Ideal Boiler Fault Codes

ideal boiler fault codes

Ideal Boiler Fault Codes

Ideal Boilers is a UK-based company providing innovative and high-quality heating solutions for over 100 years. The company is committed to providing reliable and efficient heating systems that are designed to meet the specific needs of homeowners and businesses.

Ideal Boilers has a wide range of products, from combi boilers to system boilers designed to suit different heating requirements. The company’s products are known for their high efficiency, easy installation, and low maintenance, making them a popular choice for residential and commercial customers.

Ideal Boilers is also committed to sustainability and reducing carbon emissions. The company has introduced a range of energy-efficient boilers designed to reduce energy consumption and carbon emissions, helping to create a more sustainable future.

Need help with your Ideal Boiler?

With a focus on innovation, reliability, and efficiency, Ideal Boilers has become one of the leading brands in the heating industry. In addition, the company has a reputation for providing exceptional customer service and support, ensuring that customers receive the best possible experience when choosing and using their products.
Overall, Ideal Boilers is a trusted and reputable brand with a long-standing history of providing reliable and efficient heating solutions.
Croston Plumbing & Heating is here to assist. We are the number one choice for plumbing services & gas-related work. Give us a call at 01257452879.
We have have a wealth of expertise in installing, servicing and repairing Ideal boilers. Locally, we are known to be your go-to company for helping customer fix Ideal boiler fault codes and issues.

Ideal Boiler Fault Codes

FD: Lack of water flow

Due to installation errors, this problem may originate from air locks in your system, a faulty pump or wiring. It could also be due to insufficient water in your central heating system or poor water circulation. The resolution The issue is not with your boiler but with its installation. You may fix the problem by repressurising your boiler, but if it persists, it is best to contact your installer to inspect your heating system and rectify the issue.

F1: Insufficient water pressure

The problem If your heating system does not have enough water, this fault may occur due to low pressure. Using the built-in filling loop, you can fix this problem by topping up your boiler's water pressure to 1.5. If you still face issues, contact a Gas Safe registered engineer.

F2: Flame outage

The problem This usually indicates a flame loss during operation, which may be due to various system errors such as incorrect gas pressure, a faulty gas valve, an issue with your flue, incorrect valve adjustment, or a fan malfunction. The solution Firstly, check other gas appliances and try resetting your boiler. This fault typically occurs in older and low-efficiency boilers, so consider installing a new boiler.

F3: Fan malfunction

The problem This fault is caused by a damaged or loose fan, which could be related to deeper issues such as damaged connections, water damage from a boiler leak, a fault with the air pressure switch, or a problem with the printed circuit board. The solution This fault requires the help of a qualified engineer as it can stem from various causes, and costs can vary.

F4: Flow thermistor malfunction

The problem The F4 fault code often indicates a problem with your boiler's flow thermistor or its operation, typically related to circulation issues. The solution This fault requires a call-out to a Gas Safe registered engineer.

F5: Return thermistor malfunction

The problem This fault refers to a problem with the return thermistor or its operation, often related to a faulty NTC return thermistor, a damaged connection, a temperature differential that is too high between the flow/return thermistors, or a faulty printed circuit board. The solution This fault requires a call-out to a Gas Safe registered engineer.

F6: Outside sensor malfunction

The problem This fault code usually indicates a broken or faulty outside sensor, which could also be related to your boiler's printed circuit board, typically a more expensive fix. The solution If you recently had a weather compensator fitted, the fault may be related to its installation. If you still need one, call a qualified engineer.

F7: Low mains voltage

The problem If you see this fault code, there may be an issue with your property's mains electricity source. For safety, your boiler stops functioning once it detects this fault. The solution The voltage to the boiler has dropped below 190 vol. This is not a boiler fault, but it is best to contact your installer.

F9: Printed circuit board (PCB) malfunction

The problem The F9 fault code on your Ideal boiler usually relates to an unconfigured printed circuit board (PCB). Repairing this fault may be costly, so installing a new boiler is worth it.

L1: Insufficient water flow

The issue: Your boiler takes resistance readings sent to the printed circuit board. If the temperature reading is too high or low, the boiler will stop working as a safety precaution and display a fault code. The solution Try resetting your boiler. If something else is needed, contact a qualified engineer. Overheating is often a problem with older, less efficient boilers, so investing in a new heating system may be worth investing in.

L2: Ignition lockout

The problem Your boiler has 'locked out' as a safety precaution, and the cause needs to be identified. The solution is to Reset your boiler. If you hear rumbling from the system, it indicates a blocked condensate pipe or an issue with your flue, requiring a qualified engineer's call-out.

L3: Flow thermistor malfunction

The problem This fault code typically indicates that someone changed the printed circuit board (PCB) and used the wrong boiler chip card (BCC). The solution This requires a call-out from a qualified engineer.

L9/H9/HA/LA: Overheating

The problem Like L1, this code may indicate that the temperature on your resistance reading is too high. The solution Check your system's pressure reading and bleed your radiators. If the issue persists, we recommend contacting a Gas Safe registered engineer, as the overheating may be due to a deeper problem with your boiler's pump or dry fire stat. .

LF: Ignition fault

The problem Your boiler may have 'locked out' as a safety precaution, and the cause needs to be addressed. Check that other gas appliances in your home are working, and then reset your boiler. If your boiler rumbles, there may be a blockage in your condensate pipe. Contact a qualified engineer to resolve the issue.

L5: Return pipe problem

The problem could happen if someone reset the boiler five times in 15 minutes. The solution Turn off the boiler's power at the fuse spur and then turn it back on. If the issue persists, contact a qualified engineer.

L6: Flame detection malfunction

The problem usually occurs when your flame ignites before your gas. The solution is to Reset your boiler. If the boiler fails to operate and is still covered by your warranty, contact your manufacturer for assistance.

C2: Boiler chip card malfunction

The issue The boiler chip card has an internal error or an activation fault. The resolution Try resetting your boiler. If this does not help, contact a Gas Safe registered engineer.

C0: Central heating signal problem

The issue If your domestic hot water is still functioning, your boiler could be going into pump overrun due to poor heating circulation. Alternatively, your thermostat's signal may be cutting in and out. To rectify this issue, we recommend seeking the help of a qualified engineer to check your room thermostat and radiator circulation.

No display

The issue There is a problem with your printed circuit board. The resolution Turn off the power at the fuse spur and turn it back on. If this does not work, contact our repairs team for assistance. If you have recently had electrical work done on the system, get your installer first.

Noisy operation

Issues such as kettling are common with central heating systems. A humming or rattling noise may indicate loose components or high pressure. To solve this issue, check the system for loose components or try repressurising your boiler. If these measures do not work, contact our repairs team.

Noisy ignition

The issue This may indicate a problem with your system's condensate pipe, gas, or flue. The resolution We recommend seeking the help of a Gas Safe registered engineer.

No/poor hot water

The issue If your heating is functioning, but your hot water is not being delivered as usual, it is typically not a boiler fault. The resolution We recommend seeking the help of a Gas Safe registered engineer. No/poor central heating The issue If your DHW is okay, this is typically not a boiler fault but a problem with your radiators. If there is no central heating issue, contact our repairs team. This fault could be expensive, and installing a new boiler could prove effective.

High gas bill

The issue This could be due to the efficiency rating of your boiler, and your energy bill may also be impacted by how you use your heating. The resolution Check your boiler's efficiency label. Investing in a new A-rated heating system could be beneficial.

Pressure loss

The issue This usually means that water is escaping somewhere in the system, or the problem could be due to the expansion valve failing and causing damage to the pressure release valve. The resolution First, follow our guide on how to repressurise your boiler. If this becomes an ongoing issue, check for leaks. If none are found, get in touch with our repairs team.

Are you interested in replacing your boiler and avoiding recurrent Ideal Boiler Fault Codes and problems?

Croston Plumbing & Heating specialist is here to assist. If there is a problem, one of our highly skilled repair technicians will be on hand to figure it out quickly and efficiently.
Whether or not you need a new boiler, our experts can help you with this decision. Get in touch with us today by calling 01257452879 or browse our site for additional information.

Here are some of the signs that you boiler needs replacing:


A sure sign that your boiler is due to be replaced is the kettling, gurgling and banging sounds that you might be hearing from your boiler when you run the hot water tap or turn on the central heating

Strange smells

While carbon monoxide does tend to be odourless, some gas companies do add a scent to help it become easier for you to detect if a leak has occurred. An eggy, sulphur-like smell around your boiler is a sure sign that there is a carbon monoxide leak and you should open all the windows and get out of the house as quickly as possible. Contact the Gas Emergency Services as soon as you can.

Yellow flame

A healthy boiler that’s working well should burn with a blue flame. However, if you’ve noticed a yellow flame on your boiler, this could be a sign of a serious issue such as a carbon monoxide problem. This gas is colourless and odourless and often, a yellow flame is the first sign that there’s a problem so it’s important to keep your eye out for it. If exposure levels are high enough, carbon monoxide can lead to serious illness or even be fatal.

ideal fault codes

Increase in energy bills

A boiler that is getting old and is increasingly less and less efficient can cost more money than most people can afford to spare. And, upgrading to a boiler that includes modern smart controls will not only improve efficiency but also give you a greater control over your energy usage and spending.

Frequent breakdown

Are you noticing that your boiler is break downing regularly or you are topping up your water pressure every week?

Reduced efficiency

When it comes to energy efficiency, some boilers are just missing the mark due to age. A boiler that’s rated ‘A’ in terms of efficiency will have an energy efficiency level of at least 90%. On the other hand, a boiler that’s rated ‘G’ will have an efficiency level of around 70%, meaning that for every £1 you spend on your energy bill, you’re losing 30p in wasted energy.

Expensive & difficult to find parts

If you’re having increasing problems with your boiler and you have been told by your boiler engineer that new parts are hard to find, it’s a clear sign that your boiler will probably need to be replaced soon. The older a boiler gets, the less likely it is that parts will be readily available. And if you’re struggling to find an engineer who is experienced with the type of boiler that you have, that’s even more reason to consider replacing it.

Do you Need Boiler Finance?

We know that if your boiler cannot be repaired and a new energy efficient boiler is required, then funds may not be available to cover the replacement. Here at Croston Plumbing & Heating, we offer a range of finance options to help cover the cost of the new boiler and installation.

What areas do we cover?

We offer our range of plumbing and heating services to customers in across the North-West. It is our aim to offer all our customers an exceptional service from start to finish. Our customers at Croston Plumbing & Heating are paramount to us and this will never change.