E 16 Low

Ariston E 16 Fault Code

Also written as E16 — same fault.

The Ariston E 16 fault code means: your boiler has lost the signal from the weather sensor installed outside your home, which may cause your heating system to run less efficiently.. It appears on 2 Ariston models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Outdoor sensor short circuit (if fitted)
Typical repair cost £100-200 (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 E 16 fault code

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

Source

Ariston E 16 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 31 August 2026