Hermann Boiler Error F28

What could this error code affecting your Hermann boiler mean?

If you have a Hermann boiler, then this article is for you. We all know that boilers are devices that provide comfort in the home, especially in winter when we need hot water for more comfort in our home.

When a Hermann boiler displays the F28 error code, it indicates a problem with ignition or lack of flame. This error is a sign that the boiler attempted to ignite but could not do so, which can be due to several reasons related to gas supply or some faulty components.

Understanding the causes and solutions of this error is crucial to maintain the efficient and safe operation of the boiler. So let's see what these causes could be:

• Gas supply failure: If there is no gas reaching the boiler, it will not be able to ignite, so you will have to check the supply and confirm if it really reaches your boiler.
• Air in the gas circuit: There may be air trapped in the gas circuit preventing flow, so you will have to bleed the system.
• Low gas pressure: Insufficient pressure will not allow proper ignition at the electrodes, so you need to ensure that the pressure is suitable for your boiler model.
• Injector problems: Injectors may be clogged or damaged, so you will need to check and perform preventive maintenance or replace them.
• Damaged or misaligned electrodes: These components are essential for ignition, and if they are in poor condition or misaligned, the boiler will not ignite.
• Poor connections in internal wiring: Faulty wiring can prevent the transmission of necessary electrical signals for your boiler's operation.
• Faulty PCB electronic board: Although rare, this board can also be damaged. This would be the last component you should check because if the board is damaged, the boiler will not be able to operate correctly.

These are all the causes that can cause this problem to appear on your boiler's screen. As you may have noticed, there are several causes that can trigger it, but we advise you to first check the gas supply issue.

How will you be able to solve the F28 error code from your Hermann boiler?

We are going to leave you here a list of possible solutions that you can apply to fix this problem that you have in the Hermann boiler. We have organized them from the easiest and simplest to the most complicated, so take your time and review each step in detail:

1. Turn off and disconnect the boiler to reset its sensors may solve the problem: A super easy and simple procedure that you should try first. This step involves turning off your boiler completely and unplugging it from the power outlet for a few minutes. Wait for about 15 minutes and reconnect your boiler to check if the procedure has worked. Turn on your boiler and please check if the error has disappeared. If you were not successful, then proceed with the following steps below.
2. Check the gas supply to your home and boiler: We know that the problem with your boiler is due to a gas supply failure, so you need to check that you actually have the service active. To ensure this, activate other appliances that depend on gas for their operation, such as a stove or grill. Consult with the company that supplies you with the gas service and confirm that you have the service activated. If the boiler does not receive any gas, it simply will not work, as gas is the fuel for your boiler.
3. Check and adjust the gas pressure reaching your boiler: The gas pressure reaching your boiler may not be adequate, and you may need to adjust the shut-off valve. Open it completely, and if it was already fully open, you can use a pressure gauge to check the pressure in bars. Consult the manufacturer's manual to find out how much pressure your boiler needs for its operation and compare it with the result shown by the pressure gauge. Make the necessary adjustments and check again if your boiler is still showing the same error.
4. Purge the entire gas circuit of your Hermann boiler: Purge the system to remove any pockets of air that may be inside the pipes. Some boiler models have a function to purge the air, so you will need to consult the manufacturer's manual to see if you can perform this procedure automatically with a button on the boiler. Otherwise, you will have to manually purge the entire circuit. To perform this procedure, it is important that the boiler is completely turned off and cool to avoid burn risks. Find the bleed valve near the burner or electrodes. Open the valve and let all the air out, and once the process is complete, close it again and turn on the boiler to check if the error has disappeared.
5. Clean or replace the injectors of your Hermann boiler: Locate the injectors of your boiler and carefully remove them using a wrench. Be sure to have completely turned off the boiler before performing this procedure and, if possible, also disconnect it from the power outlet to avoid accidents. Soak the injectors in soapy water and a little vinegar to remove impurities, clean them well with a bristle brush, especially in the holes. Once clean, reinstall them in the boiler and check their operation. Tighten the injectors well to prevent possible gas leaks in your boiler. If you notice that the injectors are very clogged, then you will need to find a replacement for new ones compatible with your boiler model.
6. Inspect, align, and/or repair the electrodes of your boiler: It is common for electrodes to become dirty with soot or dirt and not ignite the gas properly to generate the necessary spark and flame. Make sure the boiler electrodes are in good condition and aligned with each other, as if they are too far from the burner, the spark will not ignite. If you notice they are very dirty, carefully remove them from the boiler and perform a brief maintenance to remove any dust, dirt, cobwebs, and soot that may have accumulated. Once the cleaning is complete, reconnect these electrodes and check again if the error of your boiler has disappeared.
7. Check the internal wiring and connections of your Hermann boiler: Look for and repair any loose or damaged connections inside your boiler. Generally, the wiring is protected so that high temperatures do not affect it too much; however, it may happen that this protection fails due to the period of use and even more so if the boiler has not been properly maintained and always operates at very high temperatures. Look for cables that may have been cut, loosened, burned, or scorched and replace them if necessary. If you notice cables with bites, don't be alarmed, it's normal, as rodents may have entered your boiler to nest and protect themselves from the cold, and there you have the consequences. Also, take the opportunity to check the connections and ends of these cables. Once you have verified that everything is in optimal condition, you can reconnect everything and turn on your boiler to check its operation.
8. Verify that the PCB electronic board of your boiler is functioning correctly: If you have knowledge in electronics, then it's time to put them to the test. If you have tried everything and nothing has solved the problem, then most likely the PCB electronic board of your boiler has been damaged and you will have to replace it. If you know a lot about electronics and have the right tools for soldering work and have a multimeter, you can check all the components of the electronic board and locate the one that may be failing to find a replacement and save money.
9. Repeat all the steps mentioned above: If the problem persists, go over everything mentioned above and follow the steps to the letter. You may have skipped one of the steps without realizing it or not followed the instructions we have given you properly. Sometimes, a brief review can be an effective solution to this problem. If the problem still persists, then it's best to leave it in the hands of the experts.
10. Call Hermann's technical support and request a home visit: Haven't been able to solve the problem yourself? No problem, you can always rely on Hermann's technical support to address this situation and provide you with an appropriate solution as needed. Hermann has certified technicians, the necessary tools, and the appropriate and original spare parts to address your problem in the best possible way. Give them a phone call and arrange a home visit for them to check your boiler and make any necessary repairs. Once the repair work is completed, they will give you a warranty for all the work done.

To summarize, we have already explained to you throughout this article that the error code F28 on Hermann boilers suggests problems with ignition. Causes can range from gas supply failures to damaged components or even a failed PCB electronic card. Solutions range from a simple reset to detailed component inspection and, if necessary, the intervention of a specialized technician. It is important that you follow the steps carefully and seek professional assistance if you cannot solve the problem yourself.