301 High

Ariston 301 Fault Code

The Ariston 301 fault code means: your boiler's main control board has detected a communication error or internal software fault and requires a reset or professional inspection.. It appears on 1 Ariston 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: All Boilers
Typical repair cost £180-450 (including labour)

DIY fix possible

Locate the Reset button on the front control panel.Press and hold the Reset button for 5 seconds.Wait for the boiler to complete its restart sequence.

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Ariston models that show the 301 fault code

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

Source

Ariston 301 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026