How much does it cost to fix Ariston error code 5 P 1?

Typical repair cost for the Ariston 5 P 1 fault is £100-250 including labour.

5 P 1 High

Ariston 5 P 1 Fault Code

Q: What does the Ariston 5 P 1 fault code mean?

Your boiler has failed to start up on its first try and may need a quick manual reset to get it running again.

Also written as 5P1 — same fault.

The Ariston 5 P 1 fault code means: your boiler has failed to start up on its first try and may need a quick manual reset to get it running again.. It appears on 1 Ariston model in our database.

Technical description: First ignition attempt failed

Typical repair cost £100-250 (including labour)

DIY fix possible

Locate the 'Reset' button on the boiler control panel.Press and hold the reset button for 2-3 seconds.Wait a few minutes to see if the boiler initiates a new ignition sequence.

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Ariston models that show the 5 P 1 fault code

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

HS Premium Repair: £100-250

Source

Ariston 5 P 1 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