5P1 High

Ariston 5P1 Fault Code

The Ariston 5P1 fault code means: your boiler is struggling to light properly after several attempts, usually due to an unreliable gas supply or a slightly dirty component.. 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 £100-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Ariston models that show the 5P1 fault code

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

Source

Ariston 5P1 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