Your boiler has stopped working because the internal fan, which safely removes waste gases, is not spinning at the correct speed.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fan error
What causes this fault?
This fault occurs when the boiler's control board cannot detect that the fan is spinning at the required speed to safely clear exhaust gases. The most common reason is a mechanical failure within the fan motor or a communication issue caused by a damaged wiring harness or a fault on the main circuit board.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like A05 — no call-out fees, no surprises.
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Ferroli Bluehelix Tech is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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