Er03+RESET High

Biasi Er03+RESET Fault Code

Also written as ER03RESET — same fault.

The Biasi Er03+RESET fault code means: your boiler has detected a general internal fault that has caused the system to lock out for safety.. 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: Other faults
Typical repair cost £100-280 (including labour)

DIY fix possible

Press and hold the 'Reset' button for 5 seconds to clear the temporary errorCheck that your electricity supply is stable and the boiler fuse hasn't trippedEnsure there is credit on your gas meter (if applicable)

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Biasi models that show the Er03+RESET fault code

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

Source

Biasi Er03+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