frequently asked questions

Frequently Asked Questions

Truma AquaGo

  • How Does the Truma AquaGo Work?

    acquago circulationThe Truma AquaGo instant water heater is connected between the vehicle's fresh water supply and its hot water system. When the appliance is switched on, the burner starts automatically as soon as the hot water faucet is opened and the flow of the water is greater than approximately 0.4 gallons per minute (1.5 l/min). The stepless burner control adjusts heater output based on flow and inlet water temperature, maintaining an outlet temperature of approximately 120 °F (49 °C).

    A temperature stabilizer minimizes outlet temperature fluctuations. A comfortable water temperature at the faucet or shower is achieved by mixing with cold water. The burner switches off automatically when the faucet is closed to conserve LP gas. The Truma AquaGo basic does not have frost protection and should not be used or filled with water when there is a danger of freezing.

  • My AquaGo has a rapidly flashing light at LED3

    Truma AquaGo stuck in clean mode
    Please follow these instructions step by step (download a printable version here)


    1. Power to the unit must be on from the main panel
    2. The outside switch on the AquaGo needs to be in the “ON” position either up or down.
    3. Turn rotary dial on inside switch to “ECO” or “Comfort” mode (these are the top 2 positions on the switch)
    4. Wait until you hear the circulation pump cycle on and off – You may need to “wake up” the switch by turning it on and off a couple times until you hear the circulation pump cycling.
    5. Open all the hot water faucets in the vehicle- let the water run until the yellow light stops flashing, this could take 15 minutes or more. (During this time you will hear the circulation pump turning off and on in approx. 30 second intervals this is normal. The burner will not ignite)
    6. Once the flush cycle is complete the LED on the control switch goes out and you will see a red LED fault code on the main control PCB. This is fault code 31 (S,S,S,L,L,L,L,L) “Decalcification Complete”.
    7. Turn rotary dial to the “off” position
    8. Turn the rocker switch on the AquaGo to the “off” position wait 30 seconds
    9. Turn rocker switch on the AquaGo back on- solid green light should be present
    10. Turn the rotary dial to the “ECO” or “Comfort” mode (you may need to wake up the dial by turning it on and off a couple times)

    The unit should work normally at this time.

Truma Combi

  • How Does the Truma Combi Work?

    1 Control panel
    2 Gas connection
    3 Solenoid valve
    4 Combined combustion air/exhaust cowl
    5 Combustion air fan
    6 Gas burner
    7 Ignition electrode
    8 Combustion chamber
    9 Flame tube with baffle
    10 Combustion air fan
    11 Heat exchanger
    12 Electric heating elements
    13 Four warm air outlets
    14 Stainless steel water container,10 litres
    15 Hot water connection pipe
    16 Cold water connection pipe
    17 Room temperature sensor
    18 HDF thermal jacket

    The furnace is switched on and the required temperature for heating and warm water is set on the Truma Combi LCD control panel (1). The gas supply to the furnace is controlled by the solenoid valve (3). The necessary combustion air flows through the outer pipe of the combined inlet for combustion air/outlet for exhaust (4) into the furnace and is transported into the gas burner (6) with the help of the combustion air motor (5). The gas burner ignites the gas-air mixture 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 burner's flame tube and the inner wall of the heat exchanger. They leave the furnace through the exhaust outlet (4).

    The circulation air fan (10) feeds the air to be heated into the device. The air flows along the heat exchanger (11) ribs, which ensure optimum heat transfer with their large transfer surface. Additional electric heating elements (12) are situated in the heat exchanger. Water and/or air can be alternatively or additionally heated by them. The warm air is then distributed in the vehicle via four warm air outlets (13). The fresh water is located in the outer stainless steel water container (14). It is heated by heat transfer from the heat exchanger (11).

Truma VarioHeat

Truma LevelCheck

  • How Does the Truma LevelCheck Work?

    To measure, place the Truma LevelCheck against the wall of the LPG tank horizontally at a 90° angle. The fill level is determined using an ultrasound signal. If there is LPG at the measured area, the signal is echoed by the opposite wall of the tank. This measurement is indicated by a green LED and a high-pitched "beep". If there is no LP at the measured area, the signal is not echoed back. This is indicated by a red LED and a lower-pitched "beep".


    Attach Truma LevelCheck horizontally to the wall of the gas cylinder at an angle of 90°. If there is liquefied gas in the measuring range, the result is shown by a green LED. Otherwise, the LED is red.


    In order to obtain a reliable measurement, the measuring head must be cleaned regularly with a wet cloth (do not use any cleaning agents). A soiled measuring head can result in inaccurate measurements.
    Dust particles often stick to tanks, particularly aluminium ones, which interfere with the measuring procedure.

    Soiled or rusty LPG tanks also tend to be difficult to measure.
    Measurements can be affected by the following:

    • invisible rusty areas in the inside of the LPG tank
    • an extremely thick coating of paint on the exterior of the LPG tank
    • stickers on the outside of the LPG tank
    • frozen condensation on the outside of the LPG tank
    • dented or heavily scratched LPG tanks

    Cleaning or measuring in a different location on the tank usually produces the desired result.

    It is not possible to take measurements on plastic cylinders (because the signal is not echoed), gas tanks or fillable gas cylinders (because of internal components that deflect the signal).

    How do I know whether I have a reliable measurement?

    • You should get a result in approximately 1-2 seconds.
    • With a short measuring time, the device has a clear signal and the indicator (green) for the filled area or (red) for the empty area is reliable.
    • A longer measuring time between 3 and 10 seconds is an indication of an unclear signal, which will result in a red indicator (erroneous measurement).

    Additional note:
    Measurements taken in the lower area of full gas cylinders often fail. This is because of the restricted reflection of the echo from the distant surface of the liquid gas.

CP Plus Control Panel

Truma App

General Questions

  • Do Truma Propane Heaters Require Maintenance?


    However, with heaters that are supported by fans, we recommend that you clean the heat exchanger and the fan wheel fins with a paintbrush or vacuum cleaner before winter.

    If the heater has an auto ignitor, we recommend that you replace the batteries about every two years or if the ignition frequency becomes slower. Use only batteries that are heat proof and that do not leak.

  • Is the Truma iNet System Available for the North American RV Market?

    Thank you for your interest in the Truma iNet system.

    Currently this product is not available to the North American RV market. 
    We are working hard to develop an integrated digital solution to support connected systems in the future and will provide additional information once available. 
    For general inquiries about Truma and where to purchase our systems, please email or call toll free 1-855-558-7862.