Er High

Biasi Er Fault Code

Also written as ER — same fault.

The Biasi Er fault code means: your boiler has entered a lockout state to prevent further damage or safety risks, usually following a failed ignition or a recurring internal error.. It appears on 1 Biasi model in our database.

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.
Typical repair cost £120-350 (including labour)

DIY fix possible

Locate the reset button or selector dial on the front control panel.Press and hold the reset button (or turn the dial to 'R') for at least 5 seconds.Wait for the boiler to attempt to restart; if the code clears and the boiler fires up, monitor it closely.If the code returns immediately or stays on 'Er', do not attempt further resets.

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Biasi models that show the Er fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Biasi Er fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026