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Witten by Bernard Morgan (Engineer).
First Published: January 24, 2024. Updated: February 7, 2024

Vaillant F28 Boiler Error/Fault Code – How to fix it

The Vaillant F28 error code indicates an ignition or gas valve issue. This is often caused by:

  • a mechanical fault
  • frozen condensate pipe
  • wiring fault, or
  • low pressure.

Understanding the Vaillant F28 error code is crucial for maintaining your boiler. This quick-guide explains the causes and solutions for this common issue.

What does the Vaillant F28 error code mean

  • Indicates an ignition fault, often related to gas valve issues.
  • Triggered if the boiler fails three ignition attempts.
  • Can lead to a boiler ‘lockout’ to prevent further faults.

Common causes of F28

  • Mechanical fault in the gas valve due to wear and tear.
  • Frozen condensate pipe causing blockages, especially in cold weather.
  • Electrical faults between the gas valve and control unit (PCB).
  • Low boiler pressure due to leaks, open valves, or insufficient water.

Addressing F28 issues

  • Start by trying to thaw a frozen condensate pipe with warm water or a hot water bottle.
  • If trying to thaw the condensate pipe didn’t work, consult a Gas Safe registered engineer.
  • Regular boiler servicing can identify and fix issues early.

Preventative measures

  • Insulate the condensate pipe with outdoor-rated foam pipe insulation.
  • Annual boiler servicing by a qualified engineer helps maintain efficiency.
  • Proactive replacement of ageing boilers can prevent future issues because modern boilers are more robust and efficient than older models.

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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