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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: January 24, 2024. Updated: May 17, 2024

Vaillant Boiler F22 Error Code – How to fix

Vaillant ecoTEC boiler - F22 Error Code | BoilerhutThe Vaillant boiler F22 error code indicates low water pressure. This is caused by system leaks, component errors, or general ageing.

DIY fixes like pressurising may help. But leaks or component replacements need a Gas Safe professional. Costs will vary based on the issue.

Encountering the F22 fault code on your Vaillant boiler can be concerning. This quick-guide explains the causes, fixes, when to seek professional help and associated costs.

Understanding the F22 error code

  • The F22 code on Vaillant boilers signifies low water pressure, possibly due to leaks, component faults, or natural wear.
  • Correct water pressure is essential for boiler functionality.
  • The error occurs when pressure falls below 0.3 bar.

Addressing low water pressure

  • Leaks are the most common reason for sudden pressure drops.
  • Ageing boilers may experience gradual pressure loss.
  • Faulty components like pressure sensors can cause pressure issues.

DIY solutions for F22 fault

  • Re-pressurising the boiler can fix this issue. To do this, attach the filling loop and open the valves. Close once you reach 1.5 bar on the boiler.
  • Restart the boiler and monitor the pressure.

When to call a professional

  • Boiler leaks require a qualified Gas Safe engineer for repair.
  • Replacing boiler components also necessitates professional Gas Safe engineers.
  • Consider a new boiler if it’s old and repairs are uneconomical.

Costs of professional repairs

  • Hourly rates for Gas Safe engineers vary by region, typically £40 to £80.
  • Repair costs depend on the issue: topping up (£40-£80), fixing leaks (£60-£200), replacing components (£150-£400).
  • Full boiler replacement ranges from £1,950 to £5,000 or more depending on your circumstances.

Boiler warranty

  • Warranties usually cover manufacturing defects, not issues from misuse or other causes.
  • Regular servicing by a Gas Safe engineer is generally required to maintain the warranty.
  • Check with your boiler’s manufacturer if your warranty is active and applicable to the F22 fault.

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

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  • 10 to 12-year warranty on most boilers.
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  • Get up to three quotes for different-tier boilers.
  • Instant, no-obligation quote in less than 1 minute.

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