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Last updated: 12th July, 2024


Potterton Boiler Flashing Green

Potterton Boiler Flashing Green

Key takeaways

  • The flashing green light indicates an issue with the boiler’s ignition or operation.
  • Simple resets can sometimes fix the issue, but professional help may be required.
  • Regular maintenance can prevent minor faults from becoming major problems.

A Potterton boiler displaying a flashing green light can indicate various issues. When no error code is present, the problem might be challenging to diagnose. This light often means the boiler is in a standby mode or not operating due to a minor fault.

When a Potterton boiler starts flashing green, it can be a cause for concern. Homeowners have experienced the issue, and it usually indicates that the boiler is calling for heat but not firing up correctly. This flashing green light can often be seen on models like the Suprima 30L and 50L, leading to confusion and frustration.

The flashing green light on a Potterton generally means the boiler is not properly igniting or maintaining operation. This can be due to various reasons including faults in the ignition system, gas supply issues, or problems with the central heating pump. Sometimes, these issues can be fixed with a simple reset, but it's crucial to understand what might be causing the problem.

To avoid further complications, it's recommended to check your boiler’s manual and see if the error can be easily resolved. If the problem persists or you're unsure, contacting a Gas Safe engineer is the safest course of action. Proper maintenance and fixes can prevent minor issues from becoming major repairs, ensuring your boiler runs efficiently and safely.

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What Is a Boiler Error Code?

Boiler error codes serve as signals indicating specific issues within your heating system. Understanding these codes is crucial for maintaining and troubleshooting your boiler effectively.

Explain What Boiler Error Codes Are in General

Boiler error codes are alphanumeric codes shown on the boiler’s display panel to identify faults. When something goes wrong within the boiler, an error code is generated to help pinpoint the issue. This could involve problems with pressure, temperature, ignition, or different components like the fan or gas valve.

By recognising these codes, homeowners and technicians can quickly determine what needs to be fixed. For instance: A Potterton boiler might show an E1 code indicating a pump overrun, meaning the pump keeps running when it shouldn’t.

Importance of Understanding Error Codes for Boiler Maintenance

Knowing what each error code means helps in maintaining the boiler more efficiently. It allows for faster responses to faults, reducing downtime and potential damage.

Scheduled maintenance can prevent many common issues that error codes indicate, like blockages in the flue or problems with water flow switches. Instead of guessing what's wrong, technicians can directly address the specific fault, saving time and money. Example: Addressing a flashing red light on a Potterton Suprima boiler might involve checking the gas supply or ignition system, guided by the error codes displayed.

No Actual Error Code, Potterton Boiler Flashing Green

A Potterton boiler displaying a flashing green light can indicate various issues. When no error code is present, the problem might be challenging to diagnose. This light often means the boiler is in a standby mode or not operating due to a minor fault.

Possible causes for a flashing green light without an error code:

  1. Low System Pressure: Check the pressure gauge. If it’s below the recommended level (usually 1-1.5 bar), refill the system.

  2. Condensate Pipe Blockage: The condensate pipe could be blocked or frozen, preventing the boiler from functioning properly.

  3. Airlock in the System: Air trapped in the heating system can cause the boiler to flash a green light. Bleeding the radiators might help resolve this.

  4. Power Supply Issues: Ensure the boiler is receiving a stable power supply. Check fuses and switches.

If these solutions don't resolve the issue, it might involve components within the boiler. These could include:

  • Thermostat: Verify that the room thermostat is set correctly.

  • Fan Operation: The fan might not be functioning or recognised, leading to the boiler not starting up.

  • PCB (Printed Circuit Board): The control board may need resetting or replacement.

Checklist for Troubleshooting

  • Check system pressure.

  • Inspect condensate pipe.

  • Bleed radiators.

  • Verify power supply.

  • Confirm settings on the thermostat.

  • Ensure fan operation.

In case of persistent issues, contacting a qualified heating engineer is recommended to avoid causing further damage to the boiler.

What Does Potterton Boiler Flashing Green Mean?

When a Potterton boiler is flashing green, it typically signals a problem that needs addressing. Understanding the specific cause of this indicator can help you determine the necessary steps to take for a solution.

Detailed Description of This Issue

A flashing green light on a Potterton boiler is a sign that the boiler is in a state where it cannot operate properly. This light usually means that the boiler is in standby mode or has encountered an error that prevents it from firing up.

The flashing green light can indicate that certain safety checks have not been completed, or that there is a minor issue like a temporary loss of pressure. It’s essential to interpret this signal correctly to avoid further complications with your heating system.

Possible Reasons Why This Has Occurred

There are several possible reasons why your Potterton boiler may be flashing green:

  • Pressure Issues: If the boiler pressure is too low or too high, it can cause the system to go into standby mode.

  • Faulty Pump Seal: A faulty boiler pump seal can lead to flashing green lights, indicating that the system is unable to circulate water properly.

  • Blockages and Sludge Build-Up: Blockages or sludge build-up in the system can restrict water flow, causing the boiler to halt its operation.

  • Error Codes: Specific error codes may accompany the flashing light, which can provide more detailed information about the fault. Common codes include E160 and E161.

  • Safety Checks: The boiler’s internal safety checks, such as ensuring the fan is operational, may not have completed correctly, leading to the flashing green indicator.

By identifying the cause, you can take the appropriate action to fix the issue and restore your boiler to normal working condition.

Signs of Potterton Boiler Flashing Green

When a Potterton boiler flashes a green light, it signals specific issues within the system that need attention. Understanding these signs can help in diagnosing and resolving the problem effectively.

List and Explain Common Signs and Symptoms That Indicate This Specific Issue

Flashing Green LightThe most obvious sign is the consistent flashing green light on the boiler's control panel. This indicator shows that the boiler is not operating as it should and may be in "lockout" mode.

Strange NoisesIf the boiler makes unusual whirring or clicking noises, it might indicate that certain components like the fan are not working properly. These noises can point to internal problems that need checking.

Fault CodesSome Potterton models display fault codes alongside the flashing green light. These fault codes can help identify the specific issue, such as pressure or ignition problems. For example, E160 and E161 codes are related to fan issues.

Boiler PressureA drop or rise in boiler pressure often accompanies the flashing green light. It indicates that the system pressure is not within the recommended range, which can lead to operational problems.

Ignition FailuresWhen the boiler fails to ignite, it may cause the green light to flash. This failure can result from various issues, including gas supply problems or defective ignition components.

Temperature Control IssuesProblems with temperature control, such as the boiler shutting down shortly after starting, can trigger the green light. This can happen if the boiler incorrectly reads the system temperature, thinking it's up to the desired level too soon.

Regular maintenance and prompt attention to these signs can help maintain the reliability of the Potterton boiler and ensure it functions efficiently.

Can I Fix This Issue Myself?

You may be able to fix some issues with your Potterton boiler if it has a flashing green light. Simple checks and repairs can sometimes resolve the problem, while more complex faults may need a professional's help.

DIY Tips for Resolving the Issue

Start by checking for loose or damaged wiring. Ensure all connections are secure and wires are intact. This can often be the cause of signal issues.

Look at the air pressure switch. Make sure it's not faulty and replace it if necessary. The switch should send correct signals to the boiler.

Inspect the PCB (Printed Circuit Board). Sometimes, a broken PCB can be the source of the issue. You might notice obvious signs of damage like burns or a smell of burnt electronics.

Check the fault codes displayed by the boiler. Fault codes can give a clear idea of what might be wrong. Refer to the boiler's manual or online resources for specific codes and their meanings.

Warnings or Advice on When to Avoid DIY and Seek Professional Help

There are times when DIY repairs are not safe or effective. If you are unsure about your ability to safely repair electrical components or if the problem persists after you have tried the basic fixes, it's best to call a professional.

A registered Gas Safe engineer should handle gas-related issues. Handling gas without proper knowledge and equipment can be dangerous.

If you experience complex fault codes or issues that are not easily diagnosed, a professional's expertise can save time and prevent further damage. For instance, persistent problems with the PCB or intricate wiring issues need specialised knowledge that a typical DIYer might lack.

Using forums like DIYnot and seeking advice from experienced tradespeople can also provide guidance on whether an issue is within DIY scope.

Do I Need to Contact a Gas Safe Engineer to Fix This Issue

When a Potterton boiler shows a flashing green light, it may signal various issues that require professional help. This section explores when it’s necessary to call a Gas Safe engineer and explains their role and importance.

Advice on When It's Necessary to Call a Professional

If your Potterton boiler's green light is flashing, it could indicate multiple problems. Some minor issues might be solved with a simple reset. However, if the flashing persists or is accompanied by fault codes, it's best to contact a professional.

Fault codes like E119, E160, or E161 suggest specific problems needing expert attention. It’s crucial not to ignore these codes, as they can impact your heating system's safety and efficiency. A professional can diagnose and fix the problem accurately, ensuring your boiler operates safely.

Additionally, any issues related to the gas supply or unusual noises from the boiler should prompt an immediate call to a Gas Safe engineer. Attempting to fix gas-related problems yourself can be dangerous.

Explanation of What a Gas Safe Engineer Is and Why Their Expertise Is Important

A Gas Safe engineer is a registered professional qualified to work on gas appliances, including boilers. They have passed industry-recognised qualifications and hold a unique ID card issuable annually. This registration ensures they comply with UK safety regulations.

Using a Gas Safe engineer is essential for several reasons. Firstly, they can accurately diagnose issues in your Potterton boiler, thanks to their specialised training. Secondly, they ensure all repairs comply with safety standards, which is critical for preventing gas leaks or other hazards.

If your boiler repair needs to uphold warranty conditions, work must be done by a Gas Safe registered engineer. This ensures the repair is recognised and valid, protecting your investment in the heating system.

How Much Does Fixing a Potterton Boiler Flashing Green Cost?

When a Potterton boiler flashes green, the cost of fixing it can vary. The total cost depends on several factors like the type of fix required and the rates of the gas engineer.

General Cost Range for Fixing This Issue

The cost to fix a flashing green light on a Potterton boiler typically ranges from £100 to £500. Simple repairs, such as resetting the boiler or replacing a small part, usually cost less. A new printed circuit board (PCB) might be needed, which could increase the cost.

Also, emergency call-out charges might be higher, especially if a gas engineer is required outside normal working hours.

Factors That Might Affect the Cost

Several factors can affect the cost of fixing a Potterton boiler:

  1. Type of Repair Needed: Replacing a small part is cheaper than installing a new PCB or other major components.

  2. Labour Rates: Gas engineers have different rates. Some charge hourly, while others might offer fixed rates.

  3. Location: Costs can vary depending on where you live in the UK. Urban areas may have higher labour costs.

  4. Warranties: If the boiler is still under warranty, the cost might be significantly lower or even free.

  5. Age of Boiler: Older boilers might need more parts replaced, increasing the overall cost.

Do I Need a New Boiler?

When dealing with a Potterton boiler flashing green, it is important to decide whether you need a repair or if it's time for a new boiler. Several factors will help you make that decision, such as the cost of repairs, the age of the current boiler, and typical lifespan comparisons.

Criteria to Decide Whether a Repair Is Sufficient or If a New Boiler Is Required

Several criteria can help you determine if a repair is enough or if a new boiler is the best option:

  • Frequency of Repairs: If repairs are becoming frequent and costly, replacing the boiler might be more economical.

  • Cost of Repair vs Replacement: If the repair costs approach 50% of the price of a new boiler, it might be wise to invest in a new unit.

  • Component Availability: For older models, parts might be harder to find or more expensive, making a replacement a better choice.

  • Safety Concerns: Any issue that poses a safety risk should prompt a consideration for a new boiler, as newer models have better safety features.

Information on the Lifespan of Boilers and When Replacement Is Typically Recommended

Boilers generally have a lifespan of 10-15 years.

  • Age of the Boiler: If your Potterton boiler is over 10 years old, it may be nearing the end of its efficient life.

  • Efficiency: Modern boilers are more energy-efficient. An older boiler may result in higher energy bills.

  • Regulation Compliance: Newer models comply with the latest standards and regulations, which may not be the case with older units.

New Boiler Costs

The cost of a new boiler can vary based on several factors:

  • Type and Model: Different types of boilers (combi, system, or conventional) come at different price points.

  • Installation Fees: These can add significantly to the overall cost. Complex installations may cost more.

  • Brand and Warranty: Trusted brands like Potterton might come with a higher upfront cost but offer extended warranties.

Here's a basic table to give an idea:

Boiler Type

Average Cost (Inc. Installation)

Combi Boiler

£1,500 - £3,000

System Boiler

£2,000 - £3,500


£2,000 - £4,000

When considering a new boiler, it's crucial to weigh these costs against the long-term benefits of increased efficiency and reliability.


When a Potterton boiler shows a flashing green light, it often indicates a "call for heat." This mode is normal during startup. If the green light continues to flash without the boiler igniting, there may be an issue.

Common problems causing this could include:

  • Pressure or temperature issues.

  • Ignition or gas supply problems.

  • Faulty components such as the fan or PCB (Printed Circuit Board).

Consult the fault codes displayed on the boiler. These codes can help identify the specific issue.

For example:

  • *E160, *E161 - Fan problems.

  • Continuous green flashing - May indicate pump overrun issues on the PCB.

It's important to address these problems promptly. Proper diagnosis often requires a professional heating engineer. They can safely and accurately identify and fix the fault.

Regular maintenance and timely repairs can help ensure the reliability and efficiency of the boiler. If unsure, refer to the user manual or seek professional assistance.

Make sure to keep an eye on the boiler's lights and fault codes to maintain its good working condition.

iHeat Boiler Service

At iHeat all of our subcontracted engineers are Gas Safe registered and can service your boiler swiftly and safely. Prices of an expert boiler service with iHeat start from £99.These figures might fluctuate regionally and can also depend on the specific type of boiler you own, such as a combi, gas, or oil boiler. 

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iHeat New Boiler Cost

New boilers can be a daunting purchase for many people as they’re an appliance with a lot of responsibility, providing heat for you and your family is something you want to get right. Boilers aren’t exactly a quickly disposable item either, potentially lasting you a decade.

Effectively, new boiler cost can be split into two segments: the first is the actual boiler itself (unit price), and the second is the cost of the boiler being installed (set up) in your property by an expert engineer. 

Here at iHeat, we remove all of this undue stress and make the decision making process of upgrading to a new heating system, as easy as possible.

New boiler costs can vary depending on a number of factors including their brand, model, fuel, output, warranty, labour and boiler installation type. Typically a new boiler will cost between £1,845 and £3,500, below is a list of average boiler installations offered by iHeat (guide only).

Installation Type

Price (inc VAT)

Combi to combi swap


Get a quote

System to combi conversion


Get a quote

New boiler install


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Back boiler to a combi


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System to system


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Frequently Asked Questions

Why is the green light flashing on my Potterton boiler?

A flashing green light on a Potterton boiler typically indicates that the unit is calling for heat. It may be waiting to ignite or there could be a system fault, such as a problem with the thermostat or a blocked flue.

Why is my Potterton boiler flashing?

Flashing lights on Potterton boilers often indicate specific issues. A green flashing light usually means the boiler is in standby mode. Different coloured lights might indicate faults like pressure or temperature issues that require attention.

How to reset a Potterton boiler?

To reset a Potterton boiler, locate the reset button on the control panel. Hold the button for a few seconds until the boiler restarts. Refer to the user manual for specific instructions as procedures can vary by model.

Why is my Potterton boiler not igniting?

If your Potterton boiler isn't igniting, it could be due to issues such as a lack of gas supply, ignition problems, or blockages within the system. Ensure the gas supply is on and check for any fault codes displayed on the control panel.

How do you fix a boiler that won't ignite?

To fix a boiler that won't ignite, start by resetting it. Verify the gas supply, ensure the thermostat is correctly set, and check for any visible issues like blockages or fault codes. If problems persist, contact a qualified engineer for further diagnosis.

How do you reset the ignition on a boiler?

Resetting the ignition on a boiler involves locating and pressing the reset button on the front panel. Hold it down for several seconds until the boiler starts to reset. For detailed steps, consult the boiler's user manual.

Why is the ignition light not coming on my boiler?

The ignition light on a boiler may fail to come on due to issues like a faulty ignition lead, blocked flue, or gas supply problems. Ensure the boiler has gas and that the ignition system is functioning correctly. Seek professional assistance if needed.

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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.