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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: February 7, 2024. Updated: May 17, 2024

F62 Vaillant Fault Code – How to fix

The Vaillant F62 fault code signals a potentially dangerous gas valve malfunction. This will lead to boiler shutdown for safety.

Professional intervention by a Gas Safe registered engineer is required. Boiler replacement might be a more cost-effective solution in cases of significant damage, especially to the PCB.

Understanding F62

The F62 error highlights a fault within the gas valve system. Essentially this stops the boiler’s operation to prevent gas leaks. This automated fault means you should contact a professional to address any potential safety hazard.

Common Causes of F62

Faults may arise from a malfunctioning PCB sending incorrect signals. Or intermittent PCB connections or a stuck gas valve. Each of these issues can disrupt the regular operation of the gas valve, leading to the F62 code.

Professional Assessment and Repair

DIY fixes are not recommended due to the complexities and dangers associated with gas valve repairs. A professional diagnosis is essential. This ensures safety and compliance with regulations.

Cost of Repairs

Hiring a Gas Safe Registered engineer typically costs between £50 and £60 per hour. The total expense is dependent on the nature of the fault and the required repairs. Approximate costs for addressing an F62 error include:

  • Labour for repair work: £50 to £240
  • PCB replacement: £400 to £800 (including parts and labour)
  • Gas valve replacement: £200 to £400 (including parts and labour)

Given these costs, homeowners should carefully consider the age and condition of their boiler. A new boiler cost may be less than repairing your current boiler with parts, labour and call-out charges.

Considering a New Boiler

For older boilers, especially those nearing the end of their expected lifespan, investing in repairs such as PCB replacement may not be economical.

With new boiler installations costing between £2,000 and £3,400, including labour, it may be more sensible to opt for a replacement, especially if long-term performance and reliability are concerns.


The F62 fault code shows a significant issue with your boiler. Understanding its causes, the necessity for professional intervention, and the associated costs can guide homeowners in making the most appropriate decision for their circumstances.

Regular maintenance and timely attention to fault codes can also play a crucial role in extending the life of your boiler and ensuring your home’s safety and comfort.

Unfortunately, your boiler may be unrepairable. If this is the case, get a boiler replacement quote for a premium boiler with Boilerhut:

  • Next day boiler installation.
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  • Instant, no-obligation quote in less than 1 minute.

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