E00 to E99 Low

Ariston E00 to E99 Fault Code

Also written as E00TOE99 — same fault.

The Ariston E00 to E99 fault code means: your boiler is displaying a historical log of the last ten faults that have occurred, rather than a single active error code.. It appears on 4 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: This parameter allows the last 10 boiler errors flagged to be displayed, indicating the day, month and year.

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 E00 to E99 fault code

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

Source

Ariston E00 to E99 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