Ideal Logic L2 Fault Code Error, Its Causes and How to Fix


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Emergency Heating Engineer London

The boiler shows different fault codes to indicate problems. In the case of an ideal logic L2 fault code, the boiler has a problem with the ignition, which causes it to go out of flame. The L2 fault has many reasons; regardless of the cause, your boiler won’t operate until the issue is fixed.

This article discusses the L2 fault code, its causes, and how to fix them.

What is L2 Fault Code?

The L2 fault code error means that your boiler has ignition problems. It is a severe problem that requires a quick fix and causes the boiler to go out of flame. In this error, the boiler loses its flames, will lockout, and will only work once the problem is fixed.

Causes of L2 Fault Code Error

Many potential reasons can cause ideal logic L2 fault code, some of the most common are discussed below:

  • Faulty Ignition Lead
  • Problematic Gas Valve
  • Low Gas Pressure
  • Blocked Condensate Pipe
  • Faulty Flame Sensor
  • Gas Meter Blockage
  • No Power to the Boiler
  • Faulty Spark Generator

Faulty Ignition Lead

Ignition lead is an essential part of the boilers, needed for burning gas to produce flames. Any fault to it can result in flame loss, causing an ideal logic L2 fault code.

When the boiler is turned on, the gas is released into the combustion chamber, and the ignition lead sparks a flame. If it doesn’t happen, then the boiler will immediately show the L2 fault code error.

Problematic Gas Valve

Disabled gas valves can also be the reason behind the L2 fault code. This valve is responsible for gas flow into your boiler; whenever you open the hot water tap, the valve turns on and vice versa.

The gas valve can be stuck over time, consisting of moving parts. Whenever your boiler faces an L2 fault code, there are chances that the gas valve can be stuck in a half-closed position. Therefore, it’s unable to fulfil the gas demand of the boiler, resulting in a flame loss.

Low Gas Pressure

If you’ve bought a modern, large-capacity boiler, it will need an upgraded gas pipe for sufficient gas pressure. If your main gas pipe has not been updated according to the gas requirement of the modern boiler, the boiler will not get the gas it needs, causing an L2 fault code. If this is the case, you’ll have to reach out to your gas supplier to install the larger-diameter gas pipe.

Blocked Condensate Pipe

The condensate pipes are responsible for escaping harmful and condensed gases from your boiler. It is common for these pipes to freeze during the cold winter months. The frozen pipes don’t allow gases to move out, making your heating system dangerous and causing an L2 fault code.

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The problem of frozen pipes can be fixed by running warm water through them. Once you are done with this, it will enable the engineer to route the condensate pipe to the vertical position, allowing the gases to run quicker and decreasing the chances of freezing.

Faulty Flame Sensor

The flame sensor sends a signal to the Printed Circuit Board (PCB), which controls the boiler. If the flame sensor is faulty, the PCB will not get a signal about the flame, resulting in cutting off the supply of gas and triggering the ideal logic L2 fault code. To fix the problem, the engineer will need to replace the flame sensor.

Gas Meter Blockage

The gas meter is also prone to blockage in winter months, similar to condensate pipes, resulting in an L2 fault code. To prevent this error, the boiler repair company place the gas meter inside a box to protect it from harsh weather or elements.

No Power to the Boiler

The boiler needs electricity for its function; if there is a problem with the power outage, the electricity supply could be cut off. This leads to ignition problems and L2 fault code.

To fix the issue, check the fusebox switches and reset them to the top position to supply power to the appliances. Furthermore, check your thermostat’s temperature and reset it.

Faulty Spark Generator

If your boiler is not catching flame, it could also be caused by the faulty spark generator. The electrodes, which are responsible for igniting the flame, can become worn over time. This can be caused by dirt or moisture buildup in the heating system. 

To fix the issue, inspect the boiler thoroughly to source the leaks which cause moisture to enter and repair them. If the leaks are addressed on time, they will cause serious damage to the internal components of the heating system.

Frequently Asked Questions (FAQs)

If your boiler has an L2 fault code, it is improbable to get it replaced. Nonetheless, there are some cases where replacement might make sense. For instance, if your boiler’s components are deteriorating, the gas valve becomes faulty, and it gets out of warranty, replacing the boiler is more worthwhile than repairs.

Trying DIY techniques to fix the L2 fault code on your boiler is not recommended, as this error relates to the boiler's internal components. Since the boiler is a gas appliance, only Gas Safe registered people are allowed to work on such appliances.

Turn off your boiler right away and leave your house, then reach out to an emergency heating system engineer.

It is usually caused by the regulators on the gas meter. During winter, these regulators get frozen, restricting the gas flow to the boiler.

Last Words

The L2 fault on a boiler means it is out of flame and is caused by many reasons, including faulty ignition lead, problematic gas valve, low gas pressure, blocked condensate pipe, flame sensor failure, blocked gas meter, and faulty spark generator. You’ll need to fix the problems immediately to restart the boiler’s operation.

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