Truma heating problems

Truma heating problems

The following sections describe the most common problems with Truma Combi heating and hot water boilers. This section of the manual is applicable to the Trumatic manual heating controller. The digital controller will display an error, which you can check directly in the manual for your version of the digital controller.

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LED does not light up after switching on

No power supply

  • Check the voltage of the residential 12V flashlight.

Faulty fuse

  • Check the fuse for the device. If it is faulty replace it with a new one of the same value.

When switched on, the green LED light comes on but the heater does not run

The temperature on the control panel is set lower than the actual temperature inside the caravan

  • Set the desired temperature on the control panel to a higher temperature.

The green LED light is on and the red LED light flashes when the heating is switched on

The window above the heater exhaust is open, the window switch is activated

  • Close the window.

The voltage at the residential flashlight is too low (< 10.5V)

  • Charge the residential torch.

The green LED light is on and the red LED light comes on when the heater is switched on

Faulty electronics

  • Contact your caravan service or Truma service centre.

The red LED light comes on approximately 30 seconds after the heater is switched on

Gas cylinder is empty or gas cap is closed

  • Check the gas supply and open the gas supply valves.

Air supply or heating exhaust blocked

  • Check the heating exhaust on the outside of the caravan to see if anything is blocking it. For example, ice, leaves, etc.

After a while, the heater reports an error

Warm air exhausts are blocked

  • Check each of the warm air exhausts in the caravan.

Air circulation blocked

  • Check the air circulation hoses.

Frozen gas pressure regulator

  • Turn on the EisEx regulator heater.

Too much butane in gas cylinder

  • Use propane. Butane is not suitable for heating at temperatures below 10 degrees Celsius.

Green and red LED light flashes when heating is switched off

The heating has switched off due to an error. A heating time-out is activated due to a reduction in heating temperature

  • The time-out is switched off after a few minutes. Only then is it possible to reset the device, switch it off and on again.

The green LED light flashes after the heating has been switched off

A heating time-out is activated due to a reduction in heating temperature

  • This is not an error. The time-out automatically switches off after approx. 5 minutes. The heating can be switched on again at any time during the heating time-out in winter mode and after two minutes in summer mode.

The FrostControl drain valve has opened after the heating has been switched off

The temperature at the drain valve is below 3 degrees Celsius

  • Switch on the heating again. The drain valve opens automatically if the ambient temperature drops below 3 degrees Celsius. You can only manually close the drain valve again if the ambient temperature is above 7 degrees Celsius.

The FrostControl drain valve cannot be closed

The temperature around the drain valve is below 7 degrees Celsius

  • Switch on the heating again. You can only manually close the drain valve again if the temperature around it is above 7 degrees Celsius.

The rotary knob is not in the “Operating” position

  • Turn the drain valve rotary knob to the “Operating” position while pushing the blue activation button on the side of the Frost Control.

Water will spray out of the FrostControl drain valve

  • Water pressure too high
  • Check the pump pressure, the maximum should be 2.8 bar. If you are connecting to an external water connection, you must use a water pressure regulator to reduce the pressure below 2.8 bar.

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