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Last updated: 1st December, 2023


Ideal F7 Error Code - How To Fix

Ideal F7 Error Code - How To Fix

Key takeaways

  • The Ideal F7 error code is commonly related to low mains voltage or electrical issues.
  • Diagnosing the cause of the F7 error is crucial for applying an effective remedy.
  • Calling a qualified gas engineer may be necessary if the problem is complex, or for safety reasons.

Understanding the Ideal F7 error code is vital for diagnosing the issue and applying the appropriate remedy. It is typically caused by low mains voltage, which means the boiler is not receiving sufficient electrical supply.

Ideal boilers are known for their efficiency and reliability, but occasionally, homeowners may encounter issues such as the F7 error code. This error is often related to electrical problems or faulty components within the boiler. In this article, we will explore the possible causes of the Ideal F7 error code and provide guidance on how to fix it.

Understanding the Ideal F7 error code is vital for diagnosing the issue and applying the appropriate remedy. It is typically caused by low mains voltage, which means the boiler is not receiving sufficient electrical supply. 

This can be due to a variety of reasons, including faulty wiring, a damaged circuit breaker, or an issue with the electricity supply in your home. It is essential to identify the root cause of the problem to avoid further damage or potential risks, such as electrical fires or damage to other appliances.

There are several steps you can take to resolve the Ideal F7 error code, from checking the electrical supply and wiring to resetting the boiler. However, it is crucial to exercise caution and seek professional assistance if you are unsure about how to proceed. In some cases, the issue may be more complex, and a qualified gas engineer might be required to address the problem effectively.

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Understanding the Ideal F7 Error Code

The Ideal F7 error code is a common issue encountered in Ideal boilers. This specific fault code indicates a problem related to flame loss during operation. To properly understand and address this fault code, it is essential to comprehend the various components involved and the potential reasons behind the issue.

One possible cause of the F7 error code is a malfunctioning air pressure switch. This component is responsible for detecting the right amount of air pressure within the boiler system. If the air pressure switch fails to perform its function, the boiler's safety mechanism may detect a potentially dangerous situation, resulting in the F7 error code. Hence, it is crucial to ensure the air pressure switch is functioning correctly.

Another possible reason behind the F7 fault code is a problem with the gas valve. The gas valve plays a crucial role in controlling the flow of gas into the combustion chamber. If the gas valve is not working correctly, it could lead to an inadequate amount of gas reaching the burner, thus causing flame loss and triggering the F7 error code. In such a scenario, it is essential to inspect the gas valve for any faults or damages.

To summarise, the Ideal F7 error code is primarily caused by issues concerning flame loss during the boiler's operation. 

By understanding the role of the air pressure switch and the gas valve within the system, one can efficiently diagnose and troubleshoot the error code. Users are encouraged to seek professional assistance to resolve this fault code, as dealing with boilers can potentially be hazardous if inexperienced.

Identifying Common Causes for the F7 Error Code

The F7 error code on Ideal boilers often indicates a fan fault or wiring issue. To properly diagnose and fix the problem, it is crucial to understand the common causes behind this error code. Highlighted below are some of the most frequent issues that lead to the F7 error code.

1. Fault with the fan or its wiring: The primary function of the fan is to ensure the safe removal of combustion gases from the boiler. A faulty fan can cause the F7 error to appear. Additionally, wiring issues related to the fan might also trigger this error code.

2. Low water pressure: Insufficient water pressure within the central heating system can result in the F7 error. This is often due to water leaks in the system or an issue with the pressure relief valve.

3. Gas supply issues: If the boiler is unable to detect a steady flow of gas, the F7 error code may be displayed. This could be caused by problems with the gas metre, gas appliances, or the gas supply line itself.

4. No water flow or low water flow: The F7 error code might appear when there's a lack of water flow in the system. This can be due to a blocked pipe, a faulty pump, or an issue with the diverter valve.

5. Low mains voltage: A sudden drop in mains voltage can lead to the F7 error code. Electrical issues, such as fluctuating power supply, can affect the boiler's operation and trigger the error.

6. Pump malfunction: A properly functioning pump is essential for circulating hot water through the system. A faulty pump can lead to inefficiencies and, ultimately, the F7 error code.

7. Thermistor fault: A thermistor monitors the temperature of the water within the boiler. Should this component fail or become faulty, the F7 error code may be displayed.

8. Printed circuit board (PCB) fault: The PCB is the 'brain' of the boiler, controlling and managing all of its functions. A fault in this circuit board can cause several error codes, including the F7 error.

9. Wiring issue: Any loose connections or damaged wiring within the boiler can trigger the F7 error code, as this may interfere with the proper functioning of the system.

In summary, numerous factors can contribute to the F7 error code. It is essential to identify the root cause before attempting to fix the issue. Most of these problems require the expertise of a Gas Safe registered engineer, so it is advised to seek professional assistance to ensure the safe operation of the boiler.

When to call a Gas Engineer

Ideal boiler F7 error code is often associated with problems in the mains electricity supply or faulty wiring within the property. While some minor issues can be fixed by the homeowner, certain situations require the expertise of a Gas Safe registered engineer. This section will guide you on when to call a gas engineer to resolve the F7 error code.

Power Supply Issues: If you suspect that the problem lies with the electricity supply from your utility provider, it's essential to contact them immediately. They will be able to investigate and rectify any issues with your electricity supply. Should the problem persist, consult a gas engineer.

Faulty Wiring: Damaged or faulty wiring within your property could be causing the F7 error code. This issue not only affects the boiler's performance but also poses a risk as a potential fire hazard. In such cases, it's important that a gas engineer is called to inspect and fix the faulty wiring.

Repeated Fault Codes: When the F7 error code keeps appearing even after resetting the boiler, it indicates that there might be a deeper issue at hand. A qualified gas engineer should be contacted to diagnose and resolve the problem.

Inaccessible Components: Some boiler components, such as the fan, may be difficult to access or handle safely. Do not attempt to fix these components on your own, as it might lead to further complications or damage. Instead, rely on a Gas Safe registered engineer to assess the situation and perform the necessary repairs.

In conclusion, while some Ideal boiler issues might be resolved with basic troubleshooting, it's crucial to call a gas engineer when dealing with the F7 fault code, particularly when it involves power supply, faulty wiring or inaccessible components. A Gas Safe registered engineer is trained and qualified to handle such issues, ensuring your boiler is functioning safely and efficiently.

Steps to Reset an Ideal Boiler

When encountering an F7 error code on your Ideal boiler, resetting the boiler can often be an effective solution. Follow these simple steps to properly reset your Ideal boiler and possibly resolve the issue:

  1. Locate the reset button: The reset button is typically found underneath the display or within the settings menu. Consult your boiler's user manual to pinpoint the exact location for your specific model.

  2. Turn off the boiler: Before proceeding with the reset, ensure that your Ideal boiler is in standby mode. This can be achieved by turning the boiler off for a brief period.

  3. Press and hold the reset button: Once you have located the reset button, press and hold it for a minimum of five seconds. After releasing the button, wait for the boiler to restart.

  4. Observe the boiler's behaviour: After the reset, monitor your boiler's performance. Check if the F7 error code has been resolved and if the radiators are heating up as expected.

  5. Avoid frequent restarts: It's important not to attempt more than five restarts within a 15-minute period. Doing so may lead to an LC error code, requiring further troubleshooting.

If the steps above don't clear the F7 error code, or the issue persists, it's crucial to contact a Gas Safe Registered Engineer for a comprehensive assessment and professional assistance. A Gas Safe engineer is qualified to handle boiler repairs and ensure your boiler is functioning safely and efficiently.

Remember to perform regular maintenance and annual servicing of your Ideal boiler by a Gas Safe registered engineer. This will help in avoiding potential issues, like the F7 error code, and prolong the lifespan of your boiler.

Addressing Water Pressure and Flow Issues

When dealing with an Ideal boiler displaying the F7 error code, it's essential to look at possible water pressure and flow issues. Low water pressure and no water flow are common concerns in these situations.

Low Water Pressure: If the problem is low water pressure, it's necessary to check the boiler pressure and refill if needed. The ideal pressure should be around 1.5 bars. To remedy the situation, you can use the built-in filling loop to repressurise the boiler.

No Water Flow: In the case of no water flow or "D" no water flow, the issue might arise due to an installation fault related to air locks, pump or wiring. Make sure you follow the proper guidelines to repressurise the boiler. If repressurising doesn't solve the problem, it is recommended to contact the installer for professional assistance.

One potential cause of water flow issues is a flow/return differential. This occurs when the difference between the flow and return temperatures is too high. If the differential is more than 35°C, it can result in an F7 error code.

In addition to the above issues, thermistor faults can also trigger the F7 error code.

  • Flow Thermistor Fault: The flow thermistor, which measures the flow temperature, might be defective. In this case, you will need to replace the 4 flow thermistor.

  • Return Thermistor Fault: Similarly, the return thermistor determines the return temperature. A fault in the 5 return thermistor would require replacement to remedy the issue.

In summary, addressing water pressure and flow issues can help resolve the F7 error code in an Ideal boiler. Regularly monitoring the boiler pressure and ensuring the proper functioning of thermistors can significantly enhance the boiler's performance and reliability. Always consult a professional if you're unsure about any of the steps mentioned above.

Dealing with Ignition and Flame Problems

Ideal boiler systems may sometimes experience common ignition and flame problems, including ignition lockout, failing to ignite, flame loss, and false flame lockout. This section aims to provide insights on how to address these issues efficiently and safely.

Ignition Lockout: An ignition lockout occurs when your boiler's ignition system fails to start or ignite the gas burner. To resolve this, first, check if the electrical connections are secure. If the issue persists, inspect the ignition electrode and lead to ensure they are clean and functioning properly. Professional assistance might be required if the problem still exists.

Failing to Ignite: If your Ideal boiler is failing to ignite, it can lead to an error code F7. The spark electrode and lead, boiler ignition, and gas valve should be assessed for any damage or malfunction. A qualified engineer's help may be necessary to rectify this situation.

When dealing with Flame Loss problems, it is crucial to ascertain the root cause. Some possible reasons include insufficient gas pressure, a faulty gas valve, or a malfunctioning flame detection system. You can inspect the boiler's gas pressure and flame detection components to identify any visible issues. If unable to diagnose the problem, consult a professional.

For issues related to a False Flame Lockout, ensure that the flame detection probes are clean and have the right calibration. Additionally, examine the wiring connections and the system’s printed circuit board (PCB) for any signs of damage. A gas engineer can provide expert guidance in resolving this issue.

In the case of an L6 False Flame Lockout, your Ideal boiler might have detected a flame even when the gas valve is closed. The flame detection system should be inspected, and any wiring or connection issues should be addressed. If these steps do not resolve the problem, contacting a trained engineer for further assistance is advised.

By being familiar with these common ignition and flame problems, one can efficiently identify and work towards resolving them in their Ideal boiler system. Moreover, regular maintenance and professional inspections will ensure that your boiler is running smoothly and safely.

Considerations for Replacing Parts or the Whole Boiler

When faced with an Ideal F7 error code, it's essential to weigh the options for repairing faulty components or opting for a complete boiler replacement. Understanding the potential causes of the F7 fault, such as issues with the gas mains electric voltage, wiring, or connections, can help make a well-informed decision.

New vs Older Boilers

For older boilers, numerous factors may influence the decision to replace parts or the entire boiler. When a boiler has surpassed its life expectancy, components like the printed circuit board (PCB), heat exchanger, or thermostat may require more frequent repairs. In such cases, a new boiler installation might be a more economical and efficient option.

However, if the boiler is relatively new and still under warranty, it might be worth considering a repair by a Gas Safe registered engineer. They can assess whether replacing certain parts, such as the wiring or circuit board, would suffice.

Factors to Consider

When deciding between repairing or replacing the boiler, take into account the following aspects:

  • Warranty: If the boiler is still under warranty, it may cover the cost of replacement parts or even a new boiler installation.

  • Age of the Boiler: Older boilers may be more susceptible to faults and may prove less energy-efficient. Replacing an outdated boiler with a modern one could result in long-term savings.

  • Extent of the Fault: Determine whether the F7 fault is isolated to a specific component, such as the PCB, or if it's indicative of a more extensive issue with the boiler.

Consulting a Gas Safe Registered Engineer

In any case, consulting a Gas Safe registered engineer should be a priority. These professionals have the expertise to identify the root cause of the F7 fault and determine whether a repair or replacement is the best course of action. Remember that any work conducted on gas appliances must be carried out by a Gas Safe engineer to ensure compliance with safety regulations.

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.

Boiler costs 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 (intended as a 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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Some location factors that can influence the price of your new boiler

You will be given a specific quote from the boiler installation company based on:

  • The type of home you have (i.e. terraced, semi-detached, etc.)

  • How many bedrooms you have

  • How many bathrooms you have

  • Your postcode and specific location

Frequently Asked Questions

What does F7 mean on an Ideal boiler?

F7 error code on an Ideal boiler indicates a problem related to the mains voltage. This could result from an issue in the power supply or a fault within the boiler's components, causing the boiler to malfunction.

What is the fault code F7 on a boiler?

The fault code F7 signifies an issue with the mains voltage, and it is generally displayed when there is an inconsistency in the power supply or faulty electrical components. This error code is not exclusive to Ideal boilers and may appear on various boiler brands.

How do I fix the E7 error on my boiler?

To fix the E7 error on your boiler, first, check if there is a mains voltage problem, and ensure a stable power supply. If the issue persists, seek assistance from a qualified engineer as they can conduct tests to identify faulty components, such as the Printed Circuit Board (PCB), and replace them if necessary.

Are there any common reasons for the Ideal F7 error code?

Common reasons for the Ideal F7 error code include unstable mains voltage, loose electrical connections, or faulty components within the boiler, such as the PCB. It is essential to consult a professional engineer to determine the exact cause and provide a suitable solution.

How do I reset my Ideal boiler?

To reset an Ideal boiler, turn the boiler off using the power switch or control panel button, wait for a few seconds, and then turn the boiler back on. Observe if the boiler resumes its normal operation and if the error code has cleared. If the error code persists, consult a professional engineer for further assistance.

What does F and D mean on my boiler?

The F and D codes on a boiler typically indicate issues relating to the boiler's components. The letter 'F' is often used to denote a fault or error, while 'D' can signify a diagnostic code, helping engineers identify the source of the problem.

What is the FD fault code on Ideal boilers?

The FD fault code on Ideal boilers indicates a 'flame detection' issue. This suggests that the boiler is having difficulty detecting the flame, which could result from a compromised flame sensor, ignition issues, or a problem with gas supply. In such instances, consulting a qualified engineer is advised, as they can diagnose the problem and provide a suitable solution.

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.