The following sections describe the most common Truma heating 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.
Common problem for Truma heater not working
1. No Heat or Hot Water
One of the most common issues with Truma Combi heating systems is a lack of heat or hot water. If you find that your system is not producing any heat or hot water, there are a few troubleshooting steps you can take. First, check if your propane or gas supply is sufficient. Low fuel levels can cause the system to stop working. Additionally, ensure that your thermostat temperature setting. If these factors are not the issue, it’s a good idea to consult your manual for specific error codes related to this problem.
2. Ignition Problems
Ignition problems are another common issue with Truma heating systems when Truma heater is not working. If the system is having trouble igniting, it may result in no heat or hot water. Start by checking that the gas supply is on and that there are no obstructions in the flue or exhaust system. You should also inspect the igniter for any signs of damage or wear. If you’re still experiencing issues, consult your manual for guidance on interpreting the error codes displayed on your digital controller.
3. Inadequate Hot Water Temperature
If you notice that your hot water isn’t reaching the desired temperature, it could be due to various factors. When Truma heater not working, first, check if the water inlet is adequately supplying cold water to the system. The Truma Combi can only produce hot water if it has a sufficient cold water supply. If this is not the problem, examine the temperature settings on your controller. The manual will provide you with information on adjusting the temperature settings to meet your preferences.
4. Noise or Unusual Sounds
Unusual sounds coming from your Truma Combi heating system can be concerning. If you hear clanking, rattling, or other unusual noises, it’s essential to identify the source of the problem. Such sounds could indicate loose components, air in the system, or debris inside the unit. Regular maintenance and cleaning can help prevent these issues. In case the noises persist, refer to your manual for potential error codes that may shed light on the issue.
5. Airlock Issues
Airlocks can prevent the proper circulation of hot water in your Truma Combi system. If you’re getting inconsistent hot water or no hot water at all, there may be an airlock in the system. The
Truma heating problems detected on iNet Box
The Truma iNet Box serves as a sophisticated interface enabling seamless control of your Truma appliances through a user-friendly app. Installing the iNet Box is an hassle-free process. You can add it to any Truma air conditioning systems and Combi heaters equipped with iNet capabilities, even after initial installation.
What’s the significance of LED activity in the Truma iNet Box?
- The blue LED blinks until the Truma iNet Box establishes a connection with the Truma App.
- The green LED blinks until the Truma iNet Box is prepared for operation.
- The red LED blinks until the GSM function is configured.
Truma heating problems detected on the manual control panel
Truma heater problems often manifest through telltale signs on the manual control panel. Common issues when Truma heater not working include an unresponsive control panel, which may indicate a power supply problem or a blown fuse. Irregular temperature control, where the set temperature isn’t maintained, can point to thermostat or sensor malfunctions. Inconsistent burner operation, frequent error codes, or issues with fan speed settings can also be readily identified on the control panel. Monitoring the panel and understanding its display codes can be instrumental in diagnosing and addressing Truma heating system issues, ensuring your comfort and safety while on the road.
LED does not light up after switching on
No power supply
- Check the voltage of the leisure 12V battery.
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 motorhome
- 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 leisure battery is too low (< 10.5V)
- Charge the leisure battery
The green LED light is on and the red LED light comes on when the heater is switched on
Faulty electronics
- Contact your motorhome 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 motorhome to see if anything is blocking it. For example, ice, leaves, etc.
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.
Truma heater turns on, but problem appears after a while
When the Truma heater initially fires up, it seems like all systems are functioning as they should. However, after a short period of operation, an issue emerges and truma heater not working. This sudden hiccup can range from unusual noises and fluctuations in temperature to a complete shutdown. Troubleshooting such problems is essential to ensure the heater’s efficiency and reliability, providing a comfortable and warm environment for its users.
After a while, the heater reports an error
Warm air exhausts are blocked
- Check each of the warm air exhausts in the motorhome.
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.
Common Truma heating problems with Frost Control drain valve
Common Truma heater problems when Truma heater not working often revolve around the Frost Control drain valve. This valve is crucial for preventing freezing in the system, but issues can arise, causing inconvenience and potential damage. One common problem is valve blockage due to debris or sediment accumulation, leading to restricted water flow. Additionally, the valve can become stuck or fail to seal properly, resulting in coolant leakage. Regular maintenance and proper winterization procedures can help mitigate these issues, ensuring that your Truma heating system remains reliable and efficient, especially in cold climates.
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.
manual heating controller will often display error codes or indicators to help diagnose airlock issues. Following the manual’s instructions on how to purge air from the system can resolve this problem.
In conclusion, the Truma Combi heating and hot water system is a reliable choice for many, but like any complex system, it can encounter problems from time to time. Being familiar with your manual and the error codes displayed on your controller can be instrumental in troubleshooting and resolving these issues effectively. If you’ve followed the manual’s guidance and still can’t resolve the problem, don’t hesitate to contact a professional technician for assistance.
We have a 6E system in our Benimar t486 motorhome. The system operates normally on gas and Mix1. It runs for a short period on Mix2 and El1 &2. However, it then trips the main breaker feeding the heater. The system is fitted with an auto frost dump valve.
We conclude that 1 heater element has failed. Does our diagnosis seem correct?
Your diagnosis that one of the heating elements in your Truma 6E system might have failed seems plausible, especially given the symptoms you’re experiencing. The Truma 6E is designed to work on both gas and electricity (with different mix modes), and if it functions normally on gas and Mix1 (which likely uses less electrical power), but trips the main breaker on Mix2 and El1 & El2 modes (which use more electrical power), it does suggest an issue with the electrical components, possibly the heating elements.
Here’s why your diagnosis makes sense:
1. Electrical Overload: If the heating element is failing or has failed, it might be causing an electrical overload when you switch to modes that rely heavily on the electrical heating elements, like Mix2 and El1 & El2. This overload can trip the breaker as a safety measure.
2. Auto Frost Dump Valve: The presence of an auto frost dump valve is unlikely to be the cause of the issue, as this is more related to preventing freezing in cold conditions.
However, it’s important to consider other possibilities as well:
1. Electrical Connection Issues: There could be issues with the electrical connections or wiring, not just the heating elements.
2. Circuit Breaker Sensitivity: Sometimes, the main breaker might be overly sensitive or nearing its end of life, causing it to trip more easily.
3. Power Supply Issues: There could be fluctuations or issues with the external power supply that are more pronounced when the heater demands more power.
To confirm the diagnosis, it would be advisable to:
1. Inspect the Heating Elements: A visual inspection or continuity test of the heating elements can confirm if one is faulty.
2. Check Electrical Connections: Ensure all connections are secure and there are no signs of wear or damage.
3. Consult a Professional: If you’re not experienced with electrical systems, it’s safer and more reliable to have a professional diagnose and repair the issue.
4. Consider System Age and Usage: If your system is quite old or has seen heavy use, other components might also be nearing the end of their lifespan.
It’s great that you’re troubleshooting this yourself, but remember, working with electrical systems can be dangerous, so take all necessary precautions or seek professional help if you’re unsure.
Hi,
I have a 2021 Adria Altea 622dk Avon caravan. Registered for the first time only 11 months ago, so not had hardly any use, everything is like new.
The caravan has a Truma combi heater/ boiler fitted. The heater works OK on electric but plays up on gas. Some days it will ignite and work OK about 6 times when being switch on by the thermostat. Then it will suddenly fail to ignite, it tries to ignite but makes a loud shuddering noise, stops and an E517H error message show on the display, sometimes a E516H error message. If I reset the display and the reset button on the heater I can get it working again after about 4 tries. I have Safefill gas bottles, I have also tried a steel propane cylinder, but I get the same results with either cylinder. The heater is just out of warranty. Have you heard of this issue before order you have any idea what the problem is?
Thanks,
Terry.
Hi Terry.
It sounds like you’re experiencing a tricky issue with your Adria Altea 622dk Avon caravan’s Truma combi heater/boiler. The error codes E517H and E516H on Truma heaters usually indicate problems related to the gas supply or the ignition process.
Here are a few potential causes and solutions:
1. Gas Pressure Issues: Inconsistent gas pressure can lead to ignition problems. It’s worth checking the gas pressure regulator and the gas hoses for any signs of damage or blockage.
2. Ignition System: If there’s an issue with the ignition system, such as dirty or faulty spark electrodes, it could lead to failure in igniting the gas. Cleaning or replacing the spark electrodes might help.
3. Control Unit: Sometimes, the control unit of the heater can malfunction, leading to these error codes. A reset might temporarily solve the issue, but if it’s a recurring problem, the control unit might need to be checked by a professional.
4. Gas Type and Quality: Although you’ve tried different gas cylinders, ensuring the correct type and quality of gas is crucial. Low-quality gas can cause combustion issues.
5. Ventilation and Exhaust: Ensure that the ventilation and exhaust pathways of the heater are clear and unobstructed. Blockages can affect the combustion process.
Since your heater is just out of warranty and considering the complexity of gas appliances, it’s generally safer and more effective to have a certified technician look at it. They can diagnose the issue more accurately and ensure that any repairs are done safely.
Hope this helps, and I wish you a quick resolution to the problem!
Hello,
I have the following drama and would appreciate your help with opinions.
My camper is equipped with a Truma C 3402 under the rear bed. When I turn on the heating from the air ducts under the bed (where the stove is) it starts blowing hot air, but under the table it blows very weak and cool air. There is also a pipe with a hole cut around the upper bedroom, but nothing from there. I noticed that there was also a thin pipe with holes cut under the sink, but nothing from there either. Under one of the seats in the caravan I have a fan that runs separately. When I release it from one air duct under the table, it almost stops blowing and from the other the stream increases, but it is still not hot. I followed the pipe that is for the air ducts under the table, which goes behind the bathroom and next to it is hot but after it slightly warm (I mean the bathroom and the toilet). I noticed that the fan under one of the seats in the camper pulls in warm air from a pipe that runs under the floor on the outside of the camper.
Please advise where the problem could be.
Sorry for the bad English
No worries about your English, it’s quite clear! It sounds like you’re facing a heating distribution issue in your camper, which can be quite common with onboard heating systems like the Truma C 3402. Here are a few thoughts on what might be causing the problem and how you might address it:
1. Blocked or Leaking Ducts: The first thing to check is whether the air ducts are blocked or leaking. Since you mentioned that the air blows hot under the bed (where the heater is) but cools down as it travels, there might be a blockage or a leak in the ducts. Inspect the ducts for any visible damage, especially in the areas where the air seems to be cooler.
2. Uneven Airflow Distribution: These systems often have dampers or adjustable vents that control the flow of air. If these are not adjusted correctly, it can lead to uneven distribution of heat. Check if your system has these features and try adjusting them to see if it improves the airflow.
3. Insufficient Insulation: If the ducts run through areas of the camper that are not well insulated, the heat can be lost before it reaches the vents. This might be particularly relevant for the ducts running under the floor or behind the bathroom. Adding insulation to these areas could help.
4. Faulty Fan or Blower: Since you mentioned a fan under one of the seats, it’s possible that this fan is not working efficiently. If the fan is supposed to assist in circulating warm air and it’s not functioning properly, it could result in weak airflow.
5. System Capacity vs. Camper Size: Sometimes, the heating system might be undersized for the volume of the camper, especially if there have been modifications or additions to the camper.
6. Thermostat Issue: If your heating system is controlled by a thermostat, it’s possible that the thermostat is not functioning correctly, leading to uneven heating.
As a starting point, I’d recommend a thorough inspection of the ductwork for any leaks or blockages, and checking the fan’s operation. If the issue persists, it might be worth consulting a professional who specializes in camper heating systems. They can offer more specific advice and potentially identify issues that are not immediately apparent.
Thank you Martin,
Where can I find those air flow regulators you mentioned in the second point? Is there a way to check the pipes behind the bathroom without having to take it apart?
Thanks in advance!
Finding air flow regulators and inspecting pipes in a camper without dismantling major components can be a bit challenging, but here are some tips:
1. Locating Air Flow Regulators:
• Consult the Manual: The best starting point is to check the user manual for your Truma C 3402 heating system. It should provide details on the location of any dampers or air flow regulators.
• Near the Vents: Often, air flow regulators are located near the vents or along the ducts. Look for sliders, levers, or dials near the vents under the table and other areas.
• Inside the Ducts: In some systems, the regulators are inside the ducts themselves. You might need to remove the vent covers to access them.
2. Inspecting Pipes Behind the Bathroom:
• Access Panels: Some campers have access panels that you can open to inspect the plumbing and heating ducts. Check for any removable panels in or around the bathroom.
• Use an Inspection Camera: A flexible inspection camera, often called an endoscope or a borescope, can be a handy tool. These cameras are mounted on long, flexible cables and can be fed into small spaces, allowing you to see inside the ducts without dismantling anything.
• Feel for Air Leaks: While the heating system is running, you can run your hand along the ducts to feel for any air escaping, which can indicate a leak. Be careful as some areas might be hot.
• Listen for Air Flow: Sometimes, you can hear where the air flow is weaker or if there’s a whistle of escaping air, indicating a leak.
Remember, while some basic checks and maintenance can be done yourself, don’t hesitate to seek professional help if you’re unsure or if the problem persists. Heating systems can be complex, and it’s important to ensure they are working safely and efficiently.
Thanks!
I will check everything and write what happened.
You’re welcome! It sounds like a good plan to thoroughly check everything. If you run into any specific issues or have more questions as you go along, feel free to reach out. Best of luck with your inspection and repairs, and I hope you’re able to resolve the heating issue in your camper soon. Safe and happy travels!
Hi, we have a Truma combi 4D with a classic control panel. Yesterday the unit stopt working with a red light flashing twice every 5 second on the control panel. We turned the power of and on and it started working again. But I can not find in my manual what this error means. Is there a list with flash code errors? (Other than contact your dealer) Before contacting our dealer I like to have an idea what the problem is. (The dealer is 100km away)
kind regards
The discussion thread on MotorhomeFun about the Truma Combi E flashing red light offers some insights that could potentially help with your Truma Combi 4D issue: https://www.motorhomefun.co.uk/forum/threads/truma-combi-e-flashing-red-light.189582/
– Misplaced Fuel Selector Wheel: One user found that the flashing red light was caused by the fuel selector wheel being in the wrong position, looking for 230v instead of the intended power source. This issue was resolved by adjusting the wheel to the correct position.
– Manual Ambiguities: The Truma manual has been criticized for being unclear and using the same symbol for different meanings. A document in the Resources section of the forum, reportedly posted by a user named Minxygirl, might offer more detailed explanations.
– Meaning of Blinking Red Light: It is suggested that a blinking red light indicates a lack of 230v supply. This aligns with the first point about the fuel selector wheel being set incorrectly for the power source.
– Other Possible Causes: Another user experienced a fast flashing red light due to the main switch for the heater being off in the panel where the fuse board is located. Turning this switch on resolved their issue. Additionally, a green light with a flashing red light next to it typically indicates the system is in operation but experiencing a failure, often due to no gas or a faulty gas supply.
Given these insights, it might be worth checking the fuel selector wheel’s position, the main switch for the heater, and the gas supply in your Truma Combi 4D. If these checks don’t resolve the issue, consulting the detailed document mentioned in the forum or contacting a professional for further diagnosis might be necessary.
Hi, thanks for your answer. We are new to traveling in a van and all the technical items inside it. Took me a few months to sort out the electric part of our new Font Vendome Renault Trafic. (We live in France) Replaced already all the Nordelettronica gear to Victron. No more power problems. Last week we got the problem with the Truma. Checking the van outside our house because of the expected frost at night the red light was blinking. A power reset solved it. Today I finnaly got an answer from Truma and they need the fault code on the unit, not on the control panel. We did not know that, it is not in the manual. We have a Truma combi D4 that is using only diesel. And a you write a double red flash can mean anything, form no diesel to low power. The only thing we can do is waiting for it to happen again and get the flash codes from the unit. We have been driving with the Truma heater on. Maybe that has something to do with it.
It sounds like you’re really getting into the details of maintaining and understanding your van’s systems, which is great for long-term travel and self-sufficiency on the road. The transition to Victron equipment for your electrical setup is a solid choice, known for reliability and performance.
Regarding your Truma Combi D4 issue, it’s interesting that Truma requires the fault code from the unit itself rather than the control panel. This distinction isn’t always clear in user manuals. The Combi D4, being a diesel-only model, simplifies potential causes of the error. As you mentioned, issues like low diesel or power irregularities could trigger such a warning.
Since the problem is intermittent and was temporarily resolved with a power reset, it might indeed be related to specific conditions like driving with the heater on. Variations in power supply, fuel levels, or even vibrations and movements while driving could influence how the unit operates.
For future instances, noting the error code directly from the unit when the issue occurs will be crucial for accurate troubleshooting. Meanwhile, it’s a good idea to monitor the diesel level, battery health, and any patterns related to when and how you use the heater. These details could provide valuable clues if the issue reoccurs.
Traveling and living in a van, especially in varying climates like you might experience in France, comes with unique challenges, but it seems like you’re well on your way to mastering them. Safe travels and happy camping!
Hi
I have a Truma D4E combi in my van, its been turned off for 2 weeks (disconnected from power). reconnected today and there is a greenlight that flashes 3 times in the unit and it does nothing. Its getting 13.2v to the unit (normal) and the 2 mini blade fuses directly under the power input connectors are ok. any suggestions would be appreciated.
Hi Tony,
The issue you’re describing with your Truma D4E Combi heater showing a green light that flashes three times suggests a specific fault code. Truma systems use these flashing light codes to indicate various problems or diagnostic issues. Here’s what you can consider:
1. Consult the Manual: The first and most important step is to check the Truma D4E Combi’s manual. These manuals usually contain a list of fault codes indicated by the number and pattern of flashing lights. The three flashes could correspond to a particular issue as defined by the manufacturer.
2. Common Issues to Check:
– Power Supply Issues: Even though you’ve confirmed that it’s getting the correct voltage, it might be worth checking the consistency of the power supply. Sometimes fluctuations or brief interruptions in power can trigger fault codes.
– Control Panel Connection: Ensure that the control panel is properly connected and functioning. A communication issue between the control panel and the heating unit can sometimes cause error codes.
– Gas Supply: If your Truma Combi uses gas (which many models do), check the gas supply. Ensure that the gas cylinders are open, the regulator is working, and there are no obstructions in the gas lines.
– Ventilation Check: Make sure that the vents are clear of any obstructions. Blocked vents can cause heating systems to malfunction.
3. Resetting the System: Sometimes, simply resetting the system can clear a transient fault. You can do this by turning off the power supply to the unit, waiting a few minutes, and then turning it back on.
4. Professional Help: If the problem persists and you’re unable to identify the issue using the manual, it might be best to contact a professional or a Truma service partner. Heating systems can be complex, and issues like these sometimes require specialized knowledge and tools.
Remember, safety is paramount when dealing with gas and electrical systems, so if you’re in any doubt, it’s always better to seek professional assistance.
hi there ,, i have truma blow heater on my 2003 model swift motorhome , problem started when fitted gas tank , we tried to use heater but after big bang heard outside plastic cover broke and since when i turn the heater on amber(yellow) light straight on without flashing and after few sec when fire ups it gives rattle noise (like stone in can) and red lights comes ,, i called few gasman around me and been told it is maybe air leak,, could you please give me some idea which helps who will come to check ,thank you
I’m sorry to hear about the issues you’re experiencing with your Truma blow heater in your Swift motorhome. The symptoms you describe — the “big bang,” the immediate amber light, the rattling noise, and the eventual red light — do indeed suggest a few potential issues that could be at play. Here are some ideas and potential causes to consider, which might help whoever comes to inspect your heater:
1. Gas Pressure Issues: Since the problem started after fitting a gas tank, it’s possible that the issue is related to gas pressure. The “big bang” could have been caused by a gas buildup igniting. Ensure the gas pressure is correctly set for your Truma heater model.
2. Air in the Gas Line: If there was a period when the gas supply was disconnected (such as when installing the tank), air could have entered the gas lines. This air must be purged from the system for the heater to work correctly.
3. Combustion Issues: The rattling noise and the red light might indicate a problem with the combustion process. This could be due to a variety of factors, including obstructed or dirty burner, incorrect gas/air mixture, or issues with the combustion fan.
4. Ventilation and Exhaust: Check that the ventilation and exhaust pathways are clear. Blockages or damage here can cause improper combustion and the symptoms you’re experiencing.
5. Physical Damage: The “big bang” might have caused physical damage to the heater or its components. Check for visible signs of damage to the unit, especially in the combustion chamber area.
6. Electronic Control Failure: Sometimes, the control electronics can malfunction, especially after a sudden incident like what you described. This might require diagnostic tools that a professional would have.
When the gas technician comes to inspect your heater, it would be helpful to:
– Explain the full sequence of events, including the installation of the gas tank and the exact symptoms.
– Show them the broken plastic cover and explain the “big bang” incident in detail.
– Ensure they check the gas line for leaks, proper pressure, and the purging of air.
– Ask them to inspect the combustion chamber and exhaust systems for any blockages or damage.
Safety is paramount when dealing with gas appliances, so it’s good that you’re seeking professional help. Hopefully, these pointers will assist in diagnosing and resolving the issue with your heater.
Hello, i’m hoping somebody can advise me please!
I have a mercedes sprinter with a Truma heating system. The error message “E517H” keeps coming up on the system while the van is out on a rental. There is definitely a gas supply as the hob is working fine but this message keeps popping up whenever the lady tries to put the heating or hot water on. Usually i manage to fix this easily but don’t seem to have any luck this time. Can anybody advise on a fix or even a quick fix until i can get the van checked over after her trip.
Also where will i find somebody professional to take a look for me please?
Many thanks in advance
Leila
Hey Leila! Dealing with error codes on your Truma heating system can be a bit of a hassle, especially when you’re on the road. It’s great that you’re reaching out for help!
The “E517H” error message typically indicates a problem with the gas supply to the Truma system. Since the hob is working fine, it sounds like there might be a specific issue with the gas supply to the heating and hot water functions.
One thing you could try as a quick fix is to reset the system. Sometimes, simply turning the system off, waiting a minute or two, and then turning it back on can clear up minor glitches. If that doesn’t work, double-check all the gas connections to ensure there are no leaks or blockages.
If the issue persists and you’re unable to resolve it on your own, it’s best to seek professional assistance. You can look for certified Truma service centers or RV repair shops in your area. They’ll have the expertise and equipment to diagnose and fix the problem properly.
In the meantime, if the weather allows, you might want to consider alternative heating methods or staying at campsites with facilities until you can get the van checked over after the trip.
Hope this helps, and safe travels!