Is your Vaillant boiler displaying the F62 error code? What does it mean and what can you do to fix the issue?
As with many boiler companies, Vaillant’s boilers feature built-in fault codes.
These codes appear in response to existing issues as a way of making you aware that a) a problem is at hand and b) what the issue is exactly.
With the Vaillant manual, homeowners can find out what each fault code means and look at viable solutions.
Some issues can be solved DIY, while others must be left to a professional. But what about Vaillant’s F62 error code specifically?
But what about Vaillant’s F62 error code in particular?
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This fault code means that a gas valve is faulty. You’ll find that your boiler has also shut itself off when displaying an F62 fault code. This is done primarily for safety reasons.
Note: If you are seeing multiple error codes, it’s possible that there are various co-existing issues. Either way, a professional should be the one to formally diagnose exactly what is going on with your boiler.
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.
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Vaillant F62 fault code fixes
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.
Why is my Boiler’s Gas Valve Faulty?
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.
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.
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.
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.
Can I Fix an F62 Fault DIY?
Given the hazards associated with a faulty gas valve, you must hire a professional to fix an F62 fault for you. Unfortunately, it is simply too dangerous to address DIY.
Furthermore, there is always a risk of incorrectly diagnosing the problem at hand or missing that there are two causes behind the F62 fault.
A qualified professional will be able to identify exactly why your gas valve has failed and fix the present issue(s).
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.
Hiring a Heating Engineer to Fix an F62 Fault
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.
Should I Just Get a New Boiler?
In the event that the PCB needs to be replaced and your boiler is several years old, it might be worth purchasing a new boiler.
If it’s likely you’d have your boiler replaced in the next 3-5 years regardless, why spend some £300 to £500 on a PCB replacement when you could get a new boiler now? Of course, with the current cost of living crisis, this may be a moot point in some cases.
However, you can find good boiler replacement deals in the region of £1,000 to £1,500 and that includes the price of labour. So, we’d recommend keeping an open mind here.
Hopefully, a PCB replacement isn’t needed in the first place! And a gas valve replacement is only about half as expensive as having a PCB replaced so we wouldn’t consider a gas valve replacement as a point at which getting a new boiler necessarily makes more sense even for an older 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.
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