42 + Medium

Biasi 42 + Fault Code

Also written as 42 — same fault.

The Biasi 42 + fault code means: buttons or touch inputs on your boiler's control panel have become stuck, unresponsive, or have been pressed for too long.. It appears on 4 Biasi models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Keys fault.
Typical repair cost £100-280 (including labour)

DIY fix possible

Turn the boiler power off at the fused spur switch for 30 seconds.Gently wipe the control panel with a dry microfiber cloth to ensure no buttons are physically stuck or obstructed by dirt.Turn the power back on and see if the code clears.

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Biasi models that show the 42 + fault code

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

Source

Biasi 42 + 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