Is your Vaillant boiler displaying the F62 error code? What does it mean and what can you do to fix the issue?
- What Causes the F62 Fault Code?
- Can I Fix This Error Fault Code Myself?
- Do I Need to Contact a Gas Safe Engineer to Fix the F62 Fault Code?
- Common Causes Of The Vaillant F62 Fault Code
- How Much Will It Cost To Repair The F62 Fault Code?
- Will My Warranty Cover Repairs or Replacement Work for an F62 Fault?
- Do You Need A New Boiler?
Like many boiler manufacturers, Vaillant boilers are equipped with built-in fault codes designed to alert you to any issues and help identify the exact problem.
These codes provide homeowners with a clear starting point to diagnose faults. By consulting the Vaillant manual, you can understand what each code means and explore possible solutions.
While some issues can be resolved with simple DIY fixes, others require the expertise of a Gas Safe registered engineer. But what does Vaillant’s F62 error code indicate, and how should it be addressed? Let’s take a closer look.
Boiler old, unreliable and costing a fortune in repairs? Simply answer these questions, get your fixed price and you could get a new one installed as quick as tomorrow.
Key takeaways:
F62 error code indicates an issue with the gas valve or delay in gas supply.
Common causes include a faulty gas valve or PCB malfunction.
Troubleshooting steps involve checking the gas supply and loose connections.
When to Call a Professional: If the problem persists after troubleshooting, contact a gas safe engineer for further inspection and repair.
In many cases, upgrading your old boiler to a new, more efficient model is the best solution.
Get a new quote (finance available including 0% APR).
What Causes the F62 Fault Code?
The gas valve directs the flow of gas into your Vaillant boiler. Of course, whenever you turn on the heating or require hot water, the boiler will fire up and use this gas supply.
The valve should be closed when the boiler is not in use but open when you require heating or hot water.
If it stays open when your boiler is idle, this comes with a significant risk of a gas leak. And it should be no surprise that a gas leak is incredibly dangerous.
The good news is that boilers like those run by Vaillant are designed to trigger a lockout in the event of a faulty gas valve.
Can I Fix This Error Fault Code Myself?
Before calling a professional, you can try a few simple DIY checks and fixes to potentially resolve the issue:
Inspect the flue for obstructions – Ensure there are no blockages that could be restricting airflow, as this can prevent the boiler from igniting properly.
Verify the gas supply – Check that your home’s gas supply is functioning correctly by testing other gas appliances. If they are working, the issue is likely boiler-specific.
Reset the boiler – Follow the manufacturer’s instructions to perform a reset, which may temporarily resolve the fault and restore heating.
If the fault persists after these steps, professional assistance will likely be required.
Do I Need to Contact a Gas Safe Engineer to Fix the F62 Fault Code?
Yes, it is essential to contact a Gas Safe registered engineer to resolve the F62 fault code. These qualified professionals are legally certified to work on gas boilers and will ensure that any repairs are carried out safely and in compliance with industry regulations.
Attempting to fix complex boiler issues without professional expertise can pose safety risks and may void your boiler warranty.
Common Causes Of The Vaillant F62 Fault Code
If you see the F62 fault code, you should still turn off the gas supply just in case, even if your boiler has already shut itself off.
Once this is done, contact a Gas Safe Registered engineer so that they can address the issue.
Faulty Gas Valve
There is a multitude of potential causes to consider and indeed several causes could be at play that have resulted in your gas valve not opening or/and shutting correctly.
Image showing a standard gas valve
Here are the most common causes of a faulty gas valve:
Faulty PCB
It is entirely possible that the PCB is sending the wrong signals to your boiler’s gas valve.
Image showing a standard PCB
That is to say, your PCB may be asking the gas valve to open and close at the incorrect times.
Obviously, this can lead to gas flowing through the valve when it is not required and vice versa, ultimately leading to an F62.
Related boiler help guides:
Intermittent PCB Connection
It is important the PCB can communicate with the gas valve (and vice versa) on a consistent basis.
If the connection comes and goes, a similar issue can result as with a totally faulty PCB. Again, this would result in an F62 fault code.
Stuck Gas Valve
Another explanation is that your boiler’s gas valve has become stuck. This may happen simply as a result of wear and tear.
If it is stuck, it will be unable to control your boiler’s gas flow correctly, thus causing an F62 fault.
Is your Vaillant boiler experiencing another one of the brand's most common fault codes? We have you covered in our F29 fault code guide.
How Much Will It Cost To Repair The F62 Fault Code?
On average it costs about £30 to £60 per hour to hire a Gas Safe Registered heating engineer.
How long the work will take and whether supply costs would also apply would depend on the nature of the fix.
In addition, if the damage is found, the heat engineer will need to spend time uncovering the extent of the damage and solving any additional issues that are discovered.
For that reason, the costs given below are approximate. It’s possible that replacing the entire boiler will be the best solution but more on that in the next section.
The following cost estimates would apply for different fixes to an F62 error:
Repair work - £30 to £180 for labour costs only.
Replacing a PCB - £300 to £500 including labour and supply costs. *
Replacing a Gas Valve - £150 to £250 including labour and supply costs.
*With these prices, you can see why it may be best to replace your boiler.
Is your Vaillant boiler experiencing some of the brand's most common fault codes? We have many covered many Vaillant boiler error codes in the following guides:
Will My Warranty Cover Repairs or Replacement Work for an F62 Fault?
Vaillant warranties only cover repairs in the scenario that a defect is found that was the result of the manufacturing process.
In other words, if there is a problem with your boiler that resulted from its misuse or is unrelated to its manufacturer, the warranty will not apply.
Moreover, even if a defect may have resulted from its manufacture, you also need to ensure your boiler’s warranty is still valid.
You need to consider how long your boiler is in warranty and whether or not you have followed certain rules as set out in their Ts and Cs. As an example, a Vaillant boiler must be serviced every year by a Gas Safe Registered engineer in order for its warranty to remain valid.
Do You Need A New Boiler?
In some cases, replacing a boiler can make more financial sense than continuing to repair it. Here are the key factors to consider:
Age of the Boiler - If your boiler has surpassed its average lifespan (typically beyond 15 years) and is no longer covered by the manufacturer’s warranty, replacing it may be a more cost-effective option to avoid recurring repair expenses.
Repair Costs - When the cost of repairing the boiler exceeds 50% of the price of a new one, it’s usually more financially sensible to invest in a replacement rather than continuing with costly repairs.
Frequency of Breakdowns - If your boiler is breaking down more frequently, it’s often a sign of significant wear and tear and it is beyond economical repair. In such cases, replacing the boiler can help avoid mounting repair costs and the inconvenience of ongoing issues.
Energy Efficiency - Older boilers tend to be far less efficient than modern models, leading to higher running costs. Upgrading from a G-rated to an A-rated boiler could save you up to £385 per year in energy bills, making replacement a financially smart decision in the long run.
By carefully weighing these factors, you can determine whether replacing your boiler offers better value and peace of mind compared to continued repairs.
Related boiler troubleshooting guides:
Boiler dead? What next? 👻
If you’re aiming to get the best deal on a new boiler, consider getting a quote from us, here’s why:
Gas Safe installation within 24 hours.
Thousands of satisfied customers with an average score of 4.9 on Trustpilot, surpassing the market leader.
Which? Trusted Trader: Heatable is proudly recognised as a Which? Trusted Trader.
Price match guarantee: We will match any like-for-like cheaper quote.
Flexible payment options, including interest-free finance.
Up to 12-year guarantee on selected boilers.
Fixed price guarantee: No hidden costs.
Save your quote and decide later.
Get an instant fixed price on a new boiler, here.
To learn more about boilers, visit our advice section, check out our YouTube channel, or read customer testimonials here.
Heat Happy.
