BoilerFaultCodesAriston Limescale Build-up Fault Code
Also written as LIMESCALEBUILDUP — same fault.
The Ariston Limescale Build-up fault code means: your boiler has detected that built-up mineral deposits are preventing your water from heating efficiently, so it has capped the temperature to protect the system from further damage.. It appears on 4 Ariston models in our database.
Technical description: Indirect control (actuated through the regulation of the temperature in the primary heat exchanger) on the formation of limescale in the secondary heat exchanger; temperature is limited to 62°C.
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 Limescale Build-up fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston Limescale Build-up 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 7 July 2026