Truma DuoControl
Truma DuoControl is a safety gas pressure control system with automatic switching for connecting two gas cylinders in caravans and motorhomes. It ensures a constant outlet pressure of 30 mbar at an allowed inlet pressure of 0.6 – 16 bar.
Technical Specifications
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|
Operational Fault | The pressure in the currently used cylinder has dropped below 0.5 bar, and the system has automatically switched to the reserve cylinder. | Check the connection to the empty cylinder, verify its fill level, and replace the empty cylinder with a full one. | DIY Safe |
Gas system leaking | A leak has been detected during the high-pressure or low-pressure leak test. | Immediately close the gas cylinder valve and have the gas system repaired by an authorized specialist; do not reopen the valve in the meantime. | Professional Intervention Required |
Operational Fault | Possible cylinder empty, closed valve, triggered reset button, or regulator icing at low temperatures around 0 °C. | Check the fill level of the gas cylinder, ensure cylinder valve is opened, check hose rupture protection, verify switchover system is set correctly, check whether the reset button has triggered, check quick-acting shut-off valves, or install Truma EisEx regulator heater if freezing occurs. | DIY Safe |
Operational Fault | Gas extraction is taking place from the right-hand cylinder (reserve cylinder), indicating the operating cylinder is empty or pressure has dropped below 0.4 bar. | Check the connection to the left cylinder and the gas fill level, and replace or switch cylinders as needed. | DIY Safe |
Operational Fault | Possible gas leak in the system. | Do not switch on electrical appliances or ignition sources. Close cylinder valves immediately, have the system repaired by a specialist, and do not open valves in the meantime. | Professional Intervention Required |
Operational Fault | The crash sensor or relief system has tripped or needs to be manually reset. | Firmly press and slightly turn the reset button to the left to return it to the 'ready for operation' position. | DIY Safe |
Frequently Asked Questions
Q: Can I replace an empty gas cylinder without interrupting the operation of appliances?
Yes, DuoControl allows you to replace an empty gas cylinder with a new one while appliances continue to run. Integrated check valves prevent gas escaping if only a single cylinder is temporarily connected.
Q: When should pressure regulators and hoses be replaced?
Pressure regulators and hose assemblies must be replaced with new ones no later than 10 years after their date of manufacture (or after 8 years for commercial use).
Q: Can the heating be operated while driving?
Yes, with a safety shut-off device like the Truma DuoControl CS and a properly sized gas installation, using liquefied gas heating while driving is permitted across Europe under Regulation (EC) No. 661/2009 and UN/ECE Regulation R 122.
Q: How do I reset the reset button?
Press the black reset button with the T20 Torx pin of the screw aid into the housing and gently turn in an anti-clockwise direction, ensuring it remains engaged.
Q: Can gas appliances be operated while driving with the DuoControl?
No, the DuoControl does not have an integrated safety shut-off device (crash sensor) according to UN-ECE regulation 122, so gas appliances may not be operated in the vehicle while driving.