🕑 5 minutes read
Worcester Bosch boilers have established a strong reputation for their exceptional reliability and efficiency, but like any complex system, they can encounter errors. One such error is the FA 306 code, indicating a flame signal without the presence of an actual flame.

In this blog post, we will explore the possible reasons behind the FA 306 error code and discuss the steps you can take to resolve it.

Understanding the FA 306 Error Code: False Flame Fault
The FA 306 error code typically occurs when the boiler's flame signal is detected, even when no flame is present.

This can be attributed to a malfunctioning air-to-gas ratio control valve or a faulty ionisation cable. It is important to address this error promptly once it has been diagnosed.

Troubleshooting the FA 306 Error Code

Reset the Boiler
When faced with the FA 306 error code on the Worcester boiler, performing a boiler reset is the best course of action. Taking this straightforward step can frequently resolve the problem by allowing the system to restart and restore proper functionality. To do this, find the reset button on the control panel and hold it down for a few seconds. While this may seem like a quick fix, it is important to note that if the error code persists after the reset, it will require further investigation. While troubleshooting boiler issues may seem daunting, taking it one step at a time can often lead to a swift resolution.

For safety reasons, resetting your boiler is only advised if you are familiar with the boiler controls. If boilers aren't your thing, then seek the assistance of a qualified gas engineer to perform the reset.

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Air-to-Gas Ratio Control Valve
One potential cause of the FA 306 error code is a malfunctioning air-to-gas ratio control valve. This vital component is responsible for regulating the precise flow of air and gas in the combustion process. When the valve fails to function properly, it can adversely affect the flame detection system. This requires a boiler engineer who will thoroughly inspect the control valve and, if necessary, recommend its replacement. Their expertise will ensure the control valve operates correctly to restore functionality.

Inspect the Ionisation Cable
An additional factor that could cause the FA 306 error code is a compromised or defective ionisation cable. This crucial component is responsible for detecting the presence of a flame by monitoring the ionisation current. Should the cable be frayed, loose, or damaged in any way, it may fail to accurately detect the flame, resulting in the occurrence of the error code. Again, this can be resolved by engaging a Gas Safe engineer to replace the cable.

However, encountering the FA 306 error code can be a frustrating experience, but with proper troubleshooting, it can be resolved. Resetting the boiler is the first step, followed by checking the air-to-gas ratio control valve and inspecting the ionisation cable.

Professional Assistance

If you're experiencing persistent FA 306 error codes despite attempting the recommended steps, you should seek the assistance of a qualified professional. Hiring a heating engineer or Worcester Bosch boiler specialist can identify the root cause of the error and perform the necessary repairs or replacements to maintain optimal boiler performance.

At serviceteam Ltd in London, we have accredited gas-safe engineers with the expertise and diagnostic tools to promptly perform boiler repair. Trust our professionals to keep your Worcester Bosch boiler in tip-top condition.


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