Vaillant Boiler Fault Codes

When your boiler shows an error code, the first thing to do is jot it down. A simple reset can often fix small problems. But if the issue persists or you're unsure, it's a good idea to contact one of our Gas Safe registered engineers for proper diagnosis and repair.

Most Vaillant boilers are designed with a reset button conveniently located on the front panel. To reset the boiler, simply press and hold the button for a few seconds. If the fault code reappears after resetting, it could point to a more serious underlying issue that requires professional attention. In that case, don’t hesitate to contact a qualified engineer for assistance.

If you see multiple error codes, it could mean there are different issues or a communication problem with the boiler. It's important to take this seriously, as many faults may require a professional evaluation to avoid further damage.

Of course! Certain error codes point to small issues, such as low pressure, while others, like problems with flame detection, can be more serious. If you're unsure or notice any strange smells, sounds, or if there's a lack of heat or hot water, it's a good idea to switch off your boiler and reach out to one of our skilled engineers immediately.

We recommend getting your boiler serviced once a year. Regular maintenance helps you catch problems early, keeps your boiler running smoothly, and protects your manufacturer's warranty. It can also improve energy efficiency, potentially lowering your heating bills and extending the lifespan of your boiler.

If your boiler is still under warranty and has been serviced annually, many repairs may be covered at little or no cost. Be sure to check your warranty documents for details, or contact us at Koziwarm. We’re happy to help you understand what’s included and guide you through the next steps.