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Last updated: 8th November, 2023


Glow-Worm F29 Error Code - How To Fix

Glow-Worm F29 Error Code - How To Fix

Key takeaways

  • The F29 error code indicates a fault in the ignition or flame within a Glow-Worm boiler.
  • Common causes include low gas pressure, faulty gas valves, and ignition lead issues.
  • Understanding the nature of the error aids in deciding between self-fixing or calling a professional for help.

The Glow-Worm F29 error code indicates a loss of flame during operation, which can cause a boiler to stop working and leave you without heating or hot water.

The Glow-Worm F29 error code is a common issue that many boiler owners encounter, which indicates a malfunction within the system. 

Understanding the causes and solutions for this error is essential for homeowners who want to maintain the efficiency and longevity of their boiler. In this article, we will explore the various factors contributing to the F29 error code and provide guidance on how to rectify the issue.

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Glow-Worm boilers are reliable and efficient heating systems, but like all appliances, they can occasionally experience issues. The F29 error code is particularly concerning as it often relates to flame or ignition failures, causing disruptions in heat and hot water supply. 

By learning about the common causes and potential fixes for this error, homeowners can make informed decisions on whether to attempt a repair themselves or seek the assistance of a professional engineer.

Understanding the Glow-Worm F29 Fault Code

The F29 fault code is a common issue encountered by many Glow-Worm boiler users. This fault signifies a problem with the gas supply or a blocked condensate pipe, leading to disruptions in the boiler's operation and potentially causing interruptions in heat and hot water supply. 

Understanding the causes and possible fixes for this fault code is essential for maintaining the efficient performance of a Glow-Worm boiler.

Firstly, it's crucial to identify the specific causes behind the F29 fault code. Some common factors that trigger this error include low gas pressure, incorrect adjustment of the gas valve, a faulty gas valve, a faulty electrode or ignition lead, and dirt or carbon build-up in the burner. 

By identifying the root of the problem, one can take the appropriate steps to rectify the issue and restore the boiler's functionality.

Gas supply issues can be addressed by checking the gas meter and verifying the gas pressure. If the pressure is low, an engineer should be contacted to investigate and resolve the problem. In some cases, the gas valve may need to be adjusted or replaced entirely if found to be faulty.

When dealing with a blocked condensate pipe, it is essential to safely remove any obstructions and ensure proper drainage. Regular maintenance can help prevent blockages and keep the condensate pipe functioning optimally.

If the fault code arises due to a faulty electrode or ignition lead, it is advisable to reach out to a qualified engineer. They will inspect and diagnose the issue, possibly replacing the faulty component to resolve the problem.

Lastly, it is vital to address dirt or carbon build-up in the burner. Regular servicing and cleaning can help prevent the accumulation of such deposits, ensuring the efficient operation of the Glow-Worm boiler.

In summary, understanding the various causes and potential fixes for the F29 fault code is crucial for Glow-Worm boiler users. Tackling the issue in a timely manner can prevent further complications and ensure consistent hot water and heat supply in the property.

Common Causes of the F29 Error

Faulty Gas Valve

A faulty gas valve is one of the possible causes of an F29 error code on a Glow-Worm boiler. The gas valve ensures the correct amount of gas flows to the burner. When it malfunctions, it may lead to low gas pressure, preventing the boiler from operating efficiently. A boiler engineer can examine the gas valve and determine if it needs to be replaced or adjusted. Always consult a professional to diagnose a faulty gas valve.

Ignition Fault

Sometimes, the F29 error code results from an ignition fault. Spark electrodes create a spark to initiate combustion, but when an error occurs, the boiler may experience flame loss. Consequently, the boiler might shut down as a safety measure. An engineer can inspect and replace the spark electrodes or ignition leads, if necessary, to resolve the issue.

Frozen Condensate Pipe

When the condensate pipe becomes frozen, it can trigger an F29 error. A blocked or frozen condensate pipe might prevent excess water from being drained away from the boiler, causing it to lock out as a precaution. Luckily, this issue can be resolved by thawing the frozen pipe and insulating it to prevent future blockages during colder weather.

Low Water Pressure

Low water pressure is another potential cause of the F29 error. If the boiler's water pressure drops too low, it will not operate efficiently, leading to the F29 error code. Several factors like leaks in the central heating system, a faulty pump, or an issue with the heat exchanger may result in low water pressure. It's essential to have a boiler service to diagnose the exact problem and identify a suitable solution.

Electrical Issues

Electrical problems can also cause an F29 error code on a Glow-Worm boiler. Issues with wiring, the PCB, or power supply might affect your boiler's performance and lead to this error. An engineer can inspect the boiler's electrical components and wiring to identify any possible faults and address them accordingly. Always employ a certified professional when dealing with electrical issues to ensure safety and a proper resolution.

When to Call a Professional

Identifying More Serious Issues

When your Glow-Worm boiler displays an F29 error code, it's essential to identify whether it's a simple issue or a more serious problem requiring the assistance of a Gas Safe engineer. Common causes for the F29 fault code can include disruptions in the gas supply, gas pressure issues, ignition faults, or flue blockages. If you suspect any issues that could lead to a potential leak or cause your heating and hot water system to malfunction, contact a professional for assistance.

Options for Boiler Repairs or Replacement

If you're experiencing persistent F29 error codes or other boiler faults, it may be time to consider boiler repairs or even replacement. For a reliable assessment, consult a Gas Safe engineer. They have the expertise to diagnose the problem, suggest appropriate repairs, or recommend a new boiler if necessary. Remember, your family's safety and the efficiency of your heating and hot water system should be your top priority.

Diy Fix for a Frozen Condensate Pipe

Sometimes, an F29 error code can result from a frozen condensate pipe during cold winter months. In such cases, you may attempt a DIY fix by pouring warm (not boiling) water over the frozen pipe to thaw it out. After successfully thawing the pipe, you can reset the boiler and check if it starts working normally. However, if the issue persists or you're unsure about dealing with it yourself, it's wise to seek professional help.

Checking Gas Supply

Before calling an engineer, check your gas supply to ensure it's working as needed. If other gas appliances in your home, like a hob, are functioning correctly, it indicates that your gas supply is not the issue. In contrast, if you encounter problems with other appliances, it could mean there's a lockout or disruption in your gas supply which may fix the F29 error by addressing the supply issue.

Resetting the Boiler

In some cases, the F29 fault code might merely be the result of a temporary glitch or loss of gas. Trying to reset the boiler can help resolve this. If the issue persists after resetting, it's prudent to contact a Gas Safe engineer to diagnose and fix the problem.

Overall, fixing the Glow-Worm F29 error code may require DIY solutions or a professional's intervention, depending on the complexity of the issue. Be proactive in maintaining your boiler's efficiency and safety by seeking timely help when required.

Adjustment of Low Water Pressure

Adjusting the low water pressure in a Glow-Worm boiler can help resolve the F29 error code. The first thing to consider is the pump, which plays a crucial role in maintaining adequate pressure in the system.

To begin with, check for any visible leaks around the boiler and pipework. If there are no obvious leaks, proceed to examine the pump. Ensure that the pump is operating smoothly and is not excessively hot to touch. If it is overheating or not functioning properly, it may be necessary to replace the pump.

Another factor to consider is the pressure relief valve. This valve serves to maintain a safe pressure level within the boiler. If the valve is faulty, it could cause the boiler to lose pressure. Inspect the valve and, if necessary, replace it to restore normal water pressure.

In some cases, the issue may stem from blocked or obstructed pipes. Air pockets or debris within the pipework can prevent water from circulating efficiently, leading to low pressure. Power flushing the system can help eliminate blockages and improve circulation. It is best to consult a qualified engineer to perform this procedure, as it requires specialised equipment and expertise.

Finally, while adjusting the boiler's pressure, pay close attention to the manufacturer's guidelines. The boiler's user manual should provide detailed instructions on how to safely adjust the water pressure. Be sure to follow these guidelines to avoid causing further issues or damage to the boiler.

By addressing low water pressure problems, you can help resolve the F29 error code and restore your Glow-Worm boiler to its proper working condition.

Understanding Other Glow-Worm Error Codes

Many Glow-Worm boilers display a range of fault codes to assist in diagnosing issues. In addition to F29, it's essential to understand other common fault codes in case your boiler encounters a different problem. By comprehending these codes, you'll be better equipped to troubleshoot and potentially avoid costly engineer callouts.

F.00, F.10, and F.11 are indicative of ignition problems, while F.12 signals a flame failure. On the other hand, F.20 and F.22 point towards temperature issues; F.23 and F.24 imply heat exchanger faults. If you spot F.25, F.27, or F.28 on your boiler, these codes are typically linked to air and gas pressure problems.

Furthermore, F.32, F.91, and FA9 hint at water circulation issues, whereas F.61, F.64, and F.67 relate to problems with the gas valve and other gas components. F.70 and F.73 identify faults in the electronic and control modules, while F.71, F.72, and F.75 target issues with the gas supply.

Should you encounter F.77, it suggests a damaged combustion chamber or water ingress; F.82, F.83, F.84, and F.85 highlight faults with the interface or connections between electronic components. Lastly, F.87, F.88, and F.89 illuminate issues with the pressure sensor or pressure monitoring system.

Although not exhaustive, this list of Glow-Worm boiler fault codes helps identify many possible issues. Errors such as F.02, F.05, F.06, F.08, F.09, F.10, F.13, F.14, F.15, F.20, F.43, F.70, F.73, and others may also be encountered, so it's crucial to consult your boiler manual for the entire list of codes and their meanings. Remember that, when in doubt, it's always best to consult a qualified professional for diagnosing and repairing boiler faults.

Prevention Measures for Future Occurrences

Taking preventative measures can significantly reduce the chances of encountering a Glow-Worm F29 error code in the future. By implementing regular maintenance and addressing potential issues, homeowners can ensure their boilers remain in optimal working condition.

One crucial aspect of prevention involves scheduling regular boiler servicing. Typically, it is advisable to have a professional engineer examine your system annually. Not only can they identify warning signs, but they can also fine-tune the boiler's performance. Regular servicing can reveal faulty gas valves, dirty burners, and ineffective ignition leads, paving the way for prompt repairs and preventing F29 errors from occurring.

Adjusting the gas valve is another vital preventative measure. An incorrect adjustment can lead to low gas pressure and ultimately result in an F29 error. By monitoring and adjusting the gas valve, homeowners can keep their boiler's gas flow at an appropriate level. This helps to maintain the boiler's efficiency and avoid potential problems related to inadequate gas pressure.

Ensuring proper gas supply is vital for the functioning and longevity of the boiler. If you have a prepayment gas meter, make sure you maintain sufficient credit. Running out of gas can trigger an F29 error and temporarily leave you without heat.

Lastly, keep an eye on your boiler's flue. Regular inspection can help identify blockages or obstructions, allowing for their swift removal. A clean, well-ventilated flue is essential for safe and efficient boiler operation.

In summary, diligent maintenance involving regular boiler servicing, gas valve adjustments, proper gas supply, and flue inspections can help prevent future F29 error code occurrences. Taking these measures will ensure the longevity and efficiency of your Glow-Worm boiler system.

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Frequently Asked Questions

What does F29 mean on a Glow-Worm boiler?

The F29 error code on a Glow-Worm boiler indicates a flame failure, which means the boiler's flame has gone out. This can result in disruptions in heat and hot water supply. There could be various causes for this issue, such as low gas pressure, incorrect adjustment of the gas valve, a faulty gas valve or electrode, or dirt and carbon build-up in the burner.

How do I fix error F29 on my boiler?

First, ensure the gas is turned on at the gas meter. If you have a prepayment gas meter, make certain you are in credit. Low gas pressure, a faulty gas valve, a problematic electrode or ignition lead, or dirt and carbon build-up in the burner could also be potential causes of the F29 error code. To properly diagnose and fix these issues, you may need to seek the assistance of a qualified engineer.

What is the fault code F28 F29?

The fault codes F28 and F29 are related to flame failures in Glow-Worm boilers. While F28 refers to a failure in establishing a flame, F29 indicates that the flame has gone out after being successfully ignited. Both situations can result in a loss of heating and hot water.

How do I reset my Glow-Worm boiler?

To reset a Glow-Worm boiler, locate the reset button on the front panel of the boiler (it may be marked with an "R" or a circular arrow icon). Press and hold the reset button for approximately three seconds, then release it. Your boiler should now restart, clearing any current error codes. If the issue persists, consult a qualified engineer for further assistance.

What is an F29 fault code?

The F29 fault code refers to a flame failure in the boiler, which results in disrupted heating and hot water supply. This error could be due to a variety of issues, including problems with gas supply, gas pressure, ignition, or flue blockages.

What is the fault code 29?

Fault code 29 is a generic code referring to a flame failure in boilers, of which F29 is a specific instance found in Glow-Worm boilers. This error can lead to disruptions in the supply of heat and hot water, stemming from issues such as gas supply, gas pressure, ignition, or flue blockages.

How do I reset my fault code?

Resetting a fault code typically involves pressing the reset button on the front panel of the boiler. Hold the button down for approximately three seconds to clear the fault code and restart the boiler. If the boiler continues to display the same fault code or the issue persists, it is advisable to contact a qualified engineer for further assistance.

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Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.