BoilerFaultCodes.com
OFF OFF OFF High Lockout

Your boiler is not receiving any electricity and has completely powered down.

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: No power

What causes this fault?

This fault occurs when the boiler's electrical supply is completely cut off, preventing the control system from functioning. The most common reasons are a tripped circuit breaker in your fuse box, a blown internal fuse on the boiler's circuit board, or a failure of the printed circuit board itself.

Typical repair cost £0-120 (including labour)

DIY fix possible

Check if your home has had a power cut or if a fuse has tripped in your main consumer unit.Ensure the boiler's isolation switch (usually a white fused spur near the boiler) is turned on.Check if your prepaid gas or electricity meter has run out of credit.

Find a Gas Safe engineer

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Protect yourself from future repair bills

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