701 Medium

Ariston 701 Fault Code

The Ariston 701 fault code means: your boiler has detected a fault with the heating zone 1 flow temperature sensor, which means it cannot accurately monitor the water temperature leaving the boiler.. It appears on 1 Ariston model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: E-Combi EvoE-System EVOClas HE evo combiClas he evo system
Typical repair cost £90-160 (including labour)

Engineer required

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

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Ariston models that show the 701 fault code

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

Source

Ariston 701 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