Er05+ High

Biasi Er05+ Fault Code

Also written as ER05 — same fault.

The Biasi Er05+ fault code means: your boiler has stopped working because the internal fan, which safely clears exhaust fumes, is not running at the correct speed or has lost communication with the main control board.. 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: Faulty fan control system
Typical repair cost £180-£350 (including labour)

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 →

Biasi models that show the Er05+ fault code

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

Source

Biasi Er05+ 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