50 High

Biasi 50 Fault Code

The Biasi 50 fault code means: your boiler is having trouble talking to your external heating controls or smart thermostat, meaning it cannot receive the correct instructions to heat your home.. It appears on 4 Biasi models 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: OT communication fault.
Typical repair cost £90-180 (including labour)

DIY fix possible

Check that your wall thermostat or smart hub is powered on and has fresh batteries if required.Ensure any wireless receiver boxes plugged into the wall are switched on and showing a green light.Try resetting the boiler by turning the dial to 'Reset' for five seconds and then back to the on position.

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Biasi models that show the 50 fault code

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

Source

Biasi 50 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