How to Fix E168 Potterton Boiler Fault?

What is the E168 Potterton Boiler Fault?

The Potterton E168 fault code indicates a general fault within your boiler system.

It often appears when the boiler has tried and failed to resolve another issue, or after an unstable power supply has disrupted its regular operation.

This error is common across several models, including the Potterton Promax range. It can be triggered by a number of underlying problems, from simple electrical glitches to more complex internal component failures. Identifying the root cause is more important for a lasting solution.

Always reach out to a professional boiler repair service to ensure the job is handled safely and correctly.

What Causes the E168 Potterton Boiler Fault?

Several issues can trigger the E168 boiler fault. While some can be addressed with a simple reset, others require the expertise of a qualified engineer. Here are the most common culprits.

One of the most frequent reasons for an E168 fault is the boiler's inability to ignite or detect a stable flame. For your boiler to heat water, it must successfully light the gas and confirm that the flame is present and steady. If this process fails, the system will lock out for safety.

This can be caused by:

• Dirty or faulty flame sensor: This component detects the flame. If it's covered in carbon deposits or has failed, it can't send the correct signal to the Printed Circuit Board (PCB).
• Damaged or misaligned ignition electrode: The electrode creates the spark that ignites the gas. If it's worn, cracked, or not positioned correctly, it won't be able to light the boiler.

To learn more about ignition faults, have a look at our blog “How to Fix an Ignition Fault on a Boiler.”

Potterton boilers, like all modern heating systems, rely on a consistent and stable electrical supply to function correctly. The E168 fault code can appear if the mains power is interrupted or if the voltage fluctuates outside the acceptable range.

This could be due to a power cut in your area, faulty wiring in your home, or even a problem with the boiler's internal electrical connections.

The Printed Circuit Board (PCB) is the 'brain' of your boiler, controlling and coordinating all of its components. If the PCB is faulty, it can send incorrect signals or fail to process information from sensors, leading to a range of errors, including the E168 code.

A damaged PCB often requires a full replacement by a qualified engineer.

The E168 code can also be a symptom of a problem with other internal parts of the boiler. These components work together to ensure your boiler operates safely and efficiently.

Potential failures include:

• A faulty gas valve: If the gas valve is stuck or not opening correctly, it can prevent gas from reaching the burner for ignition.
• A malfunctioning fan: The fan's job is to safely remove harmful flue gases from the system. If it fails, the boiler's safety sensors will prevent it from firing up.
• A failing pump: The pump circulates hot water around your heating system. A fault here can cause the boiler to overheat and lock out.

How to Troubleshoot the E168 Potterton Boiler Fault

Before calling an engineer, there are a few simple checks you can perform yourself. These steps can sometimes resolve the issue or, at the very least, help diagnose the problem more accurately.

The first and easiest step is to reset your boiler. A simple reset can often clear temporary glitches, especially those caused by a brief power interruption. To do this, locate the reset button on your Potterton boiler; it's usually marked with an 'R' or a flame icon. Press and hold it for a few seconds until the boiler begins its startup sequence. If the boiler fires up and operates normally, the problem may be solved. However, if the E168 code reappears, you'll need to investigate further.

Sometimes, the E168 fault appears after another error code has been cleared or has occurred previously. Think back to whether you saw any other codes on the display before E168.

Common preceding faults include low water pressure (E119) or a sensor fault (Potterton E133 fault). If another code was present, that is the root problem that needs to be addressed. For example, if your system pressure is too low, you will need to re-pressurise your boiler.

Ensure your boiler is receiving power. Check your home's main fuse box to see if any switches have tripped. If you've recently experienced a power outage, the E168 code may be a residual effect. A reset should clear it, but if the issue persists, there may be a problem with the power supply to the boiler itself. For safety reasons, only a qualified electrician or Gas Safe engineer should inspect the boiler's internal wiring.

If you've tried resetting the boiler and the E168 fault code continues to appear, it's time to call a professional. Do not attempt to open the boiler casing or interfere with its internal components yourself. This is not only dangerous but can also cause further damage and invalidate your boiler's warranty.

A Gas Safe registered engineer has the training, tools, and experience to diagnose and repair the fault safely. They will be able to test the electrical supply, clean or replace sensors, and inspect the PCB, gas valve, and other critical parts.

Need a Potterton Boiler Repair Expert in London?

Handling a faulty boiler can be challenging, especially when the weather turns cold. At Serviceteam, our Gas Safe-registered engineers are experts in diagnosing and fixing all Potterton boiler faults, including the persistent E168 code. We serve homeowners and landlords across London, providing fast, reliable, and professional boiler repair services.

Don't let a boiler fault leave you in the cold. Our boiler repair team is ready to restore your heating and hot water with minimum fuss.

Prevent Future Faults with Regular Boiler Maintenance

The best way to avoid unexpected boiler breakdowns is with regular annual servicing. A yearly check-up from a qualified engineer ensures that all components are clean, safe, and working efficiently. This preventative maintenance can identify potential issues before they become major problems, extending the lifespan of your boiler and giving you peace of mind.

Serviceteam offers comprehensive boiler maintenance plans for landlords and homeowners throughout London. Contact us today to book your annual service and keep your Potterton boiler in peak condition.

Get Your Boiler Fixed Today

If you're facing a Potterton E168 fault, there's no need to wait. Contact Serviceteam for a prompt and professional repair. Our friendly team is on hand to schedule a visit from one of our experienced Gas Safe engineers at a time that suits you.

Book your Potterton boiler repair online or call us today to get your heating system up and running again.

Frequently Asked Questions

The E168 error code on a Potterton boiler, including the Potterton Promax 24 HE Plus, usually indicates an ignition or flame detection issue. Common causes include a faulty flame sensor, dirty or misaligned electrodes, or problems with the gas valve.

Yes, a boiler can lose pressure even when no leak is visible. Common causes include trapped air in the system, a failing expansion vessel, or hidden pipework issues you may not notice. Topping up the pressure once in a while is normal, but if it keeps dropping, it usually points to an underlying fault. To stay safe and prevent further damage, contact a Gas Safe boiler repair engineer if your boiler pressure continues to fall.

No. The E168 error relates to electrical faults inside the boiler. Attempting a DIY fix is unsafe and can cause further damage. Always call a Gas Safe engineer or qualified boiler repair professional to diagnose and repair the issue safely.