🕑 11 minutes read

Boiler problems are the last thing you want to happen, especially during winter. Regardless of your boiler type, every boiler has issues over time.

When considering boilers, Idel is one of the most common boiler types in the UK household. The L2 boiler fault is one of the common boiler problems in the Ideal Logic boiler series.

If you are facing an L2 fault code on your Ideal boiler, Don't worry. This blog post will explain what an L2 fault code means, what causes it, and, most importantly, how to fix it. So let's get started!

What is L2 Boiler Fault?

The Simple answer is boiler has lost its flame.

L2 boiler fault is visible on Ideal boiler's PCB

The L2 boiler fault code indicates an ignition/flame issue with Ideal Logic boilers. Boilers are designed to prevent gas leaks without ignition, ensuring safety.

“The L2 fault code indicates a boiler issue that causes the flame to go out, resulting in a lockout. Until the underlying problem is resolved, your boiler will not be operated.”

This problem is typically caused by a gas supply issue or component failure, both of which require the expertise of a gas-safe engineer. To resolve the Ideal L2 Boiler Fault Code, we suggest getting help from a Gas Safe registered engineer. They are trained to diagnose and repair your boiler and the underlying cause of the code.

Which Ideal Boiler Model Displays The L2 Fault Code?

The Ideal Logic boiler, a popular model from Ideal Heating, uses the L2 fault code.

This code is applicable to all three types of boilers within the Ideal Logic range: combi boilers, system boilers, and heat-only boilers.

Logic Combi Boiler Logic Combi Boiler
Logic System BoilerLogic System Boiler
Logic Heat-only BoilerLogic Heat-only Boiler

If your boiler is over 10 years old, it's advisable to consider a replacement to avoid potential issues, high repair costs, and increased gas bills.

If you want a boiler replacement, contact serviceteam and get a quick fixed-price quote online in under 30 seconds.

What Causes an L2 Fault Code?

There are a few potential reasons why your Ideal boiler might be showing an L2 fault on the boiler. Here are some possible causes:

  • Frozen Condensate Pipes: In freezing weather, pipes may freeze, causing the fault.
  • Faulty flame sensing electrode: Over time, it can become dirty or damaged, affecting its ability to detect the flame and resulting in an L2 boiler fault.
  • Faulty wiring: The wiring connecting the flame sensing electrode to the PCB could be damaged or loose, preventing the signal from being properly sent.
  • Blocked flue: A blocked flue prevents proper ventilation and can cause the flame to go out, triggering an L2 fault code.
  • Faulty Spark Generator: Issues with the spark generator can contribute to ignition faults.
  • Faulty Spark Electrode: Problems with the spark electrode may lead to a fault.
  • Low Gas Pressure: If the gas pressure is too low, it can prevent the boiler from igniting and lead to an L2 fault code.
  • Faulty Gas Valve: A malfunctioning gas valve could be a potential cause.
  • Gas Leak: A gas leak can also be a serious cause of the Ideal boiler L2 fault.
ice-deposit-on-a-condensate-pipe-in-winter [IMPORTANT]
If you experience an 'L2’ boiler fault during the winter, the first step is to check for frozen condensate pipe, as it is highly likely to be the cause.

Then, contact our help desk or schedule an appointment with a qualified gas-safe engineer. We are here to provide 24/7 assistance and ensure your safety.

How Does Ideal Boiler Ignition/Faulty Happen?

Flame Sensor Failure

The main reason for L2 boiler fault code is a problem with the flame sensor on your Ideal Logic boiler. The Printed Circuit Board (PCB) is the control centre of your boiler. So, it requires a signal from the

flame sensor to detect the presence of a flame. However, it will shut off the gas supply if it doesn't get this signal.

Fixed an L2 error code in an Ideal Boiler in London

serviceteam fixed L2 fault in an Ideal boiler

In this situation, your boiler has lost the necessary flame, resulting in the appearance of the error code. Even the Pointer Sisters can't bring back the fire this time.

Your heating system engineer should check the flame sensor to ensure it's functioning correctly. If not, the solution is to replace the old sensor with a new one.

Gas Valve Fault

The L2 fault code in your Ideal Logic boiler may be due to a disabled gas valve. The gas valve's duty is to control the gas flow for heating water; if it's faulty, the L2 alarm may occur.

The gas valve has moving parts that can become stuck over time, preventing gas from flowing correctly. This leads to the L2 fault code.

If your Ideal Logic boiler shows the L2 code, it could mean the gas valve is stuck in the open position, causing the flame to go out. A professional boiler repair company can help free the valve, but replacing it may be more cost-effective.

Consider replacing the entire gas valve if it's failing along with other parts.

Low Gas Pressure

If you have a large-capacity boiler, it's essential to check if your gas supply has been upgraded. Proper gas flow is crucial for your boiler to function correctly. If your boiler displays the L2 Ideal boiler error, it might be due to insufficient gas supply.

Consider upgrading to a larger diameter gas pipe to ensure proper gas delivery.

Additionally, check the gas pressure, as low pressure from your supplier could be the issue.

Frozen Condensate Pipe

In winter, condensate pipes in boilers can freeze, causing a blockage and leading to the L2 fault code. Usually, modern boilers turn vapours into the water for heating again.

The flue pipe cools down fast, making water every hour. Condensate pipes, usually made of plastic, remove waste from boilers and work with flue pipes that carry away exhaust gases. These pipes come out of boilers and connect to sewer pipes for house drainage. This is risky as harmful gases may escape. Certified gas engineers can thaw frozen pipes using warm water and reroute them for better flow.

Boiler lagging adds extra protection to prevent pipes from freezing.

Gas Meter Blockage

In winter, the gas meter, like the condensate pipe, can face issues, potentially causing the L2 fault code on your Ideal Logic boiler.

A professional boiler repair company will focus on the gas meter's regulator, ensuring it's protected by lagging or boxing it in. This extra care helps resolve the L2 boiler fault when the meter's regulator thaws out, clearing the issue on your Logic boiler.

Gas Supply Issue

To maintain a continuous gas supply to your boiler, it is crucial to regularly check your credit if you use pre-pay meters.

If your credit is low or you don't use pre-paid meters, gas may not reach your home. Check if there is a central gas supply issue by simply turning on other gas appliances in your home.

In case of emergencies, you can find the isolation valve near your gas meter, which serves as a helpful tool. However, it is important to ensure timely payment of your gas bills, and if you use pre-pay meters, make sure to top them up as needed.

If you have any concerns about billing, feel free to contact your supplier for assistance. Lastly, activate the gas supply by turning the ignition valve lever.

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How to Fix an L2 Fault Code

We strictly advise you to consult a qualified heating engineer for safety and to ensure the issue is resolved correctly.
Thawing the Frozen Condensate Pipe With Hot Water

To fix a frozen condensate pipe, first, find where it is outside. Then, use warm water to thaw the pipe and clear the blockage. It's important to avoid using boiling water as it can damage the pipe; stick to warm water for a safe solution.

It's best to contact a professional heating engineer for further assistance. They will have the necessary tools and knowledge to diagnose and fix any underlying problems with your Ideal boiler.

Clean the Faulty Flame Sensor boiler-flame-sensor-in-new-condition

A gas engineer will check the sensor to see if there's any corrosion or issues that might have made it not work well. If the electrode is dirty or covered in soot, the engineer gently cleans the flame-sensing electrode with a soft brush or cloth.

Do not use harsh chemicals on your boiler. It could damage the boiler component. However, buying a new sensor might cost up to £300.

Replace the Flame Sensors

If the boiler's ignition process doesn't work, it might be due to a problem with the spark generator, leading to an L2 fault code.

boiler ignition electrode in new condtion

The electrodes and ignition leads, responsible for creating the spark that starts the flame, can wear out over time, especially if there's moisture buildup.

Replace the Pipes

It is crucial to seek assistance from a Gas Safe registered engineer with the necessary expertise. It is not advisable to attempt any adjustments yourself. A professional engineer will conduct a thorough inspection of the pressure at both the boiler and gas meters.

Ongoing boiler pump replacement by a serviceteam engineer

Ongoing boiler pump replacement in London.

To avoid lagging
In the event of a frozen regulator, they can effectively insulate the affected area, commonly called "lagging." If your Ideal boiler generates a gas volume exceeding the capacity of your mains supply, it may be necessary to replace the pipes with larger ones, which could impact the overall cost of the pipe replacement.

Rest assured that relying on a professional engineer will ensure a safe and optimal solution to your gas pressure concerns.

Give To unblock the flue
If your boiler is showing an L2 fault code, it's worth checking the flue for any blockages that could be preventing proper ventilation. A professional engineer will clear out any debris or obstructions to allow the boiler to function correctly.

Is The L2 Fault On Ideal Boiler a Sign That You Need a New Boiler?

The simple answer is NO.
Usually, there's no need to replace the boiler just for an L2 fault code.

“However, if the gas valve is damaged or fails, getting a new combi boiler might be a wise and long-term choice.”
a new Ideal combi boiler

a new Ideal plus combi boiler

First, you will need to explore the options for the best combi boiler before making a decision. As boilers age, they become less efficient, so consider installing a new boiler for a fixed-price quote with serviceteam.

We've also covered the F1 boiler fault with Ideal boilers, so you can learn more about Ideal boiler error codes and make sure your heating works well.

Need to Know More About Serviceteam?

Serviceteam is a professional gas safe registered company in London endorsed by a WHICH? Trusted trader.

For boiler repairs:

  • Our prices start from £104 + VAT
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Old boilers are more prone to trouble. And become less efficient over time. When you are considering getting a new boiler for a fixed price, contact the serviceteam for a professional and hassle-free heating experience.

If you want to book your engineer now, Click on the box.
Happy heating!


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