Roca NR 15/20 Boiler Error 06

What does this failure that affects the Roca NR-15/20 boiler mean?

Oh no! Is your Roca boiler showing the frustrating error code 06 and the heating has turned off? Don't worry! This annoying fault has a solution, and today we are going to guide you step by step to fix it. But first, we will explain what this failure means for your boiler and also what its possible causes and solutions are.

The error code 06 fault in a Roca NR-15/20 boiler indicates that the over-temperature klixon has been activated. The over-temperature klixon is a safety device found in all Roca boilers that functions to protect the equipment from possible damage due to excessive temperature. If the water temperature inside the boiler exceeds a certain limit, the klixon activates and cuts off the electrical current, turning off the boiler and displaying the error on the screen.

These are the possible causes for the klixon activating due to over-temperature:

• Problems with water circulation: If the water does not circulate correctly inside the boiler, it can cause a temperature increase that activates the over-temperature klixon. This can be due to a faulty water pump, a problem with the pipes, or the presence of air in the circulation system that needs to be purged.
• Faulty temperature sensor: The temperature sensor is responsible for measuring the water temperature inside the boiler. If the temperature sensor is defective, it can send incorrect information to the boiler, which can activate the over-temperature klixon.
• Burner problems: If the burner does not function correctly, it can produce a flame that is too large or unstable, which can inadvertently increase the water temperature and activate the over-temperature klixon.
• Dirt accumulation in the boiler: Over time, dirt can accumulate inside the boiler, which can reduce the efficiency of heat exchange and cause an increase in internal temperature, triggering the klixon and displaying the error on the screen.

These were the causes that most likely caused the fault in your Roca boiler. But now let's see what kind of solutions we can apply to resolve this problem.

How can the 06 fault in the Roca NR-15/20 boiler be fixed?

We have prepared a list of solutions for you that will surely fix the error code 03 fault in your Roca boiler. You just need to make sure to follow everything to the letter and not overlook anything:

1. Restart and let the boiler rest may be the solution to this problem: Restarting the boiler can be the solution to the problem, as it allows it to rest and at the same time reset its sensors. To do this procedure, you just need to turn off your boiler completely and disconnect it from the electricity for about 15 minutes to ensure the temperature also decreases. Once the time has passed, reconnect it and turn it on to check that everything is working well and that the error has completely disappeared. If the problem persists, then we will have to work on fixing it.
2. Check the water pressure of your Roca boiler and make sure the water flow is fluid and constant: The water pressure in the heating system must be within the values recommended by the manufacturer. If the pressure is too low, it can cause problems with water circulation and activate the over-temperature klixon. Make sure that the water supply to your boiler is in good condition and that the water flow is constant and fluid, without cuts or interruptions.
3. Bleed the radiators of your Roca boiler, as there may be air bubbles inside the circuit: The presence of air in the radiators can prevent proper water circulation, so we will need to bleed the entire circuit. To bleed the radiators, open the bleed valve of each radiator and let the air out until water comes out. If you have doubts about how to do this procedure correctly, you can consult the manufacturer's manual to follow all the steps indicated for a proper air purge.
4. Clean your Roca boiler and perform preventive maintenance: You should clean the boiler periodically to remove dirt and debris that may accumulate inside. Check the user manual of your boiler to know how to clean it correctly. Also, make sure the flue is clear and unobstructed, as a blocked flue can cause temperature buildup inside the boiler, triggering the over-temperature klixon and displaying the error on the screen.
5. Check the burner of your Roca boiler and ensure the flame is stable: Since you have done maintenance on your boiler, also take the opportunity to check the burner. Ensure it is clean, that the spark is made correctly, and that the flame is as stable as possible according to the manufacturer's instructions. The flame should be adequate to heat the water, no more, no less, because if the flame is too large for the small amount of water that needs to be heated, the temperature will rise and can trigger the over-temperature klixon.
6. If the problem persists, please review all the previously mentioned steps: If you have tried all the above solutions and the problem persists, it is likely that the issue is with an internal component of the boiler or that you need to replace the over-temperature klixon. In this case, we recommend you call Roca technical support so that a qualified technician can check the boiler and make the necessary repairs.
7. Check and replace the over-temperature klixon of your Roca boiler: If you are willing to check this component yourself, you can use a multimeter to check if it has continuity. Remember that this klixon trips with heat, so you can check the continuity and if it tests positive, it could be said to be fine. However, we recommend applying a bit of heat to check if it actually activates and breaks the continuity. You can use a lighter to help with this task and try to activate it. The klixon will return to its normal state once the heat has dissipated. If you notice that the klixon does not work correctly, then you will need to replace it with a new one that is compatible with your Roca boiler model.
8. Call Roca technical support for a complete and thorough review of your boiler: If you are not comfortable making repairs on your own, or if the problem persists after trying all the above solutions, we recommend calling Roca technical support. They can help you diagnose the problem and offer the best repair options with all available guarantees.

To conclude, the error code 06 fault in a Roca NR-15/20 boiler indicates that the over-temperature klixon has been activated. The possible causes include problems with water circulation, a faulty temperature sensor, burner issues, or dirt accumulation in the boiler. Generally, this type of problem occurs when the boiler has not been turned on for a considerable time and needs a little maintenance or a brief adjustment to be reused.

This fault does not mean that your boiler is damaged or that you need to replace it, far from it; it is just a warning to indicate that it probably needs some care from you. Remember that good preventive maintenance can help solve these types of situations. Thank you very much and good luck!