Vaillant F62 Fault Code: What Does It Mean and How to Fix It
The Vaillant F62 fault code means that the flame switch-off was detected with a delay. This happens when the gas valve takes too long to close after the burner is off. Common causes include a defect in your gas valve, PCB issues or an ignition electrode defect.
It is recommended to contact a Gas Safe Register engineer to solve this issue. Additionally, you can try fixing this issue by resetting your boiler.
Let’s discuss the F62 Vaillant fault code and its possible causes in detail so you can understand why it’s displayed on your boiler.
Causes of the F62 Vaillant Fault Explained
It is recommended that you turn off the gas supply even if the boiler has already shut off. After doing this, contact a Gas Safe engineer to solve the problem.
The following are the causes of the F62 Vaillant issue discussed in detail:
Defective Gas Valve
A faulty gas valve can be due to a variety of factors. The internal components that manage gas flow wear out over time. However, it can also occur due to prolonged exposure to heat. This, coupled with consistent opening and closing cycles, causes the gas valves to wear out.
Additionally, there are solenoids, seals, springs, and various moving parts inside the valve that must act quickly when the boiler demands gas or shuts off the flame.
These parts can get stiff over time, corrode, and even lose responsiveness, causing the valve to behave inconsistently when opening and closing.
There can also be electrical issues, such as ineffective solenoids, damage or faulty wiring, or a PCB that cannot send clear signals.
Faulty PCB
The PCB plays a vital role in coordinating and timing the operation of the gas valve and ignition electrode. If the PCB is faulty, having damaged components, loose connections, or distorted signals, it can send inefficient instructions to the gas valve.
A faulty PCB can cause the gas valve to remain open longer than necessary or fail to close in time. This is what causes the delayed flame switch-off, triggering the F-62 fault code.
Sometimes, the PCB can even worsen the gas valve function, making the F62 fault code harder to diagnose.
As the PCB plays a major role in the safe functioning of your Vaillant boiler, any issue must be resolved by a Certified Gas Safe Registered engineer to prevent unexpected failure.
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Damaged Ignition Electrode
An ignition electrode sparks the gas to ignite and maintain a consistent flame. If the electrode is worn, cracked, dirty, or mispositioned, it may fail to produce a strong spark or to detect the flame signal.
This causes the boiler to delay shutting off the flames and misreads the combustion process, leading to the f62 boiler fault. As the F62 fault code is associated with a delayed flame switch-off, any inconsistency in the electrode’s ignition can affect the gas valve issue as well.
A Gas Safe Engineer normally performs tests to assess your electrode’s condition, electrical performance and alignment to check whether this is the issue why an F62 Vaillant fault persists in your boiler.
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How to Fix the Vaillant F62 Fault Code
The Vaillant F62 fault code requires professional attention, and only a Gas Safe Registered Engineer should attempt to fix it. This is because the error is linked to the gas valve, a faulty electrode, and PCB issues.
All of which can cause household damage if you try to fix it yourself. According to Vaillant, only trained professionals should carry out the diagnosing, testing and fixing processes of this F62 fault code.
When you encounter an F62 fault code, it’s important to note that there are other Vaillant Error codes pointing to similar issues. For instance, the F28 fault code is also linked to ignition and gas valve problems, and the F29 fault code similarly indicates issues with the ignition process.
When to Get a New Boiler
It might be time to consider replacing your boiler if these Vaillant boiler fault codes keep reappearing. This indicates that your boiler is near the end of its expected lifespan, and buying a new one is a smart decision, as repair costs will likely exceed the value of keeping the boiler.
Normally, for boilers that are 10-15 years old, a reappearing F62 shows inefficiency and the age of your boiler. A new boiler can improve safety and energy efficiency, bring peace of mind, and minimise the risk of unexpected breakdowns.
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Wrapping Up
The F62 boiler fault indicates a safety risk involving the three major components that support your boiler’s functionality.
The error is associated with significant technical and mechanical issues in the gas valve, PCB, and ignition electrode. A reset to fix the Vaillant F62 fault code might clear the issue temporarily, but until a Gas Safe Engineer resolves the issue, the error will reappear.
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