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s30 fault on vaillant boiler

Oh no, s30 fault on your Vaillant boiler? Don't worry, we've got you covered with some quick and easy solutions to get your heat back on!


Are you experiencing the dreaded S30 fault on your Vaillant boiler? Don’t worry, we’ve got you covered! In this article, we’ll walk you through some troubleshooting tips to help you say goodbye to this pesky issue once and for all. With a little bit of know-how and a positive attitude, you’ll have your boiler up and running smoothly in no time.

Troubleshooting the S30 Fault on Your Vaillant Boiler

The S30 fault on your Vaillant boiler typically indicates a problem with the flue gas system. One of the first things you can do is to check for any blockages or obstructions in the flue pipe. Make sure that the flue is clear of any debris or foreign objects that could be causing the issue. If you find any blockages, carefully remove them and see if that resolves the S30 fault.

Another common cause of the S30 fault is a faulty flue gas sensor. This sensor is responsible for measuring the levels of harmful gases in the flue and ensuring that they are safely vented out of your home. If the sensor is faulty, it may be sending incorrect readings to the boiler, triggering the S30 fault. In this case, you may need to have the sensor replaced by a professional technician to solve the issue.

Say Goodbye to the S30 Fault with These Helpful Tips

If you’ve checked for blockages and replaced the flue gas sensor but are still experiencing the S30 fault, it may be time to reset your Vaillant boiler. To do this, simply locate the reset button on your boiler and hold it down for a few seconds until the display resets. This can often clear any temporary faults and get your boiler back up and running smoothly.

In some cases, the S30 fault may be due to a more serious issue with your boiler’s ventilation system. If you’ve exhausted all other troubleshooting steps and are still seeing the fault, it’s best to contact a qualified heating engineer for further assistance. They will be able to diagnose the problem accurately and provide you with the necessary repairs to ensure that your Vaillant boiler is working safely and efficiently once again.


With these helpful tips and a little bit of perseverance, you can bid farewell to the S30 fault on your Vaillant boiler. Remember, safety always comes first when dealing with boiler issues, so don’t hesitate to seek professional help if needed. Before you know it, your home will be warm and cozy once again thanks to your newly fixed boiler. Keep calm and troubleshoot on!

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