, energy sources, and operating modes, enhancing your comfort and convenience while on the road or at your favorite camping site. Keep in mind that the specific features and functionalities may vary depending on the Truma system model and configuration you have in your motorhome.

Label	Description	Function
1	Control Panel	The main display to give the user a graphical interface
2	Status line	Display that provides information about the current operating state or condition of the heating system. It might show whether the heater is on or off, the temperature setting, any error codes or messages
3	Menu line (top)	On a Truma heating control likely refers to the primary display area where key information or settings are shown. This could include details such as the current temperature, operating mode (e.g., heating, cooling, standby), fan speed, timer settings.
4	Menu line (bottom)	On a Truma heating control is typically a secondary display area that provides additional information or options related to the heating system. This area might show secondary settings, alerts, maintenance reminders, or other relevant details.
5	Power supply display (mains supply)	The "mains supply icon" on a Truma heating control typically refers to an indicator that shows whether the heating system is currently connected to an external electrical power source, often referred to as "mains power"
6	Time switch display	This will show you the start and end times of your program
7	Settings / Values	This will show you what settings your making in the various functions.
8	Rotary push button	This button allows you to move to the disired part of the application, select and change the settings by pushing to select and rotating to change or move around the screen
9	Back button	This back button returns you back to the home screen or exits and menu you are currently in.

---

An error code is shown on the display of my digital CP plus control panel – how do I find out what it means?

---

Troubleshooting guide (Combi gas heater)

Fault Code	Cause	Remedy
#17	Summer mode with empty water container	Switch heater off and allow to cool. Fill boiler with water
#18	Warm air temperature exceeded: - Not all warm air ducts are connected - Warm air outlets blocked - Circulated air intake blocked	- Check whether the 4 warm air ducts are connected - Check the individual outlet openings - Remove the circulated air intake blockage
#21	Room temperature sensor or cable faulty	Inspect the room temperature sensor cable, replace if faulty Check the resistance of the room temperature sensor. 15 °C – 16.2 kOhm / 20 °C – 12,6 kOhm / 25 °C – 10.0 kOhm Replace room temperature sensor if faulty
#24	Risk of low voltage. Battery voltage is too low < 10.4 V	Charge battery
#29	Frost Control heating element has a short circuit	Disconnect heating element plug from electronic control unit. Replace heating element
#42	Open window above cowl (window switch)	Close window.
#43	Overvoltage > 16.4 V	Check battery voltage / voltage sources such as the charger
#44	Low voltage. Battery voltage is too low < 10.0 V	Charge battery. If necessary replace old battery
#45	No 230 V operating voltage, 230 V fuse defective, Overheating protection has been triggered	Restore 230 V operating voltage Replace 230 V fuse (see Combi operating instructions) Reset overheating protection (see Combi operating instructions)
#112	Gas cylinder empty	Replacing a gas cylinder

Fault Code	Cause	Remedy
#255	Heater has no 12 V power supply No connection between heater and control panel	Ensure 12 V power supply Make connection between heater and control panel

Fault Code	Cause	Remedy
#255	Heater has no 12 V power supply No connection between heater and control panel	Ensure 12 V power supply Make connection between heater and control panel
#301	Overvoltage > 16.4 V	Check battery voltage / voltage sources such as the charger
#417	Overvoltage > 16.4 V	Check battery voltage / voltage sources such as the charger
#302	Low voltage. Battery voltage is too low < 10.0 V	Charge battery. If necessary replace old battery
#418	Low voltage. Battery voltage is too low < 10.0 V	Charge battery. If necessary replace old battery
#303	Risk of low voltage. Battery voltage is too low < 10.4 V	Charge battery
#411	Risk of low voltage. Battery voltage is too low < 10.4 V	Charge battery
#401	Summer mode with empty water container	Switch heater off and allow to cool. Fill boiler with water
#402	Warm air temperature exceeded: - Not all warm air ducts are connected - Warm air outlets blocked - Circulated air intake blocked	- Check whether the 4 warm air ducts are connected - Check the individual outlet openings - Remove the circulated air intake blockage
#407	No 230 V operating voltage 230 V fuse defective Overheating protection has been triggered	Restore 230 V operating voltage Replace 230 V fuse (see Combi operating instructions) Reset overheating protection (see Combi operating instructions)
#412	Open window above cowl (window switch)	Close window.

Fault Code	Cause	Remedy
#607	Max. number of fault resets reached	Wait 15 minutes and reset fault
#621	Room temperature sensor or cable faulty	Inspect the room temperature sensor cable, replace if faulty Check the resistance of the room temperature sensor. 15 °C – 16.2 kOhm / 20 °C – 12,6 kOhm / 25 °C – 10.0 kOhm Replace room temperature sensor if faulty
#624	Frost Control heating element has a short circuit	Disconnect heating element plug from electronic control unit. Replace heating element

Fault Code	Cause	Remedy
#111	Room temperature sensor or cable faulty	Inspect the room temperature sensor cable, replace if faulty Check the resistance of the room temperature sensor. 15 °C – 16.2 kOhm / 20 °C – 12,6 kOhm / 25 °C – 10.0 kOhm Replace room temperature sensor if faulty
#122	Lack of fuel due to insufficient fuel tank filling, tank has run empty and / or vehicle is on a slope	Fill tank with fuel. Then fill the fuel line as described in “Initial startup” (see Combi Diesel operating instructions).
#132	Frost Control heating element has a short circuit	Disconnect heating element plug from electronic control unit. Replace heating element
#150	Warm air temperature exceeded: - Not all warm air ducts are connected - Warm air outlets blocked - Circulated air intake blocked	- Check whether the 4 warm air ducts are connected - Check the individual outlet openings - Remove the circulated air intake blockage
#151	Water temperature exceeded in winter mode: Water temperature sensor excessive temperature Warm air outlets blocked Circulated air intake blocked	Switch off appliance and allow it to cool down. Fill boiler with water Check the individual outlet openings Remove the circulated air intake blockage
#152	Water temperature exceeded in summer mode: Water temperature sensor excessive temperature Warm air outlets blocked Circulated air intake blocked	Switch off appliance and allow it to cool down. Fill boiler with water Check the individual outlet openings Remove the circulated air intake blockage
#160	Undervoltage < 10.2 V	Check battery voltage, charge if necessary Short-term immediate measure. Switch off major consumers or start up the vehicle engine until the heater starts to operate (approx. 4 minutes) Battery capacity inadequate, if necessary exchange old battery
#161	Overvoltage > 16.4 V	Check battery voltage / voltage sources such as the charger
#162	Open window above cowl (window switch)	Close window.
#164	No 230 V operating voltage 230 V fuse defective Overheating protection has been triggered	Restore 230 V operating voltage Replace 230 V fuse (see Combi operating instructions) Reset overheating protection (see Combi operating instructions)
#255	Heater has no 12 V power supply No connection between heater and control panell	Ensure 12 V power supply Make connection between heater and control panel

Fault Code	Cause	Remedy
#1	Failure (short circuit or broken cable), room temperature sensor	Contact Truma Service
#2	Ice sensor (inside) triggered	Inspect the filter and replace it if necessary
#4	Ice sensor (outside) triggered	Keep the air inlets / outlets on the roof free of obstructions such as leaves
#8	IR receiver unplugged or cable broken	Check the connection of the IR receiver
#17	Voltage drop at 230 V power supply	Check 230 V power supply

Truma Data Sheets

• Truma CP Plus (UK)

  This is currently the most common heating control unit fitted. This can also be controlled via the iNet App

  

• Truma Heating Combi Manual 4 / 6 (UK)

  This is currently the most common heating combi unit fitted. This can also be controlled via the iNet App

  

• Truma Heating Combi Manual E Classic (UK)

  This is currently the most common heating combi unit fitted. This can also be controlled via the iNet App

  

• Truma iNet Manual (UK)

  The iNet system which allows external access to your climate control either by bluetooth or mobile network

  

• Truma CP Classic - 34030_11900 Manual

  Truma CP Classis, this controller unit is no longer used but is still common in older Roller Team mmotorhomes