ideal boiler fault codes
James Elston

James Elston

Published February 8, 2024

Ideal boilers are known for their efficiency and reliability, but like any other appliance, they can sometimes encounter issues.

If you have an Ideal boiler, it is essential to understand what the fault codes and error messages mean so that you know what to do if you encounter one.

This guide will allow you to learn about common Ideal error codes, how to address them, preventative maintenance tips, and when it’s time to consider a boiler replacement.

Ideal Boiler Fault Codes – Overview

  • Ideal Boiler error codes help diagnose issues and prevent damage.
  • Regularly check the water pressure and radiator/boiler valves, and contact a Gas Safe Registered Engineer for complex faults or safety concerns.
  • Consider replacing an ageing boiler to achieve optimal efficiency & performance with potential energy savings. Upgrading to a new energy-efficient boiler will also save you money.

What do Ideal Boiler Error Codes Mean?

Now, there’s no need to panic if you see a fault code on your Ideal boiler since many issues can be solved by you. All you need is a little advice, and you should be able to get your boiler back up and running.

The most common error codes you tend to encounter are:

  • F1: indicating a low water pressure issue
  • F2: indicating a flame loss 
  • L2: indicating an ignition failure

These error codes can affect the boiler’s efficiency and ability to meet hot water demand. 

Let’s look at them in more detail.

Now, there’s no need to panic if you see a fault code on your Ideal boiler since many issues can be solved by you. All you need is a little advice, and you should be able to get your boiler back up and running.

The most common error codes you tend to encounter are:

  • F1: indicating a low water pressure issue
  • F2: indicating a flame loss 
  • L2: indicating an ignition failure

These error codes can affect the boiler’s efficiency and ability to meet hot water demand. 

Let’s look at them in more detail.

Ideal F1 Fault – Low Water Pressure

The F1 error code indicates low water pressure. When this happens, you can experience: 

  • A lack of hot water
  • Radiators failing to heat
  • The boiler ceasing to operate

Causes of low water pressure may include: 

  • Leaks in the system
  • Recently bled radiators
  • Faulty pressure relief valve
  • Expansion vessel issues
  • Natural pressure loss over time

How to fix the problem

First, check if your boiler has low pressure:

  1. Find the pressure gauge 
  2. Check if the needle is below 1 bar when the system is cold (normal pressure is between 1 – 2 bar)

If you have recently bled your radiators, this can cause a temporary pressure drop. Therefore, wait a while to see if the pressure readjusts itself to the correct level.

If you find that the pressure drop was not caused by bleeding your radiators, you can attempt to repressurise the system by topping up the boiler’s water level. To understand how to do this, refer to your boiler’s user manual.

If this does not solve the issue, consult a professional.

Ideal F2 Fault – Flame Loss Error

The F2 fault code in an Ideal Boiler means the flame has been extinguished. This can be due to:

  • A reduction in gas pressure
  • A blocked flue
  • A faulty flue sensor
  • A faulty gas valve

When this happens, the boiler will go into lockout mode and cannot be used until the issue has been fixed.

How to fix the problem

When faced with an F2 fault you must immediately call a gas technician if you hear any strange gurgling noise.

If you hear no strange noises, try resetting your boiler by switching it on and off again. You can also check that the yellow gas isolation valve is switched to the “On” position. If that doesn’t work, you must contact a qualified gas technician.

Any attempts to fix the boiler yourself could pose safety risks or inflict further damage. Self-fixing will also void your warranty if you have one.

Ideal L2 Error Code – Ignition Failure

The L2 error code in Ideal Boilers signifies ignition failure. Common causes include:

  • Problems with the flame detection system
  • A flame sensor malfunction 
  • Disabled gas valve

An L2 fault code will also cause your boiler to go into lockout mode until it’s fixed.

How to fix the problem

If there are gurgling noises, the L2 fault also requires a qualified gas technician to come and diagnose the cause of the fault and carry out the repair. 

If no noise, check the yellow gas isolation valve is on and try resetting the boiler. If the problem persists, call a technician.

This ensures that any issues with gas pressure or faulty gas valve problems are addressed safely and effectively by a professional.

All Ideal Boiler Error Codes

For easy reference, here is a complete list of all Ideal Boiler error codes and the following actions you can take to try and fix the problem

Always consult the specific user guide or documentation for your Ideal boiler model to give you a better understanding of what a fault code might mean when it shows on your boiler.

If none of the actions below are effective in solving the problem, then you need to call a heating engineer.

If your warranty is still active then you may find the cost of fixing the fault is covered. If not, you will have to pay for the fix yourself.

Here’s an idea of what costs to expect. Keep in mind that actual costs may vary depending on the location, boiler model, and complexity of the issue.

Ideal Boiler Error CodesProblemActionEstimated cost to fix by a qualified engineer
L1Temperature overheating or no water flowCheck radiator valves are open
Check water pressure
Reset boiler if pressure too low
£150 – £300
L2Flame ignition failureReset the boiler
Check yellow gas isolation valve is on
f you hear a gurgling noise call an engineer
£100 – £250
L3No water flowReset the boiler
Check yellow gas isolation valve is on
Turn boiler off and bleed radiators
Reset boiler
£150 – £300
L5Too many resets within 15 minutesTurn the boiler off and on again to reset£80 – £150
L6False flame lockoutTurn the boiler off and on again to reset£100 – £200
F1Low pressureCheck water pressure
Top up the boiler’s water level
£80 – £150
F2Flame loss/ignition lockoutReset the boiler
Check yellow gas isolation valve is on
If you hear a gurgling noise call an engineer
£100 – £250
F3Fan issueReset the boiler£200 – £400
F4Flow thermistor issueReset the boiler£120 – £220
F5Return thermistor issueReset the boiler£120 – £220
F6Outside sensor issueReset the boiler£80 – £180
F7Low mains voltage issueBoiler voltage may be too low
Contact an electrician to inspect your home’s electric system
£80 – £200
F0No water flow thermistor issueReset the boiler£120 – £220
C2BCC chip issueReset the boiler£150 – £400
C0BCC activation fault issueReset the boiler£150 – £300
Prices correct as of 05/09/2024

Complex Fault Codes and Safety Concerns

There are complex fault codes in Ideal Boilers that in most cases require professional intervention. 

If resetting the boiler does not work, these codes necessitate the expertise of a Gas Safe Registered Engineer. Not doing this puts you at serious risk of:

  • Carbon monoxide leaks
  • Gas leaks
  • Electrical faults
  • Health risks

In the face of such complex issues, relying on a professional is necessary to ensure your boiler’s safety and proper functioning.

Preventing Ideal Boiler Faults

Preventive maintenance can go a long way in avoiding issues with your Ideal Boiler. 

Two key areas to focus on are maintaining optimal water pressure and ensuring the proper functionality of the radiator and boiler valves. Closely monitoring these areas can aid in preventing boiler faults and ensuring efficient boiler operation.

It is also best practice to have your boiler professionally serviced regularly.

Keep Water Pressure Optimal

Keeping the water pressure in your Ideal Boiler at its optimum is necessary for its efficient operation. You should regularly check it to see if it is within the acceptable range:

  • Locate the pressure gauge on the boiler (typically found on the front panel or near the controls)
  • The pressure gauge should read between 1 and 2 bars
  • The optimal boiler pressure is 1.5 bars, often indicated as a range in green on the gauge.

Ensure Radiator and Boiler Valves Function Properly

To avoid faults in your Ideal Boiler, the radiator and boiler valves must function properly, ensuring optimal flow temperature. 

Signs of valve malfunction may include a radiator that is hot at the bottom but cold at the top or a broken valve that sticks or catches in an open or closed position.

To assess the functionality of your boiler valves:

  • Inspect the yellow emergency control valve to ensure it is open.
  • Maintain and examine gas valves regularly, and consider replacing the flow thermistor if needed.
  • Check the diverter valve if you are experiencing heating but no hot water in a combi boiler.

If you are uncertain about checking boiler valves, including isolation valves, it is recommended to seek professional assistance.

Ideal Boiler Replacement

If you experience persistent faults, it may be time to consider replacing your Ideal Boiler, especially if it is old.

As a reference, the typical lifespan of an Ideal boiler is estimated to be between 10 and 15 years.

As your boiler ages, its efficiency decreases, potentially leading to increased energy bills and the need for more frequent repairs. At this point, upgrading to a more efficient boiler will be the best solution.

Boilers over 25 years old can drop in efficiency by as much as 40%.

Indicators that your boiler may be nearing the end of its useful life include:

  • Leaks
  • Discolouration of flames
  • Increased need for maintenance
  • Frequent repairs
  • Unusual noises
  • Regular loss of pressure
  • Yellow pilot light flame

Get An Instant Quote For A New Boiler

If your existing boiler is on its last legs, it’s time for a replacement. Simply complete the quick online form to get a free boiler quote.

Our prices are affordable and our services are carried out by qualified and experienced professionals. Plus, we take care of everything from installation through to maintenance and ongoing aftercare.

FAQs

What are the common faults with ideal boilers?

Common faults with ideal boilers include ignition not working, leaks, pump failure, issues with the internal electrics and expansion vessel failure. All of these require professional help to fix, so please don’t attempt to solve them yourself.

How do I reset my Ideal boiler?

To reset an Ideal boiler, turn the mode control knob to the reset position and then back to the required setting. 

Push the reset button underneath the display or go into the menu settings on the display for newer models. If the boiler still fails to ignite, seek help from a Gas Safe Registered engineer.

What is a PCB on an Ideal boiler?

A printed circuit board (PCB) is an electrical hub for your boiler, ensuring everything is working as it should and working in sync.

If an issue occurs with the PCB, that means your Ideal boiler won’t be able to function effectively and needs to be addressed.

Final Thoughts

While the are a lot of Ideal boiler fault and error codes, it’s worth familiarising yourself with 

them. Doing so will allow you to quickly diagnose the issue and take the appropriate action.

Dealing swiftly with boiler problems is crucial for your safety and will also help prolong the life of your boiler.

Conducting regular maintenance, such as ensuring optimal water pressure and proper valve functionality, will also help prevent faults and keep your boiler running efficiently.

For complex issues or safety concerns, always consult a Gas Safe Registered Engineer to ensure the safe operation of your boiler.

James Elston

James Elston

Boiler Expert


James Elston is the top boiler replacement and heating expert at Eco Happy. He has over 20 years of experience in the industry, focusing on Gas Safe boiler installations and offering home-heating and energy-saving solutions to homeowners across the UK. From sourcing the most energy-efficient combi boiler to providing specialist heating advice, James ensures that Eco Happy maintains the highest standards and best customer service.

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