Wrench symbol flashing Low

Biasi Wrench symbol flashing Fault Code

Also written as WRENCHSYMBOLFLASHING — same fault.

The Biasi Wrench symbol flashing fault code means: your boiler is notifying you that it is due for its regular annual service or scheduled maintenance check-up.. It appears on 2 Biasi models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Maintenance required
Typical repair cost £80-120 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Biasi models that show the Wrench symbol flashing fault code

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

Source

Biasi Wrench symbol flashing 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