E03 + RESET High

Biasi E03 + RESET Fault Code

Also written as E03RESET — same fault.

The Biasi E03 + RESET fault code means: your boiler has stopped working safely due to a general lockout, which means the system has detected an error and shut itself down as a precaution.. 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: General lockout
Typical repair cost £100-350 (including labour)

DIY fix possible

Press and hold the RESET button for at least 5 secondsCheck that your gas supply is active (e.g., check other gas appliances or prepay meter credit)Ensure the boiler's pressure gauge is sitting between 1.0 and 1.5 bar

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Biasi models that show the E03 + RESET fault code

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

Source

Biasi E03 + RESET 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