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Last updated: 17th April, 2024


Worcester Bosch C6 Boiler Error Code

Worcester Bosch C6 Boiler Error Code

Key takeaways

  • The Worcester Bosch C6 error code normally indicates an issue with the flue or boiler fan.
  • It's always best to leave error code fixes to the professionals, our iHeat Gas Safe engineers are experts in boiler maintenance.
  • In some cases, it makes the most sense to replace an old boiler that's having issues, with a robust, modern boiler, saving you expenses long term.

When it comes to home heating, a reliable and efficient boiler is essential. However, boiler issues can arise, and understanding error codes is crucial for troubleshooting and resolving problems promptly.

In this blog post, we'll focus on the Worcester Bosch boiler error code C6. We'll explore its meaning, potential causes, and suggested fixes.

Also we will discuss the advantages of upgrading or replacing your boiler with a modern, more efficient model if the C6 error persists or if your boiler is completely broken.

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What Does the C6 Error Code Mean?

Worcester Bosch boilers display error codes to help homeowners identify and address specific issues. The C6 error code typically indicates a problem with the fan or flue. 

The boiler's fan plays a vital role in proper combustion, while the flue ensures the safe discharge of combustion gases from the boiler to the outside.

Potential Causes of Error Code C6:

Fan Fault 

A faulty or malfunctioning fan can trigger the C6 error code. This may be due to a worn-out fan motor, damaged fan blades, or an obstruction preventing the fan from operating correctly.

Flue Blockage

A blockage or restriction in the flue can also trigger the C6 error code. This can be caused by debris, birds' nests, or other obstructions, preventing the proper exhaust of combustion gases.

Air Pressure Switch Issue

The C6 error code may also indicate an issue with the air pressure switch, which is responsible for monitoring and ensuring the correct airflow within the boiler. A malfunctioning pressure switch can prevent the fan from operating correctly, triggering the error code.

Potential Fixes for Error Code C6

While some DIY fixes are possible for certain boiler issues, the C6 is a complex problem that will require the expert services of a Gas Safe registered engineer.

How Will an Engineer Fix the C6?


Check and Clean the Fan

The engineer will carefully inspect the fan for any visible signs of damage or blockage. They will ensure it spins freely without obstruction.

If there is accumulated dust or debris affecting its performance, they will clean the fan blades meticulously. If the fan is found to be damaged or worn out, the engineer will suggest a replacement.

Clear Any Flue Obstructions

The engineer will thoroughly examine the flue for any obstructions and remove them with caution. Following safety guidelines, they will ensure the boiler is turned off before attempting 

Check Air Pressure Switch

The air pressure switch associated and tubing will be inspected by the engineer for any damages or blockages. 

They will clear any obstructions and verify the proper functioning of  the switch. If the air pressure switch is found to be faulty, the engineer will conduct testing and replace it accordingly.

Engineer Costs

The cost of an engineer assessing and fixing any C6 related issues will be dependent on that particular engineer or organisation’s work rate fees.

Here at iHeat we offer boiler servicing by an expert Gas Safe engineer as even without any signs of damage, your boiler would benefit from a yearly inspection to make sure everything is working as it should.

Why Upgrade or Replace with a Modern Boiler?

If the C6 error persists despite attempting the suggested fixes or if your boiler is completely broken, it may be an opportune time to consider upgrading or replacing your boiler with a modern, more efficient model. Here's why:

Improved Efficiency

Modern boilers are designed with advanced technology and higher energy efficiency ratings. Upgrading to a modern boiler can result in significant energy savings and lower heating bills in the long run.

Enhanced Performance

Newer boilers offer improved performance and reliability. They incorporate intelligent features and controls, allowing for better temperature management, increased comfort, and optimised energy usage.

Reduced Carbon Footprint

Older boilers are often less eco-friendly and contribute to higher carbon emissions. Upgrading to a modern, environmentally conscious boiler can help reduce your carbon footprint and support sustainability efforts.

Long-Term Cost Savings

While the upfront cost of a new boiler may seem significant, the long-term cost savings in energy bills, repairs, and maintenance can make it a wise investment. 

Additionally, many manufacturers offer extended warranties on new boilers, providing added peace of mind.

Smart Home Integration

Modern boilers can be integrated into smart home systems, allowing for remote control, scheduling.


Signs You Should Upgrade

Apart from the obvious complete breakdown, there are several signs to keep on the lookout for that may be warning you that your boiler is on its way out.

Leaks can be fixed depending on their severity, but should always be treated as a priority issue that if sizeable or fast flowing can be a major problem, and needs rectifying ASAP.

Repeated error codes can also be a cause for heating concern especially if they result in a boiler being ‘locked out’ (system forced shut down) for damage limitation purposes.

If your boiler regularly needs some kind of maintenance, or performs sub-optimally most of the time there may be serious component issues.

Emergency Replacement

Any boiler issue is obviously important to get remedied as soon as possible, but in a triage system of urgency, some issues take precedence.

You can consider any of the following an emergency boiler matter:

  • No heating or hot water during winter (especially important if you have children in the home)

  • Water is streaming out of a boiler or pipe at a very quick rate


Is It Worth Getting A New Gas Boiler?

Despite recent misconceptions that there is a looming ‘ban’ on gas boilers, this is actually incorrect!

It’s still completely legal to buy and install a new gas boiler in any type of property, the supposed ‘ban’ only applies to new build properties after 2025.

There is no current financial penalty to keeping an existing gas boiler in any type of property past 2025, or installing a new gas boiler in any pre existing property past 2025.

New gas boilers blend efficiency, safety, cost effectiveness and versatility, hence their constantly rising popularity.

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Frequently Asked Questions

What Does C6 Mean on My Worcester Boiler?

Error code C6 on a Worcester boiler typically indicates a problem with the fan speed being outside the expected range. This issue can arise if the fan is malfunctioning, there is a blockage affecting the fan, or there is an issue with the fan’s power supply or control board. The fan is essential for safely venting harmful gases produced during combustion, and a malfunction can pose safety risks.

What is Code C6?

Code C6, when displayed on a Worcester boiler, specifically refers to an error involving the operation of the boiler's fan. The error code suggests that the fan speed is not aligning with the boiler's operational parameters, which might be due to a variety of issues such as a mechanical fault within the fan, electrical issues affecting the fan's operation, or obstructions that hinder the fan’s rotation.

How Do I Clear the Error Code on My Worcester Boiler?

To clear an error code on your Worcester boiler:

  • Try a Simple Reset: Press the reset button on your boiler, usually located on the boiler’s front panel. Hold it for about three seconds or until the system restarts.
  • Power Cycle the Boiler: If the error persists after a reset, turn off the boiler at the mains, wait a few minutes, then turn it back on. This can help reset the system’s electronic controls and potentially clear the error.
  • Consult the Manual: Check your boiler's manual for specific instructions related to clearing error codes, as there may be additional steps or considerations for your particular model.

How Do I Clear the Error Code on My Boiler?

Clearing an error code generally involves:

  • Resetting the Boiler: Most boilers can be reset using a dedicated reset button or switch.
  • Power Cycling: Turn off the power to the boiler at the fuse box, wait a few minutes, and turn it back on to reset the system.
  • Check the Boiler's Display Panel: After resetting, observe the display panel to see if the error code reappears, indicating further troubleshooting or professional repair might be needed.

What Happens When You Press the Reset Button on a Worcester Boiler?

Pressing the reset button on a Worcester boiler typically clears temporary error codes and restarts the boiler’s operations. This can resolve minor issues that cause the boiler to lock out. However, if there is a persistent underlying issue, the error code is likely to reappear soon after reset. Frequent resets without addressing the root cause can potentially worsen any problems.

Is it Safe to Reset a Worcester Boiler?

Yes, it is generally safe to reset a Worcester boiler using the provided reset button. This feature is designed for user safety and convenience, allowing you to attempt a basic troubleshooting step without requiring technical expertise. However, if the boiler continues to display the same error code or shows signs of a serious malfunction, it’s advisable to contact a professional for a detailed diagnosis and safe resolution. Frequent need for resets can be a sign of a more serious issue that needs professional attention.

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