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Last updated: 17th May, 2024


Ideal Boiler L2 Fault Code - How to Fix

Ideal Boiler L2 Fault Code - How to Fix

Key takeaways

  • An Ideal L2 error code can be caused by several issues with your boiler, including: frozen condensate pipe, faulty components and insufficient gas supply.
  • Gas Safe qualified engineers should always be trusted to identify and remedy boiler issues.
  • In many cases, upgrading your old boiler to a new, robust one is the best strategy.

Facing an Ideal L2 boiler error code? iHeat, an online boiler installation company, explains its causes, steps to fix it, why a qualified engineer is critical for the task, and why upgrading to a new boiler could be beneficial.

In today's modern world, where homeowners have the opportunity to maintain comfort and convenience through a range of automated systems, boilers have become an essential aspect of that domestic ease. 

However, these useful devices come with their share of issues, and boiler error codes are one of them. 

Amongst many error codes, the Ideal L2 boiler error code seems to cause significant confusion among homeowners.

If you own an Ideal boiler and have stumbled upon the L2 error code, there's no need to worry. 

As an online boiler installation company, iHeat is dedicated to providing homeowners with useful information to tackle such boiler-related issues effectively.

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What is a Boiler Error Code?

Boiler error codes are specific alphanumeric indicators displayed on a boiler’s control panel to alert users about potential issues within the system.

These codes are part of the boiler's diagnostic system, designed to help identify the nature of the problem quickly, enabling more efficient troubleshooting and repairs.

Importance of Understanding Error Codes for Boiler Maintenance-

Understanding boiler error codes is crucial for maintaining the optimal operation of your heating system.

Recognising these codes helps homeowners and technicians diagnose issues early, potentially preventing minor issues from escalating into costly repairs. It also ensures the boiler operates safely and efficiently.

What Does the Ideal Boiler L2 Fault Code Mean?

The Ideal boiler L2 fault code indicates a flame loss in the boiler, meaning the system tried to ignite or re-ignite but failed.

This can happen for various reasons, including blocked burners, gas supply issues, faulty ignition leads, or problems with the flame detection electrode.

Possible Reasons Why This Error Code Appears-

  1. Gas Supply Issues: Interruptions or low pressure in the gas supply can prevent ignition.

  2. Faulty Ignition Components: Worn out or malfunctioning ignition leads or electrodes.

  3. Flue or Air Supply Blockages: Obstructions in the flue or air inlet can affect combustion.

  4. Control Board Problems: Electrical faults that disrupt the ignition sequence.

Signs of the Ideal Boiler L2 Fault Code-

Common signs include:

  • The boiler failing to fire up and provide heat.

  • Frequent resets and lockouts.

  • Hearing the ignition attempts without the boiler lighting.

Can I Fix This Boiler Error Code Myself?

Some checks and fixes can be performed DIY, such as ensuring there are no obstructions in the flue and that the gas supply is working correctly.

Resetting the boiler using the manufacturer's instructions might also resolve the issue temporarily.

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

If basic troubleshooting does not resolve the L2 fault code, or if you’re unsure about any procedures, it's advisable to call a professional. Working with gas appliances without proper training can be dangerous.

Do I Need to Contact a Gas Safe Engineer to Fix This Error Code?

Yes, contacting a Gas Safe registered engineer is necessary for resolving the L2 fault code. These professionals are certified to safely repair gas boilers and will ensure the work meets safety and efficiency standards.

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

A Gas Safe engineer is a technician who is registered and certified to work safely and legally on gas appliances in the UK. Their expertise is crucial for ensuring all repairs and installations comply with national safety regulations.

How Much Does Fixing the Ideal Boiler L2 Fault Code Cost?

Repairing an L2 fault code typically costs between £150 and £300, depending on the underlying issue. Factors affecting the cost include the complexity of the fault, parts required, and the engineer’s call-out charge.

Factors That Might Affect the Cost-

  1. Severity of the Issue: More complex problems require more time and expensive parts.

  2. Location: Rates can vary significantly across different regions.

  3. Urgency: Emergency call-outs may incur higher charges.

Understanding and addressing boiler error codes promptly can help maintain your boiler’s efficiency and safety, potentially saving you from more significant expenses down the line.

Do I Need a New Boiler?

Deciding whether to repair your existing boiler or invest in a new one involves several factors. Here’s how to determine the best course of action.

Criteria to Decide Whether a Repair is Sufficient or if a New Boiler is Required

  1. Age of the Boiler: If your boiler is close to or has surpassed its typical lifespan (usually around 15-20 years), it might be more economical in the long run to replace it rather than continuing to pay for frequent repairs.

  2. Frequency of Breakdowns: Frequent malfunctions are a sign that your boiler is becoming less reliable. Regular breakdowns not only increase the cost over time but also indicate that the system might be nearing the end of its useful life.

  3. Cost of Repairs: Compare the cost of repairs to the price of a new boiler. If the repair costs are approaching 50% of the cost of a new boiler, it’s generally more cost-effective to replace it.

  4. Energy Efficiency: Older boilers often operate at lower efficiency levels. A new, high-efficiency boiler could significantly reduce your heating bills, making it a worthwhile investment.

  5. Safety: If there are any safety concerns with your current boiler, such as risks of carbon monoxide leaks, replace it immediately.

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

Boilers typically have a lifespan of about 15-20 years, though this can vary based on the model, maintenance, and usage patterns.

Regular servicing can extend a boiler’s life, but as it ages, it may become less efficient and more prone to breakdowns. Replacement is generally recommended when:

  • The boiler is beyond repair.

  • It no longer meets your heating needs.

  • You’re facing expensive repairs.

  • There are consistent issues with boiler safety.

  • You want to upgrade to a more energy-efficient model.


Frozen Condensate Pipe

The condensate pipe, responsible for carrying waste condensation from the boiler to an outside drain, can freeze during cold weather.

This blockage can cause the boiler's ignition process to fail, resulting in the L2 error code.


Faulty Ignition Leads or Electrodes

Ignition leads and electrodes play a pivotal role in firing up the boiler. If they're faulty or have worn out over time, the boiler might fail to ignite, leading to the L2 error.

Insufficient Gas Supply

A boiler requires an adequate gas supply to ignite properly. If there's a gas supply issue or if the gas flow to the boiler is inadequate, it can lead to the boiler failing to ignite, causing an L2 error code.


Thaw the Frozen Condensate Pipe

You can attempt to thaw the frozen condensate pipe. Using a hot water bottle, a heat wrap, or a warm cloth, you can gradually melt the ice within the pipe. 

However, remember to be cautious during this process. If you're unsure or uncomfortable, it's best to call a professional.

If these steps fail to resolve the issue, it's wise to contact an engineer who can safely and efficiently diagnose and fix the problem.

Boiler Types


Combis or combination boilers, combine all components and aspects of a heating system (central heating and hot water production) into one succinct and powerful unit.

Their economic size, quick flow rates and dual functionality means combis are extremely efficient and effective when heating a multitude of property sizes, being best suited for small to medium sized homes with 1-2 bathrooms.


System boilers perform best in homes with a high hot water demand, specifically either larger properties with a higher number of residents or properties with two or more bathrooms. 

System boilers store hot water in a separate cylinder which provides constant flow access but requires additional (minimal) storage space.

System boilers can service multiple flow outlets at one time, meaning no one in a larger home would be standing around waiting for a shower.

Heat Only

A heat only boiler provides the heat for a home's central heating system and hot water cylinder. A heat only boiler is suited to servicing larger properties with multiple bathrooms/radiators or a business premises with a high water demand. 

Heat only boilers do require sufficient installation space within a property, as they use two storage tanks (feed & expansion) as well as the aforementioned hot water cylinder. 

Although a combi is generally considered more space saving, a modern heat only boiler is still compact and can supply more bathrooms with hot running water than a combi can.

iHeat Boiler Servicing-

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 Costs-

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 want to remove all of this undue stress and make the decision making process of upgrading to a new central heating system, as easy as possible.

Boiler costs can vary depending on a number of factors including their brand, model, fuel, output, warranty, labour and 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


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System to combi conversion


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New boiler install


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Back boiler to a combi


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System to system


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Coming across an error code like the Ideal L2 on your boiler can be quite daunting, but having a basic understanding of the problem can ease this discomfort. 

While it's always recommended to call in a qualified engineer to handle any boiler issues, being informed about the error can make the whole process less intimidating.

In some cases, the appearance of the L2 error code, especially if it's a recurrent issue, may signal that it's time for a boiler upgrade.

At iHeat, we're here to assist you throughout this process, providing a seamless online boiler installation service and a selection of modern, energy-efficient boilers to choose from. While a new boiler is a significant investment, the benefits it offers, from energy efficiency to reliability and long-term savings, make it a wise choice for the modern homeowner.

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Frequently Asked Questions

How Do I Fix L2 Error on Ideal Boiler?

The L2 error code on an Ideal boiler indicates a flame loss, meaning the boiler attempted to ignite but could not sustain a flame. To troubleshoot:

  • Reset the Boiler: Often, a simple reset can clear the error. Turn the boiler off and then on again, or use the reset button if your model has one.
  • Check Gas Supply: Ensure your home's gas supply is on and functioning. If other gas appliances are also not working, there may be a broader issue.
  • Inspect the Flue and Air Intakes: Blockages can prevent the boiler from igniting properly. Ensure these are clear.
  • Professional Help: If these steps don't resolve the issue, it's best to call a qualified heating engineer. The problem could be due to a faulty ignition, gas valve, or another component that requires professional diagnosis and repair.

What is the Code L2 Fault?

The L2 fault code specifically points to a flame loss in your boiler. This can happen for various reasons, including issues with the gas supply, flue blockages, or component failures. It's a common code across several boiler brands, including Ideal, indicating the boiler detected a flame but then lost it unexpectedly.

How Do You Fix a Flame Loss on an Ideal Boiler?

Fixing a flame loss involves several steps, including resetting the boiler, checking the gas supply, ensuring there are no blockages in the flue or air intakes, and inspecting the ignition leads and electrodes. If simple troubleshooting doesn't work, the issue may be more complex, such as a faulty gas valve or control board, requiring professional repair.

Can I Fix an L2 Boiler Fault Myself?

While you can attempt basic troubleshooting, such as resetting the boiler or checking the gas supply, many causes of an L2 fault require technical knowledge and tools for safe repair. If simple resets don't clear the fault, it's advisable to contact a professional heating engineer to avoid risking further damage or safety issues.

How Do You Reignite an Ideal Boiler?

To reignite an Ideal boiler, you can typically use the reset button or switch the boiler off and then back on. This process can clear temporary faults and attempt a new ignition cycle. If the boiler doesn't reignite or consistently displays a fault code, further investigation by a professional may be necessary.

Where is the Restart Button on Ideal Boiler?

The restart or reset button on an Ideal boiler is usually located on the boiler's control panel. The exact position can vary by model, but it is often clearly labeled and accessible without needing to open the boiler casing. Consult your boiler's manual for specific instructions on locating and using the reset feature for your particular model.

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.