BoilerFaultCodes.com
F0280 High Lockout

Your boiler's main internal computer has developed a serious fault and is unable to safely control the flame.

Call an engineer soon

Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: The burner control unit is faulty

What causes this fault?

This fault occurs when the boiler's main control board experiences a critical hardware failure or a loss of internal communication. It is typically caused by electrical component degradation over time or a loose connection in the internal wiring that prevents the computer from monitoring the safety of the flame. Because the boiler can no longer verify it is operating safely, it shuts down completely as a protective measure.

Typical repair cost £350-£650 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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