High
Er on Biasi Advance 25C

Your boiler has entered a lockout state to prevent further damage or safety risks, usually following a failed ignition or a recurring internal error.

Call an engineer soon

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

Technical description

Lock state signaled on the display of the printed circuit board p.c.b.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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