Sime Boiler Error 12

What does this fault affecting the Sime boiler mean?

Is your Sime boiler causing you trouble and displaying the dreaded error 12 on the screen? Don't worry, you're not alone. This fault is often related to incorrect combustion settings in the boiler, which can lead to operational failures and affect its performance. In this article, we'll guide you through the possible causes and solutions for this issue with your Sime boiler, so you can get back to enjoying hot water and heating in your home.

This error code 12 fault in Sime boilers can be caused by various factors, such as incorrect air-to-gas mixture settings, burner malfunction, or even issues with the flue. If you encounter this error on your boiler, it's important to take it seriously and take steps to resolve it as soon as possible.

Here are the possible causes of this fault in your Sime boiler:

• Incorrect combustion settings: The air-to-gas mixture feeding the boiler burner must be properly adjusted to ensure efficient combustion. If this mixture is too high or too low, it can cause this fault.
• Burner malfunction: The burner ignites the air-to-gas mixture in the boiler. If the burner is dirty, obstructed, or damaged, it can trigger the error in your boiler.
• Flue problems: The boiler flue must be free from obstructions so that combustion gases can escape properly. A blocked flue can lead to this fault.
• Defective sensors: In some cases, the error may be due to a problem with the boiler sensors that monitor combustion. If the sensors are very dirty or faulty, they can send false positives to the boiler control panel.

Now that you know the causes of this fault in Sime boilers, we can try a few solutions to fix it ourselves.

How can I fix error code 12 on the Sime boiler?

So that you can find an appropriate solution to this problem and be able to continue using your boiler normally, you can follow the steps we indicate below:

1. Restart the Sime boiler to rule out sensor issues: Sometimes, a simple restart of the boiler can resolve the problem by resetting the sensors. To do this, turn off the boiler and disconnect it from the power supply for a few minutes. Let the boiler rest, then reconnect and turn it back on to see if the error has cleared. If the issue persists, don't worry; we have more solutions for you to try and fix this fault.
2. Check the combustion settings on your Sime boiler: If restarting doesn't work, you need to check the combustion settings of the boiler. Refer to the manufacturer's manual and ensure you have the correct settings for proper boiler operation. Follow each step as instructed in the manual and perform necessary adjustments. Adjusting the air intake or gas supply valve might help resolve the issue. If the problem persists after correct adjustment, then a full boiler maintenance may be required.
3. Clean the burner of your Sime boiler: A dirty burner can cause such faults in your boiler. To clean the burner, turn off and disconnect the boiler from the power supply for safety. Then, dismantle the burner and clean it with a soft brush and a degreasing product. Dry it thoroughly and reassemble to check if the error has disappeared.
4. Inspect the flue exhaust of your Sime boiler: Ensure that the flue exhaust is free from obstructions. When not in use, the flue can accumulate cobwebs, or even birds or rodents may nest in this pipe. Consult the Sime manufacturer's manual to verify proper installation of the pipe, as it is common that the pipe is left too long than normal during installation. Clean the entire pipe from the inlet to the outlet and ensure it is clean and properly installed. Also, check for any blockages.
5. Check the sensors of your Sime boiler: If you've tried all the above solutions and the fault persists, the issue may lie with the boiler sensors. In this case, clean them with an electronic cleaner and remove any dirt or sulphate from their connections. Remember that moisture is the enemy of electronic components, so there may be some sulphated part or that the sensor is just too dirty. Once you've done the checks and the problem continues, you may need to replace the faulty sensor with a new one compatible with your Sime boiler.
6. If the problem persists, please review all the steps mentioned above: It's important to review all the steps and solutions described before contacting Sime's technical support. Make sure you've performed all checks and repairs within your capability before seeking professional help and potentially spending money that may not be necessary. We're saving you money because we care about your budget! So please perform a second check of everything we've indicated, and if the problem persists, it may be best to leave it to the experts.
7. Contact Sime technical support for a thorough review of your boiler: If you've tried all the solutions and the fault persists, it's time to call in the experts to help solve this problem. They can send a qualified technician to your home for a comprehensive inspection of your boiler and to definitively resolve the issue. Remember that Sime knows their boiler inside out and has the tools, spare parts, and knowledge necessary to fix this fault.

To summarize, the error code 12 fault in Sime boilers is often related to incorrect combustion settings. The causes can vary, such as incorrect combustion settings, burner malfunction, sensor failure, and/or a blocked or very dirty flue. If you want to fix this problem and continue using your Sime boiler normally, just follow the steps we've outlined in this guide.

That's pretty much it! Honestly, this fault isn't very complicated to fix. In fact, you probably won't even need to uncover the boiler to solve this problem. Remember that good preventive maintenance can help you avoid such situations. Good luck!